Alright so I just put my cattman y pipe and catback on and reset the ecu. Drove about 40 miles and next thing I see is a big orange glowing light. I check codes and I got 0210 which is lean fuel inj sys left bank. Now my question is how does an o2 sensor go bad after a new y pipe. Has anyone had this problem? I am pretty sure I dont have an exhaust leak but I havent checked it yet. Everything was fine until I replaced my exhaust. So it is either exhaust leak or O2 sensor. I figured the lower sensor by the cat would go first since the piping is larger and more air flow coming through. But the y pipe one?

 

I had that problem when I first put on my Y-pipe like 3 1/2 year ago. This was my first Y-pipe and I had a shop install it. I reset the ECU about 10 times and couldnt get the dam* code to go away, so I just got a New sensor and it dissapeared.

I linked the code to a possible bad install. If the O2 sensor is banged against anything during the install, the sensor can break loose on the inside resulting in a dead sensor and a code.

-matt

 

Well the left bank one definately wasnt hit against anything. I pulled the old y pipe off with the sensor still attached, took it out and put it in the new pipe. So it wasnt hit on anything. Guess it was on the verge of going out and the added air flow pushed it over the limit.

 

Well I felt around my y pipe today and I cant say for sure but I could feel a little bit of air. So maybe there a minor exhaust leak.

Does anyone know the torque specs for the y pipe to manifold nuts? I torqued them to 55 ft lbs but I couldnt find a real torque spec for them.

 

Well nvm I found it in the FSM 45-50 ft lbs guess i overtightened them so they shouldnt be leaking. Guess I will replace the O2 sensor.

 

leave ur battery unplugged for ten seonds to reset and then run ur car and see if the light come sback on... if it does.. then u need a new sensor

 

its really easy to break them, considering all the heat cycles they go through i can imagine they could get very brittle and break easy.