P0420 Diagnostic Trouble Code Discussion for March 2018
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2000 Cadillac DeVille DTS 4.6L MIL Lamp on P0420: Catalyst System Low Efficiency - Bank 1 (California). This car had come in from dealership and customer was told converter needed replaced. Scanned checked codes had cat ineffiacncey code . Cleared code went on test drive came back. Replaced converter with aftermarket. Installed new rear O2 sensor. Test drove... |
March 12, 2018 | |
| 2012 Jeep Compass Limited 2.4L MIL Lamp on VIN: 1C4NJDCB1C P0420: catalyst efficiency. just wondering if there's a quicker way to see if Chrysler has a programing update for this issue because the catalytic converter is working well. |
March 19, 2018 | |
| 2010 Saab 9-3X 2.0L Excessive Emissions, MIL Lamp on VIN: YS3FD5BY1A P0420: cayalytic convertor weak. catalytic convertor failed -p0420.replace cat with the only one I could find for this all wheel drive saab-p0420 returned within 200 miles.no o2 sensor codes and scope good.I think aftermarket cat is weak as most are.customer loves car and wants to fix but I h... |
March 28, 2018 |
