P0420 Diagnostic Trouble Code Discussion for February 2019
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2011 Chevrolet Traverse LT 3.6L MIL Lamp on VIN: 1GNKVJED0B P0420: Cat efficiency bank 1. ... originally came in with P0300, P0303, P0008, P0420, running rough due to failed coil. Replaced #3 coil and all spark plugs, told him needed cat but said he'd return for that. The car went about 50 miles and came back with the ck eng light back on, no ... |
February 01, 2019 | |
| 2006 Land Rover LR3 SE 4.0L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: SALAD24436 P0420: Cat efficiency. Vehicle serviced here regularly. Check Engine Light and symptoms all started last night. Drove perfectly before yesterday. Last oil change was here 1500 miles ago and can confirm no CEL or driveability issues. Symptoms are low idle, surging at idle, wont s... |
February 07, 2019 |
