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If your 2012-2016 Subaru Impreza is showing dimming lights, slow cranks, or frequent battery issues, the alternator is a likely culprit. Replacing the alternator restores proper charging, prevents repeated dead batteries, and keeps electrical systems functioning while you drive. This guide covers the top shortlisted alternators chosen for this Impreza range and explains the criteria that matter for fitment, output, and longevity. You will find clear information on compatibility, expected output ratings, and serviceability to help you decide which option suits your driving and maintenance needs. Read on for what we examined and why these alternators made the list.
Looking for other parts? See all Subaru Impreza parts & accessories.
Top Picks at a Glance
| Best Quality Built to a higher standard if you want something more solid | AISIN Aftermarket Alternator ALTF-00640 for Subaru 2.0L H4 (130A) |  |
| Best Value The sweet spot between price and what you get | Valeo 501796 Alternator for 2012–2014 Subaru Impreza |  |
| Best Budget The cheapest option that still gets the job done reliably | SB Parts 110A Replacement Alternator for Subaru Impreza / XV Crosstrek 2.0L (2012-2014) |  |
| Highest Rated A top-rated pick with lots of positive feedback | Parts Player 110A Alternator for Subaru Impreza 2.0L (2012–2014) |  |
| Most Popular A crowd favorite that many people choose with confidence | SB Parts 130A Replacement Alternator for Subaru 2.0L (SB11869oe) |  |
1. AISIN Aftermarket Alternator ALTF-00640 for Subaru 2.0L H4 (130A)
| Amperage | 130A |
|---|---|
| Voltage | 12V |
| Rotation | Counterclockwise |
| Groove Quantity | 6 |
This Aisin alternator is a direct-replacement, vehicle-specific unit made to fit 2.0L H4 Subaru applications. It delivers 130 amps at 12 volts with counterclockwise rotation and a six-groove pulley, so it supplies solid charging capacity for higher electrical loads common to performance builds with upgraded audio, lighting, or engine management. Built with aluminum housing for improved heat dissipation, it is positioned to resist heat-related performance loss during extended driving or spirited use. Installation is intended to be plug-and-play and includes an instruction manual, which simplifies swapping the unit into compatible Impreza, Crosstrek, and WRX models. Practical limitations are that this is a like-for-like replacement rather than a high-output performance unit beyond 130A, so builders needing significantly more charging capacity will need a dedicated high-output alternator or custom solution. Fitment is vehicle-specific, so verify the referenced Subaru part numbers against your car before purchasing.
Best for: Buyers who want a reliable, factory-style replacement that restores charging capacity for 2.0L Subaru cars while supporting modest performance electrical upgrades.
Less Ideal for: Drivers planning extensive electrical modifications or race-focused builds that require substantially more than 130A should consider purpose-built high-output alternators instead.
- Direct vehicle-specific fit for select Subaru 2.0L H4 models for straightforward replacement.
- 130A output supports common performance electrical upgrades and modern accessory loads.
- Aluminum housing promotes heat resistance and faster cooling for sustained operation.
- Designed for plug-and-play installation with an included manual to simplify swap-out.
- 130A rating is not a high-output upgrade for heavily modified vehicles that demand much higher charging capacity.
Verdict: Choose this Aisin 130A direct-fit alternator when you need a dependable, factory-quality replacement that supports typical performance electrical upgrades on 2.0L Subaru models.
2. Valeo 501796 Alternator for 2012–2014 Subaru Impreza
| Manufacturer | Valeo |
|---|---|
| Model | 501796 |
| Exterior | Machined |
| Item Weight | 13.06 pounds |
The Valeo 501796 is a direct-fit replacement alternator built as a brand-new unit rather than a remanufacture. It uses premium rare earth magnets to boost charging efficiency without increasing size, and Valeo states each unit is tested extensively for thermal, vibration, and electrical endurance. In typical use it replaces the factory alternator to restore reliable charging for the battery and vehicle electronics, helping prevent dimming lights, slow starts, and accessory issues. The machined exterior and claimed resistance to heat, vibration, and contaminants speak to durability for daily driving and variable conditions. Because it is designed for OE-style fitment the install should be straightforward for a professional or experienced DIYer who follows vehicle-specific instructions. The main limitations are that fitment is listed for 2012–2014 Impreza in the title so buyers with 2015–2016 models should verify compatibility, and the listing does not include detailed amperage or connector pinouts which technicians may need to confirm before purchase.
Best for: Buyers who want a reliable, direct-fit replacement that restores charging performance with factory-quality construction and long-term durability in everyday use.
Less Ideal for: Shoppers needing explicit electrical specifications or exact connector details for custom installs or those with Impreza model years outside the 2012–2014 range should consider alternatives or verify fitment first.
- 100% new unit not remanufactured for predictable service life
- Designed for factory-quality direct fitment to simplify installation
- Higher charging output using rare earth magnets improves electrical system performance
- Extensive thermal and vibration testing suggests strong durability
- Specification details such as output amperage and connector pinout are not listed in the product description
Verdict: Choose the Valeo 501796 when you want a brand-new, factory-quality alternator that restores charging performance with proven durability for 2012–2014 Impreza models.
3. SB Parts 110A Replacement Alternator for Subaru Impreza / XV Crosstrek 2.0L (2012-2014)
| Amperage | 110 |
|---|---|
| Rotation | CW |
| Pulley Design | S6 |
| Fitment | Subaru Impreza / XV Crosstrek 2.0L 2012-2014 |
This SB Parts alternator is a direct-replacement style unit rated at 110 amps for 2.0L Subaru Impreza and XV Crosstrek model years listed. It supplies charging and electrical power for the vehicle and installs in place of the factory unit using the existing wiring and pulley orientation. Notable features include a clockwise rotation, S6-style pulley design, and a 1-year warranty. For day-to-day driving it should restore charging performance for a car with worn or failing original alternator and handle typical accessory loads like lights, audio, and charging small electronics. The 110-amp output is adequate for stock-equipped cars but may be marginal if you have high-draw aftermarket accessories. Fitment is vehicle- and engine-specific so confirm the year, make, model, and 2.0L H4 engine before buying. Buyers trading down to a budget replacement will appreciate the straightforward swap-in design, while those wanting higher-output or heavy-duty duty-cycle units should look elsewhere.
Best for: Buyers looking for an affordable, straightforward replacement to restore charging on a 2.0L Subaru Impreza or XV Crosstrek without adding high-draw accessories.
Less Ideal for: Drivers who run powerful audio systems, additional lighting, or heavy electrical accessories that require a higher-output or heavy-duty alternator.
- 110-amp output suitable for restoring factory charging on stock 2.0L Subaru setups
- Direct-replacement design with clockwise rotation and matching S6 pulley pattern for easier swap-in
- Includes a 1-year warranty for basic post-purchase protection
- 110 amps may be insufficient for vehicles with significant aftermarket electrical loads
- Limited to the specified Subaru 2.0L years and engine configuration so not universally compatible
Verdict: A budget-friendly, vehicle-specific 110A replacement that gets stock 2.0L Subaru Impreza and XV Crosstrek charging systems back to working order.
4. Parts Player 110A Alternator for Subaru Impreza 2.0L (2012–2014)
| Amperage | 110 A |
|---|---|
| Voltage | 12 volts |
| Rotation | CW (clockwise) |
| Pulley class | S6 |
| Regulator/Fan | IR/IF |
This Parts Player alternator is a direct-fit replacement built to restore charging system performance on Subaru Impreza and XV Crosstrek 2.0L models from 2012 to 2014. It supplies 110 amps at 12 volts with a clockwise rotation and factory-style S6 pulley, and it uses the IR/IF regulator/fan configuration and factory plug orientation for a straightforward swap. Typical use is replacing a worn or failed alternator to regain battery charging, proper electrical function, and reliable starts. The machined exterior and included pulley class match factory characteristics, which helps with belt alignment and accessory operation. It does not include mounting hardware, so plan to reuse or source bolts and the B+ right-angle adapter as noted. Because it is a vehicle-specific replacement, installation is simple for a DIYer with basic tools or a technician, and it returns OEM-like charging capacity for daily driving. Buyers should confirm plug code and mounting details against their car before ordering to avoid fitment surprises.
Best for: Buyers who prioritize a dependable, factory-compatible replacement to restore charging performance on a 2012–2014 Subaru Impreza or XV Crosstrek and want a straightforward swap with OEM-like behavior.
Less Ideal for: Those upgrading electrical capacity for heavy aftermarket accessories or owners of Subaru models outside the stated 2012–2014 2.0L scope should look for a higher-output or different-fit alternator.
- Direct-fit design for specified Subaru Impreza and XV Crosstrek 2.0L years, simplifying installation
- 110 amp output matches common charging needs for stock electrical loads
- Factory-style S6 pulley and clockwise rotation preserves belt alignment and accessory operation
- Machined exterior and factory regulator configuration support reliable, OEM-like performance
- Mounting hardware is not included so additional parts or reuse of originals may be needed
Verdict: A vehicle-specific 110A replacement that restores factory-style charging for 2012–2014 Subaru Impreza and XV Crosstrek 2.0L owners seeking reliable, OEM-like performance.
5. SB Parts 130A Replacement Alternator for Subaru 2.0L (SB11869oe)
| Amperage | 130 A |
|---|---|
| Rotation | CW |
| Pulley | SD6 |
| Compatible engines | H4 2.0L |
This SB Parts alternator is a direct-replacement unit rated at 130 amps with clockwise rotation and an SD6 pulley, intended for 2.0L Subaru models in the specified year range. It installs like a factory replacement and supplies charging capacity suitable for stock electrical systems and modest accessory loads. Notable features include the stated amperage rating, pulley type, and a fitment list that targets Impreza 2015–2016, WRX 2015–2021, and Crosstrek 2015 with the H4 2.0L engine. In practice this means it should restore battery charging and electrical stability after a failed alternator with minimal modification when the vehicle matches the listed fitment. Limitations are that compatibility is limited to the exact engine and year combinations the seller specifies and the product information does not provide detailed internal components or long-term durability data; some buyers may prefer a brand with longer track record or more specification details. The unit comes with a one-year warranty per the description which offers basic peace of mind for early failures.
Best for: Buyers who want a direct replacement alternator that matches factory rotation and pulley type and who prioritize restoring reliable charging on the specified Subaru 2.0L models with minimal fuss.
Less Ideal for: Shoppers seeking a high‑output unit for heavy aftermarket electrical setups or those who want a long-proven brand with extensive specification and longevity testing.
- 130 amp rating suitable for stock charging and typical accessory loads
- Designed to match factory rotation and pulley type for straightforward installation
- Fitment list targets specific Subaru 2.0L models to reduce guessing about compatibility
- Includes a one-year warranty for basic coverage against early defects
- Fitment is limited to the exact engine and model years listed so it is not a universal Subaru alternator
- Manufacturer documentation lacks in-depth component or testing details for long-term reliability assessment
Verdict: Choose this SB Parts 130A alternator if you need a straightforward, factory-style replacement for the listed Subaru 2.0L model years to restore charging without modification.
Choosing the Right 2012-2016 Subaru Impreza Alternator: Key Factors to Consider
Fitment and Mounting
Accurate fitment is the foundation of a successful alternator replacement for the 2012-2016 Subaru Impreza. The alternator must match the Impreza's mounting point locations, bolt hole pattern, and pulley alignment to avoid belt misalignment and premature wear.
Different Impreza engines and accessory configurations may use an internally or externally regulated alternator and might have variations in connector type. Choosing an alternator with correct electrical connectors and plug orientation eliminates the need for splicing or adapter harnesses. Improper fitment can also affect tensioner alignment and ultimately cause serpentine belt noise or failure.
Rated Output and Electrical Capacity
Alternator amperage rating determines how well the charging system supports batteries and electrical accessories. For the 2012-2016 Subaru Impreza, consider the stock output and any additional loads such as aftermarket audio, lighting, or heated accessories.
Selecting an alternator with insufficient amperage leads to undercharging and repeated battery cycling. Conversely, overspecifying output can be fine if the alternator is mechanically compatible, but be mindful of charging system voltage regulation and heat dissipation requirements.
Regulation and Voltage Stability
A stable voltage regulator keeps charging voltage within safe limits for the battery and vehicle electronics. Voltage that runs too high shortens battery life and can damage sensitive modules, while low voltage causes poor battery maintenance and erratic electrical behavior.
Some alternators use integrated electronic regulators with tighter control; others rely on externally mounted regulators. For the Impreza, choose a unit with a reliable regulator and clear specification of operating voltage range to ensure consistent performance across temperature and load conditions.
Build Quality and Components
Durable bearings, quality diodes, and robust housings contribute to an alternator's service life. Alternators in daily-driven Imprezas are exposed to road grime, moisture, and heat cycles, so corrosion-resistant finishes and sealed bearings improve longevity.
Brush construction and the ease of replacing wear items affect long-term maintenance. An alternator built with higher grade internal components tends to run quieter, resist belt dust contamination, and provide stable output for more miles.
Serviceability and Rebuild Options
Being able to service an alternator extends its useful life and reduces long-term ownership cost. For the 2012-2016 Subaru Impreza, consider alternators that allow brush, diode, or regulator replacement and those compatible with rebuild kits.
Serviceable designs often save money compared with full assembly swaps, especially if the pulley or housing is still in good condition. Check whether common replacement parts are available and whether the design uses press-fit or bolted components to determine how straightforward repairs will be.
Warranty and Support
Warranty length and coverage indicate the manufacturer's confidence in the alternator and provide protection if early failures occur. For vehicle owners who rely on their Impreza daily, longer warranty periods reduce risk and may include free replacement or repair support.
Also factor in the clarity of warranty terms, what is excluded, and how claims are handled. Units with limited or unclear warranty language add uncertainty, whereas transparent coverage makes a replacement decision easier.
Common Alternator Symptoms on a 2012-2016 Impreza
Recognizing symptoms early helps avoid being stranded. Typical signs include dimming headlights at idle, the battery warning lamp on the dash, slow engine cranking, and intermittent electrical failures. These symptoms often worsen when accessories are used, such as the heater blower or windshield defroster.
You may also notice unusual noises from the front of the engine bay such as whining or grinding that point to failing bearings inside the alternator. Visual inspection for oil contamination or damaged connectors can reveal issues before they become critical.
- Dimming or flickering interior and exterior lights
- Battery warning light or error messages
- Slow or labored engine starts
- Strange front-end noises under varying RPM
Testing and Diagnosing Alternator Issues
Basic testing starts with measuring battery voltage at rest and with the engine running. A healthy charging system typically shows slightly above battery resting voltage with the engine on. Load testing under accessory load and at varied RPM helps confirm if the alternator maintains voltage under demand.
If you are hand-tool savvy, checking connector voltage, inspecting the drive belt tension, and observing charging behavior as accessories toggle on will narrow down the cause. For more certainty, bench testing or professional diagnostic tools can evaluate diodes and regulator function.
- Measure resting voltage and running voltage
- Test under accessory load and at higher RPM
- Inspect belt condition and pulley alignment
- Consider diode/regulator bench testing if symptoms persist
Installation Considerations for the Impreza
Installing an alternator on the 2012-2016 Impreza requires attention to belt routing, proper torque on mounting bolts, and ensuring the electrical connector is seated fully. Using correct torque values prevents distortion of the housing and maintains alignment between pulley and belt.
If the vehicle has a tensioner-style belt, relieve tension carefully and inspect the belt and tensioner for wear. Replace worn belts during alternator service to avoid premature failure. If you plan to handle installation yourself, gather the proper sockets and a torque wrench, and follow safe battery disconnect procedures before starting.
- Disconnect negative battery terminal before work
- Verify belt and tensioner condition, replace if needed
- Use correct bolt torque and check pulley alignment
- Ensure connector pins are clean and corrosion-free
When to Consider a Rebuild Vs Full Replacement
A rebuild can be cost-effective if the alternator housing and pulley are in good condition and the failure is due to brushes, diodes, or the regulator. For owners comfortable with mechanical work, replacing wear parts can restore function at a lower material cost.
Full replacement is preferable when the housing is damaged, bearings have failed, or if long-term reliability and warranty coverage are top priorities. Consider local availability of rebuild kits and the labor time involved when choosing between these options.
- Rebuild if internal wear parts are the only failures
- Replace if housing, pulley, or bearings are compromised
- Assess cost of parts plus labor when deciding
Estimating Installation and Ownership Costs
Ownership costs include the unit, potential rebuild parts, and labor for installation. Labor times vary based on engine layout and accessory removal requirements. Budgeting for a new belt and any small hardware or seal replacements avoids multiple shop visits.
Warranty coverage can offset unexpected early failures, so compare terms as part of your ownership-cost calculation. If you plan to DIY, ensure you are comfortable with the required lifting, battery disconnection, and tensioner work.
- Account for belt replacement and mounting hardware
- Compare warranty coverage as part of ownership cost
- Factor in labor time or DIY effort when planning
Still looking for the perfect fit?
Select your Subaru Impreza configuration to see the most relevant Alternators recommendations
How We Chose the Best 2012-2016 Subaru Impreza Alternator
We shortlisted alternators for the 2012-2016 Subaru Impreza using a focused set of vehicle-specific evaluation criteria. First, fitment accuracy was essential: we verified mounting points, pulley type, and electrical connector compatibility for the Impreza engine and model years. Second, rated electrical output and amperage curves were evaluated because correct charging capacity affects battery health and accessory performance. Third, build quality and component choices such as bearings, brushes, and regulator type were considered to gauge long-term reliability. Fourth, serviceability mattered: designs that allow brush or diode replacement, or that pair with available rebuild kits, scored higher. Fifth, warranty terms and manufacturer support were weighed as an indicator of confidence and risk mitigation.We excluded units that required nonstandard modifications or offered unclear fitment without chassis-specific adapters. Units lacking clear technical specs or without reasonable warranty coverage were also filtered out. The result is a list focused on direct-fit and serviceable alternators that meet the charging demands and installation realities of the 2012-2016 Subaru Impreza.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my Impreza alternator is failing or the battery is the problem?
Start by measuring battery voltage with the engine off and then with the engine running. A healthy alternator should raise voltage above the resting battery level when running. If voltage stays low while the engine runs, the alternator is likely at fault. Also watch for warning lights, dimming lights, and stalling behavior as additional indicators.
Can I replace the alternator myself on a 2012-2016 Impreza?
Many owners with basic mechanical skills can replace the unit, but you should be comfortable disconnecting the battery, relieving belt tension, and torquing mounting bolts correctly. If the job requires removing other accessories, it may be more time-consuming and you might prefer professional help.
Is it worth rebuilding an alternator on this Impreza?
Rebuilding is worthwhile when the housing and pulley are intact and the failure is limited to brushes, diodes, or the regulator. Availability of rebuild kits and your comfort with the work determine whether rebuilding is cost-effective versus full replacement.
What amperage should I choose for my Impreza alternator?
Match or modestly exceed the stock amperage while accounting for any additional electrical accessories you use. Excessive overrating is not necessary unless you have high-draw aftermarket systems. Check the vehicle's stock charging specification to guide your selection.
Will a failing alternator affect modern electronics in my Impreza?
Yes. Erratic or high charging voltage can harm electronics, and low voltage can cause malfunctions. A properly regulated alternator helps preserve battery life and prevents unexpected faults in modules and infotainment systems.
How long should a replacement alternator last on the Impreza?
Lifespan depends on build quality, driving conditions, and maintenance. Well-made alternators in normal use often last many years, while exposure to contamination or heavy accessory loads can shorten service life. Choosing a unit with solid components and good warranty coverage reduces risk.
Final Verdict
When replacing the alternator on a 2012-2016 Subaru Impreza, prioritize correct fitment and sufficient rated output for your electrical demands. Pay attention to regulator quality and component durability because these affect battery life and electrical system stability. If you want lower ownership cost, favor serviceable designs or those compatible with rebuild kits; if you need maximum confidence, lean toward units with clearer warranty coverage. Balancing mechanical compatibility, electrical capacity, and warranty support will help you select an alternator that keeps your Impreza reliable on the road.
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