[308nut]

I replaced the cats on my car with bypass pipes custom made for me by a local fabricator.

I am getting a CEL with the following codes

P0154 02 ahead of cat cylinder 4-6 Interuption of Signal
P1117 02 heating 1 ahead of cat below lower threshold
P1121 02 heating 2 ahead of cat below lower threshold
P0137 02 ahead of cat cylinder 1-3 Short circuit


can this be related to the new bypass pipes, or something totally different. Should I replce the 02 sensors or put the cats back on.. I am due for an emmisions test and it will not pass with a CEL on.


Thank You


Wade