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In an American context, the BMW e60 error code 9c54 means that the gas cap is not securely tightened, leading to the check engine light turning on. Simply tightening or replacing the gas cap will resolve this issue and turn off the warning light.
Hmm... It's actually an AC sensor for the air conditioning system.
The BMW e60 error code 9c54 means that the fuel cap is not secure and should be fastened securely.