P0420 Diagnostic Trouble Code Discussion for November 2018
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2008 Chevrolet Uplander LS 3.9L MIL Lamp on VIN: 1GNDU23198 P0420: Catalyst efficiency. ... runs by an elderly couple. P0420 will set intermittantly if cleared. If driven on highway for a half hour or longer it will clear the code. has new plugs and wires,no evidence of coolant ingestion, and no power loss suggesting a plugged exhaust. no ot... |
November 08, 2018 | |
| 2005 Nissan Pathfinder LE 4.0L No Start, MIL Lamp on VIN: 5N1AR18W85 P0420: Catalyst Efficiency Below Normal (Bank 1). ... complaint of an intermittent no start. started everytime for us so we shipped it. came back this week on the hook. will not start. cranks fine.scanner shows p0420-cat efficiency code and o2 heater code. would not pop off on brake clean. no spark at co... |
November 27, 2018 |
