DTC P0420, P0430, P2096 - keywords 3.6 4.6 catalyst exhaust leak LH2 LY7 MIL O2 oxygen pipe post sensor SES
| Subject: | DTC P0420, P0430, P2096 |
| Models: | 2005 Cadillac CTS, SRX, STS |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment of check engine light with DTC of P0420 or P0430. DTC P2096 may also be present.
Recommendation/Instructions:
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 586-947-7300.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
