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Replacing worn spark plugs can restore smooth idling, steadier acceleration, and easier cold starts in your Kia Soul. Picking the right spark plug affects fuel economy, throttle response, and long-term ignition system health. This guide lists seven shortlisted spark plugs chosen for compatibility and consistent performance with Kia Soul engines. We evaluated durability and fitment alongside heat range and electrode design to highlight options that are likely to reduce misfires and improve starting behavior. Read on for the specific factors we considered and what matters most when choosing the right spark plugs for your Kia Soul.
Looking for other parts? See all Kia Soul parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | A-Premium Iridium Platinum Spark Plugs, Pack of 4 |  |
| Most Popular A crowd favorite that many people choose with confidence | AEROFORCE 12-Piece 3/8" Drive Spark Plug Socket Set with Extensions and Gapper |  |
| Best Quality Built to a higher standard if you want something more solid | A-Premium Ignition Coil Pack and Iridium Spark Plugs Kit (set of 4) |  |
| Best Budget The cheapest option that still gets the job done reliably | A-NAFTULY Iridium Spark Plugs, 4-Pack (compatible with Kia Soul 1.6L 2012–2019) |  |
| Most Sold A high-volume bestseller chosen again and again | NGK Iridium IX Spark Plug LKR7DIX-11S, 4-Pack |  |
| Best Value for Money The sweet spot between price and what you get | Bosch Double Platinum Fine Wire Spark Plugs (Pack of 4) |  |
| Best Overall The best all-around choice for most situations | BDFHYK Ignition Coil Pack and Iridium Spark Plug Set (4) compatible with Kia Soul 1.6L |  |
1. A-Premium Iridium Platinum Spark Plugs, Pack of 4
| Gap Size | 0.04 Inches |
|---|---|
| Thread Size | 5/8 |
| Compatible with Vehicle Type | Car |
| Core Material | Platinum |
| Top Material Type | Iridium |
These A-Premium spark plugs pair an iridium tip with a platinum core to deliver a longer life and consistent ignition compared with ordinary copper plugs. They are sold as a vehicle-specific four-pack and are intended to replace the factory spark plugs in compatible 1.6L naturally aspirated Kia Soul engines. Installation is straightforward for anyone comfortable with basic engine work and the plugs use a standard 5/8 hex for removal and fitting. The finer iridium tip improves ignitability and can reduce misfires and rough idle, while the platinum core helps the electrode resist wear so service intervals can stretch toward the tens of thousands of miles. Buyers should confirm the exact engine variant and gap before fitting because the set is targeted to specific Soul model years and engine types. Also, replacement coils or other ignition components will still be necessary to fix electrical-related misfires, since plugs alone will not resolve coil faults.
Best for: Reliability-focused owners who prioritize long service intervals and consistent ignition in their Kia Soul 1.6L and want a direct replacement that reduces the need for frequent spark plug changes.
Less Ideal for: Drivers looking for the cheapest short-life replacement or those who need a universal plug for multiple vehicle types should consider other options.
- Iridium tip and platinum core for improved ignitability and extended electrode life
- Sold as a matching four-pack for complete cylinder replacement
- Vehicle-specific fitment aimed at Kia Soul 1.6L applications
- Standard 5/8 hex size makes installation with common tools easy
- Fitment is limited to specific engine variants so confirmation is required before purchase
- Does not address failures caused by ignition coils or wiring
Verdict A practical, longer-lasting factory-style replacement for Kia Soul 1.6L owners who want reliable ignition and extended service intervals.
2. AEROFORCE 12-Piece 3/8" Drive Spark Plug Socket Set with Extensions and Gapper
| Drive size | 3/8" |
|---|---|
| Socket types | Five 6-point and one 12-point |
| Extensions included | 3", 6", 10" |
| Material | Chrome Vanadium Steel |
| Includes | Universal joint and spark plug gap tool |
This AEROFORCE 12-piece set is designed to make spark plug service straightforward for a home mechanic working on a Kia Soul. It includes five 6-point sockets and one 12-point socket plus three extension bars, a universal joint, and a spark plug gap tool so you can reach plugs in tight or angled locations and set gap specifications without extra purchases. The chrome vanadium construction and polished finish resist corrosion for typical garage use, and a silicone retention ring or magnetic insert holds plugs during extraction to reduce the chance of dropping them into the engine. The included storage case and standard 3/8" drive mean the sockets fit common ratchets you likely already own. A few users report the rubber retention insert can wear or lose grip after repeated use, so it may not replace careful handling in very confined spaces. The set covers the common spark plug sizes used on many Kia Soul engines, making it a convenient, all-in-one option for routine plug changes and on-vehicle maintenance.
Best for: Convenience-focused DIYers who want a single, ready-to-use kit that handles typical spark plug jobs without hunting for individual tools; ideal for routine maintenance and at-home plug replacement on a Kia Soul.
Less Ideal for: Professional shops or heavy users who need hardened commercial-grade sockets or who replace spark plugs frequently and require guaranteed long-term retention hardware.
- Complete kit with multiple socket sizes plus extensions and universal joint for accessing hard-to-reach spark plugs
- Silicon retention ring and magnetic option help hold plugs during removal to reduce drops
- Made from chrome vanadium steel with polished finish for corrosion resistance and durability
- Standard 3/8" drive fits common ratchets so no special tools required
- Some users report the rubber retention insert can wear or fail after several uses
- Includes a 12-point socket which is useful in tight spaces but provides less torque capacity than 6-point sockets
Verdict A convenient, full-featured spark plug socket kit that covers the common sizes and access needs for Kia Soul maintenance, with the occasional durability limit in the retention insert.
3. A-Premium Ignition Coil Pack and Iridium Spark Plugs Kit (set of 4)
| Compatible with Vehicle Type | Car |
|---|---|
| Part Interchange Info | Equivalent to UF651, 273002E000, C1804, 97390, LKR7BGPS |
| Connector Gender | Male |
| Coil Terminal Quantity | 2 |
| Primary Resistance(ohms) | 0.77 |
This kit pairs four 2-pin ignition coil packs with iridium spark plugs intended as a bolt-on replacement for 2.0L Kia Soul engines. Installation is plug-and-play for the accessible front-mounted coils on Soul engines and most DIYers can change the whole set in under 30 minutes with basic tools. The iridium plugs are said to extend service life and improve idle stability and starting compared with standard nickel plugs, while the matched coils restore consistent spark and clear misfire codes. Practical benefits include replacing all cylinders at once to eliminate intermittent misfires, smoother throttle response, and improved drivability. Limits to expect are typical for aftermarket ignition parts: long-term durability may vary compared with higher-priced factory-quality units, and the kit uses a two-terminal blade connector which is specific to certain model years and must match your Soul’s harness. The set comes with a one-year parts guarantee covering the item itself but not installation or labor costs.
Best for: Performance-oriented owners who want a cost-effective way to restore strong, consistent spark and improve throttle response on a Kia Soul 2.0L through a full-cylinder ignition refresh.
Less Ideal for: Drivers who prioritize longest-possible service life or who prefer dealer-sourced factory-quality parts should consider higher-end or OEM options instead.
- Complete kit includes four matched coil packs and iridium plugs for a full-cylinder refresh
- Iridium central electrode for plugs improves starting, idle stability, and expected service life
- Bolt-on, plug-in installation designed for front-facing, easily accessible coils on the Soul
- Clears misfire codes and restores smoother throttle response when coils or plugs are failing
- Aftermarket construction means longevity may not match higher-end factory-quality replacements
- Kit fitment requires matching the two-pin blade connector and 2.0L Soul engine years
Verdict A practical, performance-minded kit that restores spark and drivability on 2.0L Kia Soul engines at a significantly lower cost than many factory replacements.
4. A-NAFTULY Iridium Spark Plugs, 4-Pack (compatible with Kia Soul 1.6L 2012–2019)
| Compatible with Vehicle Type | Car |
|---|---|
| Automotive Fit Type | Vehicle Specific Fit |
| Gap Size | 0.04 Inches |
| Core Material | Iridium |
These A-NAFTULY iridium spark plugs are sold as a four-pack replacement for the Kia Soul 1.6L (naturally aspirated) engines and are meant for routine tune-ups. They use a fine-wire iridium center electrode with laser-welded construction, which in practice provides a more consistent spark and longer life than basic copper or standard platinum plugs. The kit arrives with factory-style thread size and a nominal gap of about 0.04 inches but reviewers note plugs can arrive with slightly different gaps so checking and adjusting to your Soul's specification before installation is recommended. For a budget-focused shopper you get the fuel-efficiency and longevity advantages of iridium at a lower price point than dealer-branded replacements. The trade-offs are that these are an aftermarket value option rather than a factory-branded part and some units may require re-gapping out of the box, which adds a small step during installation. When fitted correctly they deliver smoother idle and reliable performance for everyday driving.
Best for: Budget-conscious Kia Soul owners who prioritize lower cost per tune-up while still wanting the longer life and efficiency benefits of iridium plugs for daily driving.
Less Ideal for: Drivers seeking an exact factory-branded replacement or those unwilling to check and adjust plug gap during installation should consider other options.
- Iridium fine-wire center electrode for improved durability and a consistent spark
- Laser-welded construction intended to extend service life compared with basic plugs
- Vehicle-specific fit for Kia Soul 1.6L models, sold as a complete 4-pack
- Generally reported to improve idle smoothness and fuel efficiency in real-world use
- Plugs may arrive with varying gap sizes and often require checking and re-gapping before installation
- Aftermarket value part rather than factory-branded replacement, which may concern some buyers
Verdict A cost-conscious aftermarket way to get iridium plug longevity and smoother running for the Kia Soul 1.6L, but check and set the gaps before installation.
5. NGK Iridium IX Spark Plug LKR7DIX-11S, 4-Pack
| Core Material | Iridium |
|---|---|
| Thread Size | 5/8 inch |
| Vehicle Service Type | Car, Truck |
| Position | Front, Rear |
These NGK Iridium IX spark plugs are designed to deliver stronger, more consistent sparks than standard plugs by using a 0.6 mm iridium tip and a tapered ground electrode. They are typically used as a direct replacement when routine maintenance or a performance-oriented upgrade is needed. Notable features include the fine iridium center electrode for durability, corrugated insulator ribs to reduce flashover, and a triple gasket seal to prevent combustion leaks. In practice that means easier starting, a steadier idle, and potentially crisper throttle response compared with older copper or nickel plugs. Installation is straightforward with a spark plug socket and the plugs come pre-gapped, though some owners recommend checking the gap before fitting. Limitations are that iridium plugs cost more than basic replacements and benefits are most noticeable on higher-efficiency or tuned engines rather than on low-demand city driving. For a conservative Kia Soul owner wanting a reliable, longer-lasting factory-quality replacement, these are a sensible choice.
Best for: Risk-averse mainstream buyers who prioritize dependable, factory-quality replacements and longer service intervals for everyday driving and occasional highway use in a Kia Soul.
Less Ideal for: Buyers seeking the lowest possible upfront cost or those with heavily modified engines chasing maximum power gains should consider other options.
- Fine 0.6 mm iridium tip for prolonged electrode life and consistent spark
- Corrugated insulator and triple gasket reduce misfires and combustion gas leakage
- Pre-gapped and comes with protective sleeve to prevent shipping damage
- Designed for vehicle-specific fit which simplifies direct replacement
- Higher upfront cost compared with standard copper or nickel plugs
- Some units may arrive with a gap that should be verified before installation
Verdict A durable, vehicle-specific iridium replacement that gives Kia Soul owners a reliable, longer-lasting spark plug over standard options.
6. Bosch Double Platinum Fine Wire Spark Plugs (Pack of 4)
| Core Material | Platinum |
|---|---|
| Thread Size | 14 |
| Vehicle Service Type | Car, SUV, Truck |
| Position | Front, Rear |
These Bosch double platinum fine wire spark plugs are a factory-quality replacement set intended to restore or maintain ignition performance. They use a fine wire center electrode with a platinum firing pin and a platinum inlay on the ground electrode to reduce gap erosion and deliver longer life than standard copper plugs. Installed in place of worn plugs, they are pre-gapped and feature nickel-plated rolled threads so you can install them without anti-seize. In normal use they improve ignitability and can help smooth idle and throttle response while stretching time between changes. The plugs meet manufacturer design requirements for fit and function but fitment is engine-dependent so verify they match the Kia Soul engine application before purchase. Expect reliable, low-maintenance service from a reputable brand, though some vehicles may require a different length or part number for proper seating and reach.
Best for: Practical optimizers who prioritize dependable, low-maintenance parts that restore engine performance without overspending and prefer proven brand reliability.
Less Ideal for: Drivers chasing maximum longevity or marginal performance gains who should consider premium iridium plugs instead, or owners unsure about engine-specific fit who need an exact part number match first.
- Double platinum electrodes and fine wire center improve ignitability and reduce gap erosion for longer service life.
- Pre-gapped at the factory and nickel-plated rolled threads simplify installation without anti-seize.
- Designed to meet manufacturer fit, form, and function for modern gasoline engines.
- Pack of four covers a full-cylinder service for 4-cylinder engines commonly found in the Kia Soul.
- Fitment can be engine-specific; incorrect length or reach on some engines may prevent proper seating.
- Not the highest-end iridium option for drivers seeking maximum longevity or marginal performance gains.
Verdict A reliable, easy-to-install double-platinum replacement that balances improved ignitability and longer life for budget-minded Kia Soul owners, provided you confirm correct engine fitment.
7. BDFHYK Ignition Coil Pack and Iridium Spark Plug Set (4) compatible with Kia Soul 1.6L
| Compatible engines | Kia Soul 2012-2019 1.6L |
|---|---|
| Part interchange numbers | UF652, 93815, 5C1860, 273012B100 |
| Connector gender | Female |
| Included components | Coil pack set with spark plugs (4 count) |
This BDFHYK kit bundles four ignition coil packs with matching iridium spark plugs intended as a direct replacement for Kia Soul 1.6L engines from 2012 through 2019. It is designed for a straightforward plug-in installation and is typically used when rough idle, misfires, slow acceleration, or high fuel use indicate worn coils or plugs. The coils use silicon steel cores and coated winding to improve longevity while the iridium plugs promise better spark consistency and quicker starts compared with generic copper plugs. In real-world use the set restores smooth idle and throttle response when the original ignition components are aged, and many users report easy fitment and reliable performance after installation. Expect the benefit of a complete four-cylinder refresh in one purchase, but be aware that one reviewer reported a defective coil in a small number of units, so inspect parts before install. The kit aims for factory-quality fit and serviceable lifespan rather than high-end performance gains, making it a practical maintenance upgrade for owners who want a full ignition refresh in one go.
Best for: Balanced, practical owners who want a single-purchase, factory-replacement ignition refresh for a Kia Soul 1.6L and value reliability and ease of installation.
Less Ideal for: Enthusiasts seeking high-performance ignition upgrades or anyone needing parts for vehicles other than the Kia Soul 1.6L should look elsewhere.
- Complete four-cylinder kit includes ignition coils and iridium spark plugs for a single service job
- Designed for plug-in installation to match factory connections and simplify replacement
- Iridium electrodes offer more consistent spark and improved starting over older copper-style plugs
- Multiple customer reports of good fit and restored engine smoothness on Kia Soul 1.6L
- A small number of users reported at least one defective coil in a set, so initial inspection is recommended
- Not marketed as a performance upgrade beyond restoring factory-level operation
Verdict A convenient, balanced replacement kit that refreshes all four cylinders on Kia Soul 1.6L models with factory-fit plugs and coils, but inspect parts on arrival for defects.
Choosing the Right Kia Soul Spark Plug: Key Factors to Consider
Fitment and Compatibility
Correct fitment is the first priority because the wrong physical size or thread specification will not install properly and can damage the engine. Confirming thread length, hex size, and seat type matters to ensure a correct seal and proper reach into the combustion chamber.
Compatibility also ties to engine-specific requirements such as resistor vs non-resistor designs and whether the plug clears surrounding components. Choosing a plug specified for your Kia Soul engine prevents installation issues and helps maintain reliable spark delivery.
Electrode Material and Construction
Electrode composition affects durability and spark quality. Iridium and platinum tips generally offer longer service intervals and more consistent spark performance compared with standard copper cores, which wear faster.
Construction details like single vs multiple ground electrodes, tapered vs flat electrodes, and center electrode thickness influence ignition energy concentration and how the spark interacts with combustion. These factors affect throttle response and consistent firing under varied driving conditions.
Heat Range and Thermal Management
Heat range determines how quickly a plug transfers heat from the firing tip to the cylinder head. Choosing the correct heat range helps avoid fouling from a plug that runs too cold or pre-ignition and detonation risks from a plug that runs too hot.
Match the plug heat range to your engine's operating characteristics and driving style. Consider factory recommendations and real-world conditions like frequent short trips or highway driving when assessing which heat range will keep the plug within its optimal temperature window.
Spark Plug Gap and Setup
Gap size controls the distance the spark must jump and directly influences ignition reliability. A properly set gap ensures consistent combustion and reduces the chance of misfires, especially under load.
Some plugs come pre-gapped but may still need adjustment after shipment or during installation. Check the Kia Soul service specifications for gap values and confirm the plug you choose can be safely gapped without damaging the electrode.
Durability and Service Interval
Plugs that last longer reduce maintenance frequency and lower the chance of intermittent misfires as parts age. Durability is tied to electrode material, protective coatings, and how well the plug resists corrosion and electrode erosion.
Consider the expected service interval when planning routine maintenance. Longer-life plugs can be advantageous for drivers who prefer extended intervals between tune-ups, while others may prioritize initial performance over ultimate longevity.
Cold-Start and Misfire Resistance
Cold-start behavior is often the first sign of spark plug issues, so choose plugs known to perform reliably during engine warm-up. Resistance to fouling and stable firing at low temperatures reduces rough idle and start hesitation.
Also weigh a plug's tendency to produce consistent sparks under variable loads to minimize engine misfire symptoms. Plugs that maintain stable ignition across temperature ranges help preserve drivability and emission control system function.
FAQ
How often should I replace spark plugs in a Kia Soul?
Replacement intervals vary by plug type and driving conditions. Copper plugs generally need replacement more often, while iridium or platinum types often last longer. Check your vehicle maintenance schedule and inspect for wear or fouling if you experience rough idle, hard starting, or reduced fuel economy.
What are common spark plug symptoms to watch for in my Kia Soul?
Signs include rough idling, reduced acceleration, increased fuel consumption, engine misfires, and difficulty starting, especially in cold weather. Any of these symptoms can indicate worn or fouled plugs, ignition system issues, or fuel delivery problems, so investigate promptly.
Can I re-gap spark plugs myself while replacing them?
Many spark plugs arrive pre-gapped but may need minor adjustment to match Kia Soul specifications. You can re-gap plugs with the proper feeler gauge and a delicate tool to avoid damaging the tip. Follow the service manual for gap values and handle electrodes carefully to preserve material coatings.
Does spark plug heat range matter for everyday driving?
Yes, heat range affects how the plug handles combustion heat and fouling. For typical city and highway use, sticking close to manufacturer-recommended heat ranges is safest. Different driving patterns, like extended idling or towing, can justify choosing a slightly different heat range to keep the plug in its optimal temperature window.
Will a misfiring cylinder always mean the spark plug is bad?
Not always. Misfires can stem from ignition coils, fuel delivery issues, vacuum leaks, or compression problems as well as spark plugs. Spark plugs are a common cause, so inspect them first, but be prepared to check other ignition and fuel system components if problems persist.
How We Chose the Best Kia Soul Spark Plug
We focused on criteria that matter specifically for spark plugs used in Kia Soul engines. Primary filters included confirmed fitment for Kia Soul engine variants, electrode material and construction, and heat range suitability to ensure proper combustion under typical driving conditions. We also evaluated longevity indicators such as manufacturer-specified service interval expectations and corrosion-resistant finishes that affect lifespan. Additional considerations were spark plug gap specifications and how easily the gap can be set or maintained, plus reliability reports related to cold-start performance and tendency to cause engine misfires. We excluded any items that lacked clear fitment information for Kia Soul models or that used unclear materials or unspecified heat ranges. The final list favors plugs that balance durability, ignition stability, and correct thermal handling for the Kia Soul platform.
Our full evaluation process is outlined in our review methodology.
Conclusion
Prioritize correct fitment, appropriate heat range, and electrode material when choosing spark plugs for your Kia Soul. These factors have the biggest impact on ignition reliability, cold-start performance, and service life. Balance durability against your maintenance preferences and driving conditions. If you often experience cold starts or frequent short trips, favor plugs that resist fouling and maintain stable sparks. For longer service intervals, choose a well-constructed plug with a suitable heat range and robust electrode material.
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