Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 High (Generic)
The P4006 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 High (Generic). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light on
- False high temperature at DPF outlet
- Excessive DPF regeneration attempts
- Poor fuel economy
- Engine power limitation
Probable Causes (Ranked by Likelihood)
- Short to power in EGT sensor 2 circuit Very High
- Faulty EGT sensor 2 reading high High
- Wiring damaged by exhaust heat Moderate
- Reference voltage circuit fault Low
Step-by-Step Diagnostic Procedure
-
Check EGT sensor 2 signal voltage against specifications
-
Inspect wiring for shorts to battery voltage or other circuits
-
Test sensor resistance and compare to temperature chart
-
Verify 5V reference and ground circuits at sensor connector
Frequently Asked Questions
Will P4006 damage my DPF?
Not directly, but the false high reading may cause the PCM to skip needed regeneration cycles, which can lead to DPF clogging over time.
Can I drive with P4006?
You can drive short distances but fuel economy may be poor due to the system reacting to false temperature data. Have it repaired within a few days.
What causes wiring damage near the DPF?
The DPF operates at extremely high temperatures during regeneration, often over 1000 degrees F. Wiring routed too close can have insulation melt or degrade over time.
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