Re: BMW 335i HFS-3 power problems
Not sure what you meant by engine light stays on. Are you referring to the HFS3 controller or the car.
The circuit board is quite old, it may need to be return to be upgraded or just purchase a newer HFS4 controller. The HFS3v2 was not strictly configured for the 335i or Di engines. The fuse is not properly inserted into the holder.
Can you take a picture of the underside of the circuit board. I like to see how it is configured.
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Richard L
aquamist technical support
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