I have 4 codes coming up on my 318i 2001 bmw engine code N42B20A
10040 undocumented code
P278E difference pressure sensor intake mainfold
P274E misfire detection summation error
P2722 o2 sensor 2 before cat
Replace the Oxygen sensor. All your trouble codes are downstream of the oxygen sensor, and are related to it.
Once you replace the oxygen sensor (replace with a BOSCH sensor!), remove the positive battery cable, step on your brakes for 10 seconds, then reattach the cable. This will clear the codes from your ECM (Electronic Control Module).
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code 1`0040 undocumented code only,engine running fine i think it is the o2 sns bank 1 before cat heater scope engine no pattern on o2 sensor before cat reading inactive.
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