auto error code po 0400
What does error code PO 0400 mean and how to fix this on obll diag meter
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joe greco, the P0400 Exhaust Gas Recirculation Flow Malfunction
Possible causes
- Exhaust Gas Recirculation (EGR) volume control valve stuck closed
- Faulty Exhaust Gas Recirculation (EGR) volume control solenoid valve
- Faulty EGR Valve
- Faulty EGR temperature sensor and circuit
- Exhaust Gas Recirculation (EGR) solenoid valve harness is open or shorted
- Exhaust Gas Recirculation (EGR) solenoid valve circuit poor electrical connection
- Dead (Weak) battery
from here So check the parts that could be causing this error one at a time. Start with the easier once than work your way up to more complicated and expensive
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