JB4 will always show zero for the FPL because
your car's model doesnt have a LPF sensor . It can only read the high pressure value from the sensor at the end of your fuel rail .
if im correct , only early n55's with the older style N54hpfp do have a LPF sensor
but that wont solve your problem .
get a decent mechanic to look at it before replacing parts your not sure about .
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M140i DP , OPF delete , MHD stg2 93oct , xhp stg3
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