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How to Address P0420 Code on My Renault Clio?

Hello everyone, I own a 2003 Renault Clio with 280,000 km on it. Recently, the check engine light came on, and it's displaying a P0420 code, indicating 'Catalyst system efficiency below threshold bank.' I'm trying to figure out the best initial step to address this issue. Should I consider topping up something, or would using a specialized cleaner for the catalytic converter be a good starting point? Any advice or experiences would be greatly appreciated!

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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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!

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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!

Thank you. I will try that.

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RENAULT

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CLIO