Question about 1996 Lexus LX 450

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I have a 1996 Lexus LX450, engine light came on. The DTC is P0420

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?

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  • Anonymous Mar 25, 2014

    OBO P0420 Catalytic System Efficiency Below Threshold (Bank)

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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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1996 taurus p420 code


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Engine light stays on, code is p0420 low thresh bank 1.... where is bank 1 located


I'm not sure you understand the difinition of OBD2 fault code P0420, it means that Catalytic converter in the exhaust that is connected to the engine cylinder bank that contains number one engine cylinder has fallen below the a allowed threshold of cleaning pollunts from the engines exhaust stream. I would be more specific but you have not given model or year of the Mercury you have.
Here is the full difinition of OBD2 fault code P0420 from the factory service information system.


P0420 - Catalyst System Efficiency Below Threshold (Bank 1)


Possible causes - Three way catalyst converter worn out
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
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Hi and welcome to FixYa!

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