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Sam, BMW Master technician
Category: BMW
Satisfied Customers: 1043
Experience:  BMW S.T.E.P. graduate, 10 years BMW dealership experience
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I read that there is a fuse under the passenger seat..blown

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Code PO491. I read that there is a fuse under the passenger seat. Once they replaced that fuse that was blown and cleared the codes there were no more P0491 or P0492 codes. It's there really a fuse under the passenger seat that can fix P0491 and P0492 codes?

Hello and welcome to Just Answer.


Can I get the last 7 digits of your VIN number?

Customer: replied 7 years ago.

last seven DS45820.

Thanks in advance!!



It looks like the fuse for the secondary air pump (fuse 102) is on the passenger inner fender. Is this what they say they replaced?


Customer: replied 7 years ago.
I read that the fuse was under the passenger seat. The seat and mats needed to be removed. It was a 50A fuse.

The fuse for the secondary air pump is the one mentioned above.


I have seen 2 common failiures with these systems.


1; the air feed hoses under the manifold brake

2; the valves wear out and stick shut

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