can anyone please tell me exactly...

[bolantej]

Where the a/f sensor is? I've read before the cats, so is it the one just before the cat on the exhaust pipe, or is it closer to the engine? Got codes p0125 and p1130, jiggled the wires and got p0125 and p1135.

I have searched, but may have missed it.

It all started after changing the starter contacts from below.

 

[kball]

but.. the one just before the cats is the one closer to the engine... Yes, it's the pre cat sensor, before the cats, whether you have one or two cats you'll have to find out.

 

[bolantej]

I meant not under the truck but accessible from the engine compartment. So, the one directly next to the cat is the AF sensor? I have two cats since I'm in Cali. thank you! Anyone else has advice, that would be great.

 

[kball]

Yes, you have an A/F sensor before the cats and then an O2 sensor after them.

 

[bolantej]

Wonderful, thank you.