Having problems with your 2001 Daewoo Lanos ?

Fault code p0420+ catalyst system efficiency below threshold (bank 1)

Posted / edited by AnonymousUser on : 10-12-2018

Answers :

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!!
Repair Help & Product Troubleshooting for 2001 Daewoo Lanos

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