P0420 Diagnostic Trouble Code Discussion for November 2020
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2012 Jeep Grand Cherokee Laredo 3.6L MIL Lamp on VIN: 1C4RJFAG5C P0420: cat efficiency bank1. ... 3.6L came in with stored p0420 and p0430 catalyst efficiency codes. Front oxygen sensors are not lazy (switch rich/lean normally) and downstream sensors look normal at 2500 rpm, holding steady near half a volt, and there are no exhaust leaks. There is ... |
November 23, 2020 |
