taggate

iTrader: (2)

hey people, i need help if anyone knows this problem or had it. The codes that I got was 0503 which is - Front oxygen sensor or circuit fault - and 0907 which is undefined. But the striange thing is when i resetted the codes and started up the car a hissing noise started from below the car. could someone clear this up for me. Could this be a lose nut on the O2 sensor? any help would be apperiacated thank you.

The CEL come on while i was driving. Thank you in advance

taggate

iTrader: (2)

can some on pin point the location of the front O2 right bank - for a non-cali spec - is it the located in hte exhaust pipe between the exhaust manifold and the catalytic converter?