How to solve Peugeot fault code P0420?

1 Answers
AmirLee
07/29/25 1:56pm
When the P0420 fault code appears in a car, it mainly indicates that the conversion efficiency of the catalytic converter is below the threshold value. The possible cause is a damaged catalytic converter. Here are 3 quick solutions to resolve the Peugeot fault code P0420: 1. Replace the vehicle's original catalytic converter (avoid using aftermarket parts as they may not last long and the fault light could reappear). 2. Install a TDTAS fault code eliminator or similar component to repair the data and clear the P0420 fault light. 3. Use a car diagnostic tool to access the engine ECU and disable the P0420 fault code (this method may work for some vehicles but not all).
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