EGR Valve Replacement — OM646 (NCV3 Sprinter)
Mercedes-Benz Sprinter NCV3 (Model 906) · 2.1L 4-cylinder OM646 CDI
Replace the electric EGR valve on the OM646 four-cylinder NCV3 Sprinter. Covers coolant draining, intake-pipe removal, the four EGR-valve bolts, the new gasket and O-ring, the cooler-to-valve seal, electrical reconnection, and the post-install adaptation reset.
Related Fault Codes
Diagnostic trouble codes this procedure can resolve:
- P0401Exhaust Gas Recirculation (EGR) Flow Insufficient
- P0402Exhaust Gas Recirculation (EGR) Flow Excessive
- P0403Exhaust gas recirculation control circuit malfunction
- P0404Exhaust gas recirculation control range/performance
- P0405Exhaust gas recirculation sensor A circuit low
- P0406Exhaust gas recirculation sensor A circuit high
- P0489Electrical / Power Supply / Sensor Circuit Fault
- P0490Electrical / Power Supply / Sensor Circuit Fault
- P1470Electrical / Power Supply / Sensor Circuit Fault
- P1471Electrical / Power Supply / Sensor Circuit Fault
Known Issues
Documented Sprinter failures related to this repair: