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  2. Detailed Sheets

Detailed Sheets

This section brings together our detailed sheets on fault codes, targeted failures, and specific technical cases. Each content helps to better understand a symptom, its possible causes, and the checks to be performed.

Understanding the P0420 Code on Peugeot 205
OBD Codes & Warning Lights 8 April 2026

Understanding the P0420 Code on Peugeot 205

The P0420 code on the Peugeot 205 typically indicates insufficient catalytic converter efficiency as detected by the engine management system. In simpler …

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