P0404 - Exhaust Gas Recirculation (EGR) Control Circuit Malfunction (Solution)

Error code P0404, Exhaust Gas Recirculation (EGR) control circuit, range/performance:

Possible symptoms:
- Power loss.
- Engine is noisy under load.

Possible causes:
- Wiring or connector to the AGR (Abgasrückführung) system is faulty (open circuit or short circuit), or the vacuum actuator on the AGR system is defective or not being properly controlled.
- Defective AGR module/AGR valve/throttle module.
- The EGR pipes and/or EGR cooler are clogged or leaking.

Solutions:
- Check the wiring and connectors, as well as the vacuum system, for the EGR valve control.
- Check the AGR module/AGR valve/throttle module.
- Inspect the EGR pipes and/or EGR cooler.

See also:
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