had a 2 1/2" catback installed and now the CEL comes on, air/fuel monitoring
 

the CEL comes on after catback install 2 1/2" cb, scanner says air/fuel monitoring. What could it be?
help :'(

Re:had a 2 1/2" catback installed and now the CEL comes on, air/fuel monitoring
 

What were you running before? just an open DP? What fuel management are you using also?

Re:had a 2 1/2" catback installed and now the CEL comes on, air/fuel monitoring
 

You might need an O2 simulator? I'm not sure how that works, check www.thermal99.com he has a nice writeup on his tech section about it.

Re:had a 2 1/2" catback installed and now the CEL comes on, air/fuel monitoring
 

i was dumb for 1/2 hour and connected the 2 color wires wrong on the new O2 sensor. my a/f gauge doesn't work and i read the instruction with the O2 sensor. :'(

Re:had a 2 1/2" catback installed and now the CEL comes on, air/fuel monitoring
 

sounded like user error. so problem solved?

Re:had a 2 1/2" catback installed and now the CEL comes on, air/fuel monitoring
 

I'm gonna connect the wires correctly this afternoon. I'll post the results. The car does idle smoother even with the new o2 sensor connected on wrong.

Re:had a 2 1/2" catback installed and now the CEL comes on, air/fuel monitoring
 

I connected the o2 sensor correctly and the a/f gauge works once again. now i get a air/fuel metering error code.
i erased the code from the computer with the obd2 scanner and no more CEL for now anyways. anyone know what the air/fuel mettering error code is?