I own a 96 Maxima SE. Five speed transmission. I recently replaced the stock y-pipe with a Warpspeed stainless y-pipe and the airfilter with a Frankencar hybrid filter. Shortly after I put on the new equipment the check engine light appeared. A diagnostic check revealed that the problem was one of the O2 sensors on the exhaust pipe. The appropriate sensor was replaced and the light went out. The problem appeared solved until the next day and 85 miles later and it reappeared. It intermittantly turns on and off. Any ideas?

 

have you reset the ECU?

 

Hmm well like erty67 said... reset the ECU by turning that screw two times. Perhaps there is a loose connection w/ the sensor. Check that out. Good luck.

 

Yes. ecu was reset. Light still goes on and off intermittently. Usually waits about 75-100 miles before it turns off and another 75-100+ miles before it comes on again......

 

MY LIGHT GOES ON ALL THE TIME I JUST GAVE UP. IT ALWAYS TELLS ME IT'S MY SENSORS AND I'VE TRIED TO RESET MY ECU LIKE 10 TIMES BUT IT STILL COMES ON.

 

why are you yelling at him?

make sure the connections on the o2 sensors are fine in the y pipe itself, and also in up front in the engine bay

 

Im currently experiencing this too. After i reset the ecu it stays good for a few days. I did notice that it usually takes a bump or something that shakes up my car to trigger the CEL. So im guessing its a loose wire on one of the 02 sensors, I'll find out when i get a new Y-pipe.