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 for Bank 1. 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, high resistance, or a short to voltage in the sensor or its wiring.
01. Most Common Causes
- Faulty Intake Air Temperature Sensor 2
- Open or shorted wiring in the IAT sensor circuit
- Poor electrical connection at the sensor connector
- Corrosion or damage to the sensor terminals
- ECM malfunction (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor engine performance or hesitation
- Rough idle or stalling
- Increased fuel consumption
- Black smoke from exhaust (rich condition)
03. 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 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 various temperatures.
Step 4: Check the voltage signal at the sensor connector with the ignition on; should be around 5V reference and a varying signal voltage depending on temperature.
Step 5: If sensor and wiring are okay, test the ECM by checking continuity and signal at the ECM connector.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances with this code as it can cause poor engine performance, increased emissions, 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 for parts and labor, depending on the vehicle and whether the sensor or wiring needs replacement.