P0098 Trouble Code: Meaning, Symptoms, Causes & Fixes

If you’re seeing a P0098 trouble code pop up in your vehicle, you’re likely wondering what it means and how to resolve it.

In this guide, we’ll explore the technical specifics, common symptoms, and effective solutions to address this issue.

Having tackled this trouble code in the garage, I can share firsthand knowledge that simplifies your diagnostic journey.

We’ll specifically delve into how a P0098 code can affect your vehicle’s performance and the steps to troubleshoot it, including testing the Intake Air Temperature sensor and related components

Time to roll up our sleeves and get into the details.

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What Does P0098 Trouble Code Mean?

When your vehicle’s onboard diagnostics system triggers a P0098 trouble code, it’s indicating a problem with the Intake Air Temperature (IAT) Sensor 2.

This specific sensor is part of your engine’s management system, tasked with monitoring the temperature of the air entering the engine.

The data it collects helps the Engine Control Module (ECM) to optimize the air-fuel mixture and ignition timing, which are crucial for efficient engine performance.

A P0098 code sets off when the ECM perceives the voltage signal from the IAT Sensor 2 to be anomalously high, suggesting the temperature readings are implausibly low.

Such a discrepancy can be symptomatic of several issues: the sensor might be faulty, the electrical connection could be compromised, or there may be a short to the power supply in the sensor circuit.

Understanding this code is critical because the temperature of the air entering the engine affects its performance. Colder air is denser, containing more oxygen, which is ideal for combustion.

Conversely, warmer air, which the ECM might incorrectly calculate based on a faulty sensor reading, leads to a leaner mixture. This mix can cause the engine to run inefficiently, impacting performance and increasing emissions.

In essence, a P0098 trouble code could mean your vehicle’s engine is not running at its optimal temperature-based air/fuel mixture due to incorrect data being relayed by a compromised sensor.

Addressing this issue promptly will not only restore engine efficiency but also prevent potential long-term damage.

P0098 Trouble Code Symptoms

Experiencing a P0098 trouble code can lead to several noticeable symptoms that affect vehicle performance. Here’s what you might observe:

• Check engine light is illuminated on the dashboard
• Poor fuel economy
• Engine may run rough or hesitate during acceleration
• Possible engine overheating
• Reduced engine performance or power
• Increased emissions, potentially failing an emissions test

P0098 Trouble Code Causes

A P0098 trouble code can stem from a variety of issues within the engine’s intake air temperature system. Common causes include:

• Faulty or damaged intake air temperature sensor
• Corroded or poor electrical connections to the intake air temperature sensor
• Short to voltage in the intake air temperature sensor circuit
• Issues with the engine control module (ECM), though this is less common

How To Fix A P0098 Trouble Code

Addressing a P0098 trouble code involves a series of diagnostic checks and repairs to ensure the intake air temperature system is functioning correctly. Here’s a step-by-step guide to help you resolve this issue:

1. Scan and Document

Begin by using an OBD-II scanner to confirm the presence of a P0098 trouble code and to check for any other codes that might be present. Document all codes along with the freeze frame data for reference as you move through the diagnostic process.

2. Inspect the Sensor and Wiring

Visually inspect the intake air temperature sensor and its connections. Look for any signs of damage to the sensor itself, such as cracks or signs of burnout. Check the wiring leading to the sensor for signs of wear, fraying, or corrosion. Ensure all connections are tight and clean.

3. Check the Voltage

Use a multimeter to check the voltage at the intake air temperature sensor. Compare your findings with the specifications in your vehicle’s service manual. A higher-than-normal voltage reading typically indicates a problem.

4. Sensor Testing

If the wiring and connections are intact, test the sensor itself to determine if it is functioning within specification. You can do this by measuring its resistance with a multimeter and comparing it to manufacturer specifications. An out-of-specification resistance reading warrants replacement of the sensor.

5. Circuit Testing

If the sensor tests okay, the issue may be in the circuit. Check for shorts to power by disconnecting the sensor and checking for voltage on the signal wire with the ignition on. Presence of voltage here indicates a wiring issue between the ECM and the sensor.

6. Replace Faulty Components

Replace any faulty components found during the diagnostic tests. This may include the sensor itself, wiring harness, or connectors.

7. Clear the Code and Test Drive

After repairs, clear the trouble code from the ECM using the OBD-II scanner, then take the vehicle for a test drive to ensure that the issue is resolved and the check engine light does not reappear.

8. Further Diagnostics

If the problem persists after these repairs, it may be necessary to further investigate the ECM and other related components like the wiring harness for deeper electrical issues.

Following these steps should help you accurately diagnose and repair a P0098 trouble code, restoring your vehicle’s optimal performance.

Conclusion

Now that we’ve walked through what a P0098 trouble code signifies and the steps to fix it, you’re equipped to tackle this issue head-on.

Have you encountered this issue before in your vehicle?

Feel free to share your experiences or tips in the comments below!