What is error code P0098?
The P0098 fault code, applicable to all car manufacturers, means “Intake Air Temperature Sensor 2 Circuit High (Bank 1)“.
Background Information: The intake air temperature (IAT) sensor’s function is to transmit the engine’s intake air temperature to the electronic control unit (ECU) in the form of a voltage signal, providing a reference for fuel injection correction. This fault code appears if the electronic control unit (ECU) detects that the intake air temperature (IAT) sensor signal voltage is higher than the self-test maximum value (4.6 volts or -50 degrees Celsius).
Symptoms of Error Code P0098
The following symptoms may occur with error P0098:
- Difficulty starting the engine
- Unstable idle
- Increased fuel consumption
- Reduced power
- Engine malfunction indicator activated
Main Causes of Error Code P0098
- Intake air temperature sensor failure (IAT2)
- Open or short circuit in the sensor circuit
- Contamination of the sensor or intake passage
- ECM failure (less common)
How to Diagnose Error Code P0098?
- Connect a diagnostic scanner and read the error codes.
- Check the air temperature sensor (IAT2) parameters at idle and during warm-up.
- Perform a visual inspection of the wiring and sensor connectors.
- Measure the sensor’s resistance and compare it to the technical data.
- If necessary, replace the sensor or check the ECU for communication errors.
Possible Causes and Diagnostic Methods
| Possible Cause | How to Check? |
|---|---|
| IAT2 sensor failure | Measure resistance and compare with normal values |
| Open/short circuit wiring | Visually inspect and test the circuit with a multimeter |
| Sensor contamination | Inspect the sensor and clean if necessary |
| Electronic control unit failure | This will be checked by a diagnostic expert, and firmware will be checked if necessary |
Tools needed: OBD2 scanner, multimeter, sensor resistance technical data manual, connector removal tool kit
How to Fix Error Code P0098? (Fix Solution)
Simple Repair Methods
- Clean dirt and oxidation from the sensor connector.
- Check and repair damaged wires.
- Reset the error using a scanner after cleaning the contact points.
In-depth Diagnostic and Repair Solutions
- Replace the faulty IAT2 sensor.
- Check and restore power and signal circuits.
- Reprogram or replace the ECU if it is faulty.
Troubleshooting by Symptoms
| Symptom | Possible Solution |
|---|---|
| Poor engine starting | Check and replace the IAT2 sensor |
| Floating idle | Check and clean the sensor connector |
| Increased fuel consumption | IAT2 circuit diagnosis, sensor replacement |
| Check engine light on | Scan, replace sensor, or repair ECU |
Common P0098 Error Codes in Vehicles
Ford P0098: The error is usually caused by a sensor malfunction after air filter replacement or moisture entering the connector.
Chevrolet P0098: In some Cruze and Malibu models, this is due to worn wiring near the throttle body.
Volkswagen P0098: This is common in turbocharged models, especially when non-standard intake pipes are installed.
Nissan P0098: This occurs when the IAT2 sensor connector is worn, especially in high humidity conditions.
Toyota P0098: It is usually diagnosed along with other errors related to the intake system.
P0098 Frequently Asked Questions
Is it possible to drive with a P0098 error?
Not recommended. A malfunction of the air temperature sensor can lead to incorrect fuel supply, degraded performance, and increased fuel consumption.
Is the P0098 error serious?
Yes. Although the engine may continue to run, the error affects fuel efficiency and can cause starting and stability problems.
Can you reset the P0098 error yourself?
Yes, you can use a diagnostic scanner or temporarily disconnect the battery. However, the error will reappear if the cause is not addressed.
Which sensor causes the P0098 error?
The error is related to the Intake Air Temperature Sensor 2 (IAT2) located on the first cylinder bank.
What happens if you don’t fix the P0098 error?
Ignoring the error can lead to poor fuel economy, unstable engine operation, and increased exhaust emissions.
P0098 Related OBD2 Errors
P0097 – Intake Air Temperature Sensor Circuit Low Signal Level 2, Bank 1
P0111 – Intake Air Temperature Sensor Range/Performance Problem
P0113 – Intake Air Temperature Sensor High Signal
Important! Error P0098 may temporarily disappear due to poor contact, but this does not mean the problem is solved. Recurrence of the error is common. Do not delay diagnosis. Even if the machine is working normally, the error may trigger more serious malfunctions.