Question about 2001 Daewoo Lanos
A p0420--means one of the following has happened. an oxygen sensor is not reading properly, the engine coolant sensor is not working properly, damaged or leaking exhaust manifold /catalytic converter/ exhaust pipe, retarded spark timing, the oxygen sensors in front and back of converter are reporting too similar of readings. A P0420 - P0430 are pointing at the catalytic converter, and changing the Oxygen Sensors would be the major choice. good-luck!!
Posted on Jul 29, 2010
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Posted on Jan 02, 2017
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Possible causes - Three way catalyst converter worn out
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module
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