Diesel Throttle Valve Position Sensor Circuit High (Generic)
The P4098 code means the vehicle's onboard diagnostic system has detected: Diesel Throttle Valve Position Sensor Circuit High (Generic). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $350 (parts and labor)
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Common Symptoms
- Check Engine Light on
- False high throttle valve reading
- EGR flow restricted unnecessarily
- Higher NOx emissions
- Engine may idle rough
Probable Causes (Ranked by Likelihood)
- Short to voltage in sensor circuit Very High
- Sensor failure reading high High
- Wiring damaged near intake Moderate
- Reference voltage issue Low
Step-by-Step Diagnostic Procedure
-
Check sensor voltage with valve in known position
-
Disconnect sensor and test for stray voltage
-
Inspect wiring for shorts
-
Verify reference and ground circuits
Frequently Asked Questions
Will P4098 increase NOx emissions?
Yes, if the PCM restricts EGR flow based on a false high reading, NOx emissions will increase.
Can I drive with P4098?
You can drive short distances. EGR flow control is impaired but the engine will run.
Is the throttle valve sensor replaceable separately?
On some vehicles yes, on others it is integrated into the throttle valve assembly.
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