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 MANUALSMERCURY2009MOUNTAINEER 4.6 8, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P1112: - INTAKE AIR TEMPERATURE (IAT) CIRCUIT INTERMITTENT
2009 Mercury Mountaineer 4.6 8, RWD
DTC P1112: - Intake Air Temperature (IAT) Circuit Intermittent
2009 Mercury Mountaineer 4.6 8, RWDSECTION DTC P1112: - Intake Air Temperature (IAT) Circuit Intermittent
DTC P1112: - INTAKE AIR TEMPERATURE (IAT) CIRCUIT INTERMITTENT
| Description: | Indicates the IAT sensor signal was intermittent. | ||
| Possible Causes: |
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| Diagnostic Aids: | Monitor the IAT on a scan tool. Look for sudden changes in the reading when the harness is wiggled or the sensor is tapped. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | - | - | GO to Pinpoint Test DA . |
RENDER: 1.0x
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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.