Leaving the P0113 code unresolved on a Ford can lead to drivability problems, reduced fuel economy, and potential emissions issues, with a risk of more expensive repairs later.
In Ford vehicles, the P0113 code points to the Intake Air Temperature (IAT) Sensor 1 Circuit High Input. The engine computer expects a moderate voltage from the IAT sensor that changes with air temperature; when it reads a voltage higher than normal, it can misread intake temperature and adjust fuel delivery incorrectly.
What the code means for your Ford
Understanding the symptom and its implications helps car owners decide whether to attempt a DIY fix or pursue professional service. The code alone indicates a voltage fault on the IAT circuit; the actual effect on the engine depends on how the PCM uses that signal in real time.
Potential symptoms you might notice
If the code is present, a Ford may show a mix of the following symptoms, though some engines run more or less normally depending on how aggressively the PCM compensates for the faulty reading. The check engine light may or may not be accompanied by other codes.
- Rough idle or occasional stalling
- Decreased fuel economy
- Ambiguous or inconsistent engine temperature readings
- Check Engine Light (CEL) or MIL illuminated
Symptoms can vary by model year and how the PCM adapts to an abnormal IAT signal. Ignoring the code can lead to longer-term drivability problems.
Common causes of P0113 on Ford vehicles
Understanding why the high input condition occurs helps target the repair. The typical culprits fall into sensor, wiring, and reference-supply categories:
- Faulty or stuck IAT sensor (senses an abnormally high temperature signal regardless of actual air temp)
- Damaged or corroded wiring or a loose/dirty connector in the IAT circuit
- Short to 5V or inadequate ground in the sensor circuit
- Vacuum or intake leaks near the sensor that skew readings
- PCM/ECM electrical fault (less common, but possible)
In many Ford models the IAT sensor is located in the intake manifold or near the throttle body, making wiring and connector issues a frequent source of P0113. If the intake is contaminated by oil or coolant leaks, the sensor can also behave erratically.
How P0113 is diagnosed and repaired
To restore proper fuel management, technicians verify the fault with live data, inspect the sensor and harness, and replace the faulty part if needed. The steps below outline a common approach:
- Use an OBD-II scanner to confirm P0113 and view live IAT sensor data, comparing it to ambient air temperature.
- Inspect the IAT sensor and its connector for dirt, corrosion, bent pins, or damaged wiring; unplug and reseat the connector.
- Check for damaged insulation, shorts, or open circuits in the IAT wiring; test continuity and resistance according to manufacturer specs.
- Test the 5V reference supply to the IAT sensor and verify proper ground connection; repair any voltage supply issues.
- Inspect for intake leaks or damaged ducting that could alter readings around the IAT sensor; repair as necessary.
- Clear fault codes and perform a road test to ensure the IAT data tracks actual air temperature and the vehicle runs smoothly.
- If the sensor or wiring tests fail, replace the IAT sensor; if tests indicate the PCM is at fault, consult a dealership- or specialist-level diagnostic service.
Repair costs vary by part and labor but replacing the IAT sensor is typically the most common and affordable fix; wiring repairs or harness replacements can increase costs. Always follow safety precautions and consult a qualified technician if you’re unsure.
Impact on emissions and long-term reliability
Because the IAT reading feeds into fuel trimming and ignition timing, leaving P0113 unresolved can hinder the engine’s ability to meet emissions standards during testing and may place additional stress on the catalytic converter if the engine runs too rich or too lean over extended periods.
Summary
In short, ignoring P0113 on a Ford can lead to poorer performance, reduced fuel economy, and higher emissions, with a real risk of drivability issues escalating over time. Start with a sensor and wiring check, then address any faults in the IAT circuit. If you’re unsure, seek a certified mechanic to prevent potential collateral damage to the engine or emissions system.
What happens if you don't fix the P0113 code on a Ford?
The problem is that if you ignore the MIL light with a P0113 code and keep driving, and then there's a sudden cold snap (like a crisp 40 degree morning), the Engine Coolant Temperature (ECT) sensor will be reading 40 degrees F and the IAT will still be reading 101 degrees F.
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How much does it cost to replace an IAT sensor?
between $111 and $134
The average cost for an Intake Air Temperature (IAT) Sensor Replacement is between $111 and $134. Labor costs are estimated between $48 and $70 while parts are priced between $63 and $64. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
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Is it okay to drive with a P0113 code?
Driving with the P0113 error code is not advisable. While the vehicle may still operate, the incorrect air-fuel mixture can lead to reduced performance, higher emissions and increased fuel consumption.
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Can you drive with a bad intake air temperature sensor?
It is generally possible to drive with a defective IAT sensor, but we don't recommend doing so. We advise having it checked, repaired, or replaced to ensure the optimum operation of your vehicle.
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