Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Bmw M340iSerpentine Belt Diagram & Size
OEM serpentine belt spec from the factory service manual for the 2020-2024 (2020-2024).
Quick Answer
Routing: B46/B48 engine (except PHEV): REPLACING DRIVE BELT FOR ALTERNATOR B46/B48 engine (PHEV): REPLACING DRIVE BELT FOR COOLANT PUMP B58 engine: REPLACING DRIVE BELT FOR ALTERNATOR
Source: Factory service manual — 2021 Bmw M340i 2020-2024.
This vehicle's factory manual
2021 Bmw M340i: confirm the engine, trim, or drivetrain to open the available repair and diagnosis sections.
What You'll Need
Related for Your 2021 Bmw M340i
Frequently Asked Questions
- What size serpentine belt does a 2021 Bmw M340i use?
- Refer to the factory service manual for the exact serpentine belt specification for your 2021 Bmw M340i.
- How do I know if my Bmw M340i serpentine belt is bad?
- Common signs include squealing on startup (especially when cold), visible cracks or fraying on the ribbed side, power steering or A/C failure, and battery warning lights. The factory manual includes inspection criteria and replacement intervals.