Question about 1996 Lexus LX 450
The code reader says: P0420=catalyst system effeciency below threshold (bank 1). I would like to solve the issue without replacing the whole exhaust system, where do I start?
With that code you most likely have to replace the catalytic converter.You can try to reset the light but it will come back in time.
Posted on Nov 29, 2008
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Posted on Jan 02, 2017
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Possible causes - Three way catalyst converter worn out
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- Fuel injector leaks
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- Improper ignition timing
- Engine Control Module
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