My 95 Taco 3.4 failed the NOX test, barely.
I am getting a P0141, which is the downstream O2. AZ only does a sniffer test on 95s, as I understand it, the downstream O2 is just a monitoring devise and would not affect exhaust output. I really have no other known issues. There is no EGR, timing and fuel/air mixture is set by the computer.
My plan is to clean the MAF, air filter, PVC and throttle body but I don't see any of those having much of an impact. Unfortunately, AZ does not recognize a 95 as OBD2 compliant, so just correcting codes has limited value. The computer only shows the one error, so not much to go on. I'm not in a good position to throw parts at it until it passes. Anyone have any additional thoughts?
My plan is to clean the MAF, air filter, PVC and throttle body but I don't see any of those having much of an impact. Unfortunately, AZ does not recognize a 95 as OBD2 compliant, so just correcting codes has limited value. The computer only shows the one error, so not much to go on. I'm not in a good position to throw parts at it until it passes. Anyone have any additional thoughts?