An Air Charge Temperature (ACT) Sensor, also commonly known as a Manifold Air Temperature Sensors (MAT) or Intake Air Temperature (IAT) Sensor, measures the temperature of the air entering your engine. The sensor communicates with the engine control unit (ECU) so it can adjust fuel delivery and ignition timing for optimal performance, fuel efficiency, and emissions control.
How It Works:
- Typically mounted in the air intake system or intake manifold.
- Detects the temperature of incoming air and converts it into an electrical signal.
- The ECU uses this signal — along with other sensor data (like Mass Air Flow and Manifold Pressure) to calculate the correct air-fuel mixture.
- Accurate air temperature readings help the engine run smoothly in all weather conditions.
Product Features & Benefits from Walker Products:
- Exact OE Fit: Engineered as a direct OE replacement for easy installation.
- OE Replacement Quality: Built to meet or exceed OE specifications for performance.
- Durable Design: Resistant to heat, vibration, and contamination.
- Improved Engine Performance: Restores proper ignition timing and fuel efficiency.
- Trusted in the Aftermarket: Backed by over 75 years of experience supplying quality automotive sensors.
Symptoms of a Failing Air Charge/Manifold/Intake Temperature Sensor may include:
- Rough idle or engine stalling
- Reduced fuel economy
- Hesitation or sluggish acceleration
- Hard starting in hot or cold conditions
- Higher exhaust emissions
- Check Engine Light (CEL) illumination
Common Check Engine Light (CEL) / OBD-II Codes
The following OBD-II codes are most commonly linked to this product type. On-Board Diagnostics (OBD) systems were first introduced in the late 1980s to monitor emissions, and by 1996, OBD-II became standard on all passenger vehicles. Later, requirements expanded to heavy-duty vehicles and engines, ensuring consistent monitoring across the industry.
The codes listed below are common references for Air Charge Temperature Sensors. They should be used as a general guide only as Walker Products will not be held responsible for any use of this information. Always consult a professional mechanic and follow vehicle manufacturer and EPA guidelines when diagnosing, replacing, or resetting components.
- P0070 – Ambient Air Temperature Sensor Circuit
- P0071 – Ambient Air Temperature Sensor Range/Performance
- P0072 – Ambient Air Temperature Sensor Circuit Low
- P0073 – Ambient Air Temperature Sensor Circuit High
- P0074 – Ambient Air Temperature Sensor Circuit Intermittent
- P0095 – Intake Air Temperature Sensor 2 Circuit
- P0096 – Intake Air Temperature Sensor 2 Circuit Range/Performance
- P0097 – Intake Air Temperature Sensor 2 Circuit Low
- P0098 – Intake Air Temperature Sensor 2 Circuit High
- P0099 – Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
- P009A – Intake Air Temperature / Ambient Air Temperature Correlation
- P00A5 – Intake Air Temperature Sensor 2 Circuit
- P00A6 – Intake Air Temperature Sensor 2 Circuit Range/Performance
- P00A7 – Intake Air Temperature Sensor 2 Circuit Low
- P00A8 – Intake Air Temperature Sensor 2 Circuit High
- P00A9 – Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
- P00AA – Intake Air Temperature Sensor 1 Circuit
- P00AB – Intake Air Temperature Sensor 1 Circuit Range/Performance
- P00AC – Intake Air Temperature Sensor 1 Circuit Low
- P00AD – Intake Air Temperature Sensor 1 Circuit High
- P00AE – Intake Air Temperature Sensor 1 Circuit Intermittent
- P0110 – Intake Air Temperature Sensor 1 Circuit
- P0111 – Intake Air Temperature Sensor 1 Circuit Range/Performance
- P0112 – Intake Air Temperature Sensor 1 Circuit Low
- P0113 – Intake Air Temperature Sensor 1 Circuit High