Trouble Ticket Help Requests for DTC P0420
|2005 Buick Rendezvous CXL 3.4L MIL Lamp on VIN: 3G5DB03E45
P0420: Catalyst System Low Efficiency. ... rendevous that keeps setting the infamous P0420. We had this vehicle in before and I had replaced the cat converter (only has one, shared with both banks)Rear HO2S mirrors primary sensor just like it did before. It was fine after I initially replaced the c...
|January 14, 2015|
|2006 Cadillac DTS 4.6L MIL Lamp on VIN: 1G6KD57Y76
P0420: Catalyst System Low Efficiency (Bank 1). Car came in with code P0420. Converter tested marginal so I replaced cat with a Walker Ultra and updated the computer with the latest software for false code P0420 setting. Ran bay test to run monitor and passed. Road tested vehicle while watching oxygen senso...
|January 17, 2015|