What size serpentine belt does a 2021 Bmw 740i use?

Refer to the factory service manual for the exact serpentine belt specification for your 2021 Bmw 740i.

How do I know if my Bmw 740i 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.

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 740iSerpentine Belt Diagram & Size

OEM serpentine belt spec from the factory service manual for the 2016-2022 (2016-2022).

Quick Answer

Routing: 740i/740i xDrive/740e xDrive/745e xDrive: REPLACING DRIVE BELT FOR ALTERNATOR (740i 2016-2022, 740i xDrive 2017-2022) REPLACING DRIVE BELT FOR COOLANT PUMP (740e xDrive PHEV 2017-2019) REPLACING DRIVE BELT FOR COOLANT PUMP (745e xDrive PHEV 2020-2022) 750i/750i xDrive: REPLACING DRIVE BELT FOR ALTERNATOR (750i 2016-2019) REPLACING DRIVE BELT FOR ALTERNATOR (750i xDrive 2016-2022) REPLACING DRIVE BELT FOR AIR CONDITIONING COMPRESSOR (750i xDrive 2016-2022) M760i xDrive: REPLACING DRIVE BELT FOR ALTERNATOR (M760i xDrive 2017-2022) REPLACING THE DRIVE BELT FOR ALTERNATOR 2/COMPRESSOR FOR THE AIR CONDITIONING (M760i xDrive 2017-2022)

Source: Factory service manual — 2021 Bmw 740i 2016-2022.

Other specs:All specs Oil Type Coolant Tire Size Spark Plugs Trans Fluid Brake Fluid Capacities

This vehicle's factory manual

2021 Bmw 740i: confirm the engine, trim, or drivetrain to open the available repair and diagnosis sections.

Open this vehicle’s service manual

What You'll Need

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Serpentine Belt

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Maintenance Specs

🛢️Oil Type & Capacity ❄️Coolant Type 🔘Tire Size ⚡Spark Plug Type ⚙️Transmission Fluid 🚨Brake Fluid 🧪Fluid Capacities

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Frequently Asked Questions

What size serpentine belt does a 2021 Bmw 740i use?: Refer to the factory service manual for the exact serpentine belt specification for your 2021 Bmw 740i.
How do I know if my Bmw 740i 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.