How much does it cost to fix an alternator on a Subaru?
Typical total costs range roughly from 350 to 1,500, depending on model, parts choice, and local labor rates.
Costs vary based on whether you install a remanufactured unit or a brand-new OEM part, how accessible the engine bay is, any additional parts that must be replaced (like belts or a battery), and the shop’s diagnostic fees or core charges. Model-specific access can also influence how long the repair takes and, therefore, the price.
Cost components that shape the price
Understanding the building blocks helps explain the price range you’ll see on estimates.
- Parts choice: remanufactured or rebuilt alternator versus a new OEM or aftermarket unit. Remanufactured units are typically in the $200–$400 range; new OEM can run $500–$900 or more depending on the Subaru model.
- Labor time and rate: replacing an alternator generally takes about 1.5–3 hours, with shop rates commonly $75–$125 per hour, translating to roughly $110–$375 in labor.
- Additional components: belts, tensioners, pulleys, or a battery if the old one is weak; these add $40–$300 in parts and some extra labor.
- Core charges and warranties: many remanufactured parts come with a refundable core deposit ($50–$120) and warranty terms (often 1–3 years or more).
- Diagnostics and shop fees: some shops charge a diagnostic fee or have a minimum service charge; check the invoice for clarity on these items.
In practice, expect a total that generally falls within the broad range of $350 to $1,500, depending on engine accessibility and the choices you make for parts and service.
Typical scenarios by model or access difficulty
Different Subaru models and engine layouts affect how long it takes and what parts are needed.
- Accessible installations on common models (Forester, Outback, Impreza with straightforward serpentine-belt routing): typically $350–$850 with a remanufacturered part; $750–$1,000+ with a new OEM part.
- Moderate difficulty (tighter engine bays or dual-belt setups): generally $550–$1,100 with remanufactured parts; $1,000–$1,400+ with a new OEM and any necessary extra components.
- Most involved jobs (restricted access or multiple supporting repairs like a failing tensioner or water pump): $900–$1,500+, with final cost highly dependent on parts choice and labor rate.
Costs vary by region and shop, so obtaining a written estimate that itemizes parts, labor, and any core or diagnostic charges is advisable.
DIY vs professional service
Choosing to tackle an alternator replacement yourself can save on labor, but it requires the right tools and precautions.
- Pros and cons of DIY: potential savings on labor, but higher risk of incorrect installation, damage to electrical systems, or battery-related hazards if you’re not experienced.
- Tools and prep: typically include basic hand tools, a torque wrench, a belt tensioner tool if needed, a multimeter, and a safe work environment.
- Warranty and safety considerations: many components and vehicle warranties may be affected; proper disposal of the old unit and correct belt routing are essential.
For most Subaru owners, professional replacement offers the best balance of reliability, warranty coverage, and overall value, especially given the engine layouts and belt routing in many Subaru models.
What to expect on your invoice
Common line items you’ll see when replacing an alternator include the parts, labor, core charge, and any diagnostic or shop fees.
- Parts: the cost of the alternator (remanned vs OEM) and any related hardware or belts.
- Labor: the time required to remove the old unit and install the new one, often charged in increments.
- Core charge: a refundable deposit on remanufactured units.
- Diagnostics and disposal fees: charges for testing the electrical system or disposing of the old unit.
Ask for a detailed estimate before work begins and request that any additional repairs be approved in writing if they arise during replacement.
Summary
Replacing a Subaru alternator is typically a mid-range repair in terms of cost. The final price depends on whether you choose a remanufactured or OEM unit, the engine’s accessibility, regional labor rates, and whether other components (like belts or a battery) need replacement. Expect a ballpark of $350 to $1,500, and always secure a written, itemized estimate from your shop. Comparing quotes across a few independent shops can help you find the best value while ensuring proper installation and warranty protections.
How long do Subaru alternators last?
Alternators generally last about 150k in my experience, however I've seen some go at 90k and some go at 300k so it's just a part that goes when it goes. I would never change one before it starts showing issues unless it's to get more amps.
How much does it cost to replace a Subaru alternator?
Replacing a car's alternator can cost about $350 to $1,500 or more, depending on the type of car and the alternator's location within the engine bay and how easy it is to access. If your alternator is on the fritz, here's what to know about replacing it.
How to tell if a Subaru alternator is bad?
How to Know If You're Subaru Alternator Is Failing
- Dim Lights.
- Dead Battery.
- Whirring and Buzzing Noises from the Engine.
- Unusual Electrical Bugs.
- The Car Stalls.
Is it worth fixing an alternator?
Whether it's worth fixing an alternator depends on the extent of the damage; minor issues like a loose belt or worn-out brushes are often more cost-effective to repair, while severe damage makes replacement the better option. Fixing a minor problem can save money and prevent more expensive damage to other electrical components, but if the alternator is old or the damage is catastrophic, replacing it with a new or rebuilt unit is recommended.
When to consider fixing it
- Minor issues: If the problem is simple, like a loose belt or a faulty diode, a repair is often a good idea.
- Cost savings: A minor repair can be significantly cheaper than buying a new part and can prevent future, more costly problems from developing.
- Relatively new part: If the alternator is not very old, it's more likely that a repair will be a worthwhile solution.
When to consider replacing it
- Extensive damage: If the alternator has suffered catastrophic damage, such as a broken housing, replacement is the only viable option.
- Old alternator: If the unit is old and nearing the end of its typical lifespan (80,000–150,000 miles or 7–10 years), replacing it with a new or rebuilt one is often more reliable in the long run.
- Cost-effectiveness: Sometimes, even for non-catastrophic issues, replacing the entire unit can be more cost-effective than attempting a complex repair.
