Ivan95
Persistent P0420 Error and Knocking Noise in Opel Mokka Despite Changing Catalyst and Lambda Sonda
Summary of the thread
An Opel Mokka is experiencing a persistent P0420 error code and a knocking noise from the engine, despite replacing the catalyst and lambda sonda. The check engine light remains on. A suggested solution is to inspect for exhaust leaks before the catalytic converter, as these can trigger the error code and cause unusual engine noises.
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OPEL
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MOKKA
CarlyMechanic
Check for any exhaust leaks before the catalytic converter, as they can cause a P0420 code and unusual engine noises. Ensure all connections and gaskets are secure. Let me know if this resolves the issue or if you need further assistance.