First of all I got my y-pipe/cat/b-pipe fix installed at a shop. No CEL until later on that evening. I checked the codes and got 0304, 0901, 1001, and 0902. The first is the knock sensor, I'll have to replace it like everyone else. the second 2 are front left and right htd 02 sensor. 0902 is undefined. I checked the code 3 times to make sure I counted correctly. Does anyone know what this is? I'm guessing it may be the other 02 sensor just behind the cat. I'm also kinda ****ed that I put new exhaust on and suddenly all of my 02 sensors are bad. I've heard of plenty of people re-using the old 02 sensors and not having any problems. Any suggestions? Could the mechanic have F'd something up? Am I just going to have to shut my mouth and fix everything?

 

My bad, 0901 and 1001 are htd 02 sensor heater. What is an 02 sensor heater? What's that going to cost? Thanks in advance for any advice.

 

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oops, forgot about that. Thx