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2004 3.3 v6 4x2 P0420

1K views 3 replies 1 participant last post by  JacCro 
#1 ·
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.
 
#4 ·
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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