99 Boxster CEL codes after cat replacement
 

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

Well, I would recommend that you put the stock parts back on, pass your emissions test, then swap back to the straight pipes, and finally work out the issues your car has with the CEL and the straight pipes.

BC.