Question about 2004 Cadillac CTS 2.6
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this TSB:
Some customers may comment of check engine light with DTC of P0420 or P0430. DTC P2096 may also be present.
The cause may be a hole in the weld of post catalyst O2 sensor boss on the exhaust pipe which allows outside air into the pipe at the O2 sensor and skews the post catalyst O2 sensor reading. The hole may or may not be readily visible, depending on its position. If a hole is found, it may be repaired by welding it shut. If a hole is found on a 2006 model year vehicle, please contact Dave Dickey at(NNN) NNN-NNNN
Pay attention that if you buy gas at a known good station, the code will go away. So, fuel quality does play a role in this. The chemical treatments are something that are new to me, but my parts salesman says he has heard good things from his customers about it.
Hope this helps.
Posted on May 03, 2013
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Posted on Jan 02, 2017
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