Intake Air Temperature Sensor 1 Circuit Bank 2
The P00AA code indicates a malfunction in the intake air temperature (IAT) sensor 1 circuit for bank 2. This sensor measures the temperature of the air entering the engine and is critical for fuel mixture and ignition timing adjustments. The circuit includes the sensor, wiring, and the engine control module (ECM). A fault can cause incorrect air density calculations, leading to poor engine performance and increased emissions.
1. Most Common Causes
- Faulty intake air temperature sensor
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor or ECM
- Corroded or damaged connector pins
- Failed engine control module (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Poor fuel economy
- Black smoke from exhaust (rich mixture)
- Hard starting in cold weather
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the IAT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Measure the sensor resistance with a multimeter and compare to manufacturer specifications.
Step 4: Check the voltage signal at the ECM connector with the sensor connected.
Step 5: If all else is normal, replace the IAT sensor and clear the code.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor performance and increased emissions. Prolonged driving can damage the catalytic converter due to incorrect fuel mixture.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor. The sensor itself costs $20-$50, and labor is about $30-$100 depending on accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.