Citroen Diagnostic Trouble Codes

OBD2 fault codes seen on Citroen vehicles, with what each code means, its typical repair cost range, and notes on specific Citroen models.

Fuel System

P0171Moderate

System Too Lean (Bank 1)

Citroen C3 • 2009-2024

On Citroen 1.2 PureTech and 1.6 VTi/THP engines (C3, C4, Berlingo), P0171 often comes from a split o...

Emissions

P0420Moderate

Catalyst System Efficiency Below Threshold (Bank 1)

Citroen C4 • 2004-2024

On Citroen petrol engines (C3, C4, C5 with the 1.2 PureTech and 1.6 VTi/THP, shared with Peugeot), P...

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