8 documented codes across 44 real diagnostics.
Exhaust gas recirculation flow, valve position and cooler. Classic diesel carbon-fouling territory.
Ranked by how often we actually see them
- P0400, Exhaust gas recirculation flow
- P0401, Exhaust gas recirculation flow insufficient
- P0402, Exhaust gas recirculation flow excessive
- P0403, Exhaust gas recirculation control circuit
- P0404, Exhaust gas recirculation control circuit range/performance
- P0407, Exhaust gas recirculation sensor B circuit low
- P0409, Exhaust gas recirculation sensor A circuit
- P2413, Exhaust gas recirculation system performance