Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2010MARINER PREMIER, 2.5 7, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P0406: EXHAUST GAS RECIRCULATION (EGR) SENSOR A CIRCUIT HIGH
2010 Mercury Mariner Premier, 2.5 7, FWD
DTC P0406: Exhaust Gas RECIRCULATION (EGR) Sensor A Circuit High
2010 Mercury Mariner Premier, 2.5 7, FWDSECTION DTC P0406: Exhaust Gas RECIRCULATION (EGR) Sensor A Circuit High
DTC P0406: EXHAUST GAS RECIRCULATION (EGR) SENSOR A CIRCUIT HIGH
| Description: | The EGR monitor checks the EGR sensor signal to the powertrain control module (PCM) for high voltage. The test fails when the average voltage to the PCM exceeds the maximum calibrated value. | ||
| Possible Causes: |
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| Diagnostic Aids: | A DPFEGR PID reading greater than 4.5 volts with the ignition ON, engine OFF or running indicates a hard fault. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Crown Victoria, E-Series, Explorer 4.0L, Explorer Sport Trac 4.0L, F-150 4.6L 2V, F-Super Duty 6.8L, Grand Marquis, Mountaineer 4.0L, Mustang 4.0L, Mustang 5.4L, Town Car |
GO to PINPOINT TEST HH . | ||
| All others | GO to PINPOINT TEST HE . | ||
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.