P0420 Diagnostic Trouble Code Discussion for July 2021
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2008 Jeep Wrangler Unlimited Rubicon 3.8L Misfire VIN: 1J8GA69188 P0420: bank 1 cat eff. this jeep was here about two years ago for a misfire. we found no signal from pcm to fire #6 at the coilpack, replaced computer, programmed, problem solved. now returned with misfire complaint. found ignition wires in poor condition and changed them. all m... |
July 12, 2021 |
