Question about Cars & Trucks
This is not an evap code. Read on:
P0420 - Catalyst System Efficiency Below Threshold Bank 1
Possible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)
Tech notes The most common cause it the three way catalyst converter Bank 1. Changing just the O2 sensor usually don't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.
Posted on Nov 02, 2012
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Posted on Jan 02, 2017
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