P0098
Fix within 1-2 weeksThe engine computer detects a high voltage signal from Intake Air Temperature (IAT) Sensor 2, indicating an extremely cold temperature or an open circuit in the sensor or its wiring.
Code P0098 means your engine computer detects a high voltage from Intake Air Temperature Sensor 2. Common causes: Faulty IAT Sensor 2 (70%), wiring issues (25%). Drivability: Yes, safe to drive. Repair cost: $20-$200 DIY, $100-$350 professional.
Can I Drive With P0098?
Yes, safe to drive
No restrictions, but expect reduced fuel economy and performance.
Stop driving immediately if: Flashing CEL, significant power loss, or engine overheating (though unlikely with this code).
Symptoms of P0098
- 1Reduced engine performance
- 2Decreased fuel economy
- 3Rough idle
- 4Hard starting, especially in cold weather
- 5Check Engine Light illuminated
Common Causes of P0098
Parts most likely causing this code, ranked by probability
The IAT Sensor 2 itself is faulty and sends an incorrect high voltage signal to the engine computer.
70% of P0098 cases are fixed by replacing this part
An open circuit, corrosion, or damage in the wiring harness or connector prevents the correct signal from reaching the engine computer.
25% of P0098 cases are fixed by repairing this part
The engine computer has an internal fault that incorrectly interprets the IAT Sensor 2 signal.
5% of P0098 cases are fixed by replacing this part
Check These First (Before Buying Parts)
- Clear the code with an OBD-II scan tool and see if it immediately returns.
- Visually inspect the IAT Sensor 2 connector and wiring for any obvious signs of damage, corrosion, or loose connections. Ensure the sensor is securely plugged in.
How to Diagnose P0098
- 1Visually inspect IAT Sensor 2 and its wiring for any obvious damage, corrosion, or loose connections.
- 2Use a multimeter to check the resistance of the IAT Sensor 2 at various temperatures (if accessible and specifications are available).
- 3With the ignition on, check the voltage at the IAT Sensor 2 connector using a multimeter to ensure proper reference voltage and ground.
- 4Use an OBD-II scan tool to monitor the live data readings from IAT Sensor 2; compare it to IAT Sensor 1 (if present) and ambient air temperature.
- 5If the sensor tests good and wiring is intact, consider testing the ECM/PCM, though this is rare.
P0098 on Popular Vehicles
Ford F-150
2011-2024On EcoBoost engines, IAT Sensor 2 is typically located in the charge air cooler outlet pipe or intake manifold. It's a common failure point that causes P0098.
75% fixed by replacing IAT Sensor 2
Chevrolet Silverado
2014-2024Some Silverado models use a separate IAT Sensor 2 in the intake tract, often after the throttle body. Wiring issues to this sensor are also common.
70% fixed by replacing IAT Sensor 2
Honda Accord
2008-2024Depending on the engine, the IAT Sensor 2 might be integrated into the MAF sensor or a separate sensor in the intake manifold. Verify its location before purchasing parts.
65% fixed by replacing IAT Sensor 2
Frequently Asked Questions
What does P0098 mean?
P0098 indicates that your vehicle's engine computer is receiving a high voltage signal from the Intake Air Temperature (IAT) Sensor 2. This signal suggests the intake air is extremely cold or there's an open circuit in the sensor or its wiring.
Can I drive with P0098?
Yes, you can drive safely with P0098. The engine computer will use a default value for intake air temperature, which can lead to reduced fuel economy and engine performance. Fix this within 1-2 weeks to restore optimal engine operation.
Will P0098 clear itself?
No, P0098 will not clear itself. The engine computer stores this code until the underlying issue with the IAT Sensor 2 or its circuit is resolved. You will need to fix the problem and then clear the code with an OBD-II scan tool.
How do I fix P0098 myself?
Start by visually inspecting the IAT Sensor 2 and its wiring for damage. If the wiring is good, test the sensor's resistance with a multimeter. If the sensor is faulty, replace it. If the sensor is integrated into the MAF sensor, you will replace the entire MAF unit.
How much does it cost to fix P0098?
The cost to fix P0098 yourself is typically $20-$100 for a standalone IAT sensor, or $50-$200 if it's integrated with the MAF sensor. A professional repair at a shop will cost $100-$350, including parts and labor.
P0098 keeps coming back - why?
If P0098 keeps returning, it indicates the initial repair did not address the root cause. This often happens if the wiring or connector damage was overlooked, or if the problem is actually with the engine computer (a rare occurrence).
Will P0098 fail emissions/smog test?
Yes, P0098 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and the code itself indicates an issue with a monitored emissions-related sensor.
What's the difference between P0098 and P0097?
P0098 indicates an Intake Air Temperature Sensor 2 circuit 'High Input,' meaning the voltage signal is too high (suggesting very cold air or an open circuit). P0097 indicates a 'Low Input,' meaning the voltage signal is too low (suggesting very hot air or a short circuit).
P0098 on Ford F-150?
On many Ford F-150 models, especially those with turbocharged engines, IAT Sensor 2 is often located in the charge air cooler outlet or intake manifold. A common fix for P0098 on these trucks is replacing this specific IAT sensor, which can sometimes be a separate component from the MAF sensor.
Questions to Ask Your Mechanic
Did you check the resistance of the IAT Sensor 2 at different temperatures?
Good answer: Yes, I used a multimeter and compared the readings to the factory specifications. The sensor showed an open circuit/out-of-range resistance.
What did you find when inspecting the wiring harness to IAT Sensor 2?
Good answer: I found no visible damage or corrosion, and I performed a continuity test on the wires from the sensor to the ECM, which confirmed no open circuits.
Repair Cost Estimate
DIY Repair
Parts only
$20-$200
Shop Repair
Parts + labor
$100-$350
Save $80-$150 by doing it yourself
Difficulty
beginner
Time
0.5-1.5 hours
Beginner-friendly - Replacing an IAT sensor typically involves simple hand tools and is accessible for most DIYers.
Cost of Waiting
Ignoring P0098 means your engine runs with incorrect air temperature data. This leads to reduced fuel efficiency, poor engine performance, and increased emissions. While it won't cause immediate catastrophic failure, it will cost you more in fuel and can make your vehicle harder to start in cold weather.
While You're In There...
If accessing the intake tract, it's a good time to check and replace the air filter if it's dirty, as it impacts air flow and sensor readings.
If your IAT Sensor 2 is integrated into the MAF sensor, cleaning the MAF sensor can sometimes resolve issues, and it's a low-cost maintenance item.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Socket set or wrench set (depending on sensor mounting)
- Flathead screwdriver (for hose clamps, if applicable)
P0098 is a common sensor code. The repair is usually straightforward, inexpensive, and your engine will run much better afterward.
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Your Next Steps
Step 1: Clear the code and perform a thorough visual inspection of the IAT Sensor 2 and its wiring for any damage or loose connections.
Step 2: If the visual inspection doesn't reveal the issue, use a multimeter to test the IAT Sensor 2's resistance and check for proper voltage at the connector.
Step 3: If the sensor tests faulty or the wiring is confirmed to be open, replace the IAT Sensor 2 (or the MAF sensor if integrated). You'll likely need a new IAT Sensor 2.