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!
2 comment(s)
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!
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!