P0112 Lexus Code - Intake Air Temperature Circuit Low Input
Quick Answer
The P0112 diagnostic trouble code (DTC) for Lexus vehicles refers to the Intake Air Temperature Circuit Low Input. Common causes include Faulty or damaged IAT sensor, Loose or corroded wiring/connectors in the IAT sensor circuit, Malfunctioning ECM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0112 Lexus indicates Intake Air Temperature Circuit Low Input.
- Common causes
- Common causes include Faulty or damaged IAT sensor, Loose or corroded wiring/connectors in the IAT sensor circuit, Malfunctioning ECM.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0112 Lexus Description
The P0112 diagnostic trouble code (DTC) for Lexus vehicles refers to the Intake Air Temperature Circuit Low Input. This code indicates that the Engine Control Module (ECM) has detected a lower than expected voltage signal from the Intake Air Temperature (IAT) sensor circuit. The IAT sensor is responsible for measuring the temperature of the air entering the engine. This information is crucial for the ECM to calculate the correct air-fuel mixture for combustion in the engine. When the ECM receives a low input signal from the IAT sensor, it can lead to incorrect fuel delivery, ignition timing, and overall engine performance.
Common Causes of P0112 Lexus
- Faulty or damaged IAT sensor
- Loose or corroded wiring/connectors in the IAT sensor circuit
- Malfunctioning ECM
- Issues with the intake air temperature sensor's reference voltage
Symptoms of P0112 Lexus
- Decreased fuel efficiency
- Rough idling or stalling
- Engine hesitation or surging
- Check Engine Light illuminated
How to Fix P0112 Lexus
- Perform a visual inspection of the IAT sensor, wiring, and connectors for any visible damage or corrosion.
- Test the IAT sensor using a multimeter to check for proper resistance values and voltage output.
- Replace the IAT sensor if it fails the resistance/voltage tests.
- Check and repair any damaged wiring or connectors in the IAT sensor circuit.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix P0112 Lexus
The cost estimate for repairing a P0112 code on a Lexus vehicle can vary depending on the specific cause of the issue. Generally, the cost of replacing an IAT sensor ranges from $50 to $150, excluding labor costs. If wiring repairs or ECM replacement are necessary, the total repair cost could range from $150 to $500 or more. Additionally, labor rates at auto repair shops typically range between $80 and $150 per hour. It is advisable to consult with a professional mechanic for a more accurate cost estimate based on your vehicle's make and model.
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