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Hi All,

I've been getting a random misfire CEL (P0300) and from reading the freeze frame I can see I have an issue with Fuel system 2 - most likely an O2 sensor but could be a number of things.

My question is what is the difference between Fuel System 1 and 2 on our cars? I've googled this for hours to no avail.

I don't have the exact freeze frame data but it looks like this...

Fuel Sys 1: CL
Fuel Sys 2: CL-Fault
Calc Load: xx.xx%
ECT: xxx degrees
STFT: B1 +/-xx.xx%
LTFT: B1 +/-xx.xx%
MAF: xx.xx g/s
TPS: xx.xx%
RPM: xxxx
Speed: xxMPH

I understand everything else (temp, fuel trim, mass air flow, blah blah) but the two fuel systems have me stumped. Would a fault on one versus the other point me to a different issue?

 
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would need to know what type of car this is to help

 
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This is for a 2001 Acura EL (Canada's version of a 2001 Civic SI - D17A2 engine, 5spd Manual). The car comes standard with one primary and one secondary o2 sensor, one sensor pre cat and the other post cat.