DTC P0402: Exhaust Gas RECIRCULATION (EGR) Flow Excessive Detected
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
P0402 - EXHAUST GAS RECIRCULATION (EGR) FLOW EXCESSIVE DETECTED
| Description: | The EGR system is monitored for undesired EGR flow during idle. The EGR monitor looks at the differential pressure feedback EGR (DPFE) signal at idle and compares it to the stored signal measured during ignition ON engine OFF. The test does not pass when the signal at idle is greater than at ignition ON engine OFF by a calibrated amount. | ||
| Possible Causes: |
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| Diagnostic Aids: | A DPFEGR PID reading that is greater at idle than during KOEO by 0.5 volt or a rough engine idle may indicate a hard fault. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Crown Victoria, E-Series, F-Series Super Duty 6.8L, Grand Marquis, Mustang 5.4L, Town Car |
GO to PINPOINT TEST HH . | ||
| All others | GO to PINPOINT TEST HE . | ||