P0402 is rated as medium severity. Schedule service — affects performance or emissions.

P0402

EGR Excessive Flow Detected

Q: What does code P0402 mean?

EGR Excessive Flow Detected: The EGR system is flowing too much exhaust gas, causing rough idle or stalling.

Powertrain Code · Medium

What does P0402 mean?

The EGR system is flowing too much exhaust gas, causing rough idle or stalling.

System: EGR System

P0402 is a powertrain diagnostic trouble code indicating egr excessive flow detected. This code is classified as medium severity, which means: schedule service — affects performance or emissions.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.