My check engine light keeps comming coming on for my o2 sensors and catalyst below threshold along with the knock sensor code. I've replaced all of the 02 sensors and the catalytic converter. What could be wrong that would cause all of these codes? Also I'm not sure if it's related but sometimes when i break hard the car stalls and there seems to be a delay in the acceleration. My xterra is NOT supercharged. And it has a new timing belt.
So Im not throwing a code for the TPS but im showing a lot of symptoms of a faulty TPS along with a lean code which could cause the P0420 code. Should i replace the TPS even though there isnt a code for it?
I already tried dripping some machine oil on the actuator yesterday and it doesn't seem like its done anything :/. Could it be the TPS or would that for sure throw a code?
I cleared the check engine light. It came back on showing all 4 O2 sensors and the knock sensor. The P0420 code is intermittent and every now and again ill get a running lean code. There is a lag in acceleration and the idle is rough sometimes.
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