LuvMaClio
How to Address P0420 Code on My Renault Clio?
Summary of the thread
A 2003 Renault Clio is showing a P0420 code, indicating a 'Catalyst system efficiency below threshold bank.' The initial step to address this issue is to check for exhaust leaks before the catalytic converter, as these can impact its efficiency. If no leaks are found, using a catalytic converter cleaner is suggested as a potential solution.
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RENAULT
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CLIO
CarlyMechanic
Start by checking for any exhaust leaks before the catalytic converter, as these can affect its efficiency. If there are no leaks, you might consider using a catalytic converter cleaner as a next step. Let us know how it goes or if you have any further questions!