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.
New diagnosis requests for engine control units: Notes
For the following engine controls, the status requests have been simplified and enhanced from the F01 onwards:
- Diesel engines: B37, B47, N47, N57
- Petrol engines: B38, B48, N55, S55, N63, N63T, S63
All status requests are listed in a functional group and are grouped in number blocks. The status requests can thus be mixed in any combination and are identical for the specified engines.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.