P0420 Diagnostic Trouble Code Discussion for August 2023
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2005 Ford F-150 King Ranch 5.4L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1FTPW12575 P0420: Catalytic. Hello, need HELP! 2005 F150 w/ 5.4 (3 valve) and 192k miles. Towed in. Customer claims it happened while he was driving. He noticed it lost some power while driving but not much. Then a few miles more of driving it got very gutless then it died. Very h... |
August 10, 2023 | |
| 2004 Chevrolet Silverado 1500 5.3L Misfire VIN: 1GCEC14T14 P0420: Catalyst System Low Efficiency (Bank 1). Tia for any help y'all can provide. Please read related repair history. Customer returned with truck still exhibiting intermittent idle misfire. We removed the heads for a valve job and replaced a warped intake manifold. After reassembly we still had the m... |
August 31, 2023 |
