P0400 Moderate Powertrain

Exhaust Gas Recirculation Flow Malfunction

Common Causes

Clogged EGR valve or passages
Failed EGR valve
Damaged EGR vacuum lines
Failed DPFE sensor (Ford)

Common Symptoms

EGR System Issues

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Quick Info

Code P0400
System Powertrain
Severity Moderate

Disclaimer

This information is for diagnostic guidance only. Always verify repairs with a qualified technician before performing safety-critical work.

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