Expect to pay roughly $150 to $900 for the alternator itself, depending on whether you choose aftermarket or OEM, new or remanufactured; labor to install it typically adds about $100 to $300, bringing the total installed price to roughly $300 to $1,300 depending on options and location.
Prices vary by model year and engine variant (the 335i has been equipped with different engines over its generations, such as the N54 and N55), and by whether the part is new, remanufactured, or used. The following guide outlines typical costs and what to consider when shopping for an alternator for a BMW 335i.
Cost overview
Prices for the alternator itself depend on sourcing and specification. The list below outlines common options and their typical price ranges for the replacement part (not including labor).
- OEM new from the dealer: typically $600–$900
- OEM remanufactured: typically $400–$600
- Aftermarket new: typically $150–$350
- Aftermarket remanufactured: typically $100–$250
- Used or salvaged unit: typically $50–$150
Prices can vary by region, vehicle year, and the exact electrical spec required. Always verify compatibility with your VIN and engine variant before purchase.
What affects price and installation
The price you pay is influenced by several factors: the generation of the 335i (N54 vs N55), the amperage rating of the alternator, whether you buy OEM or aftermarket, and whether the unit is new, remanufactured, or used. Labor costs and regional differences in shop rates also play a big role, as does whether additional components (belt, tensioner, or pulley) need replacement during the job.
Amperage and compatibility
Amperage ratings for replacements commonly fall in ranges such as 120A, 150A, or 180A. The exact specification must match the vehicle’s VIN to ensure proper fitment and electrical performance, and some shops can confirm compatibility by part number or VIN lookup.
Labor and installation considerations
Labor costs vary by region and shop type. Typical installation takes about 1–2 hours, with labor rates ranging roughly from $75 to $150 per hour in many regions. Dealerships or BMW-specialty shops often charge more, but may include a warranty on the installation. It’s also wise to inspect and possibly replace related components (belt, tensioner, pulleys) if they show wear or are due for service.
- Dealership or BMW-specialty shop: higher hourly rates, but added warranty and OEM support
- Independent mechanic: lower rates, reliable for standard alternator replacements
- DIY: lower parts cost but higher risk if electrical systems are unfamiliar; requires appropriate tools and safety precautions
When budgeting, include potential costs for belt installation or replacement if the belt shows cracking or wear, as well as any diagnostic time if the car’s electrical system flags other issues.
Where to buy
Several reputable sources offer BMW 335i alternators. Consider official BMW parts departments for OEM units, established auto parts retailers for aftermarket options, and online retailers for competitive pricing. Always verify compatibility with your exact model year and engine variant, and check return policies and warranties.
- BMW dealer or OEM parts supplier
- Auto parts chains (e.g., AutoZone, Advance Auto Parts, O'Reilly)
- Online retailers (e.g., RockAuto, ECS Tuning, FCP Euro)
- Used or refurbished from salvage yards or marketplace sellers
Remember to compare total price, warranty terms, and compatibility to ensure you get the right part for your 335i.
Summary
For a BMW 335i, the alternator cost varies widely based on OEM versus aftermarket, new versus remanufactured, and amperage. Expect the part itself to range from about $50 to $900, with installation bringing the total to roughly $300 to $1,300 depending on options and local labor rates. Always confirm VIN-level compatibility, consider whether related components need replacement, and shop around across dealers, independent shops, and reputable retailers to secure the best combination of price and warranty.