Intake Air Temperature Sensor 2 Circuit High Bank 1
The P0098 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the Intake Air Temperature (IAT) Sensor 2 that is higher than the expected range. This sensor is typically located in the intake air duct or manifold and measures the temperature of the air entering the engine. A high voltage reading usually means the sensor is reporting an extremely low temperature or there is an open circuit. This can affect air-fuel mixture calculations, leading to performance issues.
1. Most Common Causes
- Faulty Intake Air Temperature Sensor 2
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor connector
- Corroded or damaged terminals
- ECM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor engine performance or hesitation
- Reduced fuel economy
- Hard starting in cold weather
- Black smoke from exhaust (rich mixture)
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the IAT sensor 2 connector and wiring for damage, corrosion, or loose connections.
Step 3: Disconnect the sensor and measure its resistance with a multimeter; compare to manufacturer specifications at known temperatures.
Step 4: Check for voltage at the sensor connector with the ignition on; should be around 5V reference signal.
Step 5: If sensor and wiring are okay, test the ECM output or replace the sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but prolonged driving may cause poor fuel economy, reduced performance, and potential damage to the catalytic converter due to incorrect air-fuel mixture.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts (sensor $20-$60) and labor (0.5-1 hour).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.