P0420 Diagnostic Trouble Code Discussion for March 2017
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2008 Mitsubishi Lancer Evolution MR 2.0L MIL Lamp on VIN: JA3AW56V68 P0420: Catalytic converter below effeiency. ... problem. Have observed inactivity at times at start up. Replaced sensors again with denso sensors again no change. Must mention originally came in with only the P0134. Now we have a P0420 also. |
March 13, 2017 |
