Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 Low (Generic)
The P4005 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 Low (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
- DPF regen temperature not verified
- Lower than expected exhaust temperature readings
- DPF may clog over time
Probable Causes (Ranked by Likelihood)
- Short to ground in EGT sensor 2 wiring Very High
- EGT sensor 2 reading incorrectly low High
- Corroded connector pins at sensor Moderate
- PCM ground circuit issue Low
Step-by-Step Diagnostic Procedure
-
Measure EGT sensor 2 signal voltage and resistance
-
Check wiring for shorts to ground between sensor and PCM
-
Inspect connector for corrosion or heat damage
-
Compare sensor 2 reading to expected DPF outlet temperature
Frequently Asked Questions
What happens if DPF regen cannot verify temperature?
The PCM uses the post-DPF EGT sensor to confirm regeneration was successful. Without accurate data, the system may repeat regen attempts or disable the process entirely.
Can I drive with P4005?
You can drive short distances. However, repeated failed regeneration attempts will eventually clog the DPF, leading to a much more expensive repair.
How urgent is P4005?
Address it within a few days. Each time the DPF cannot verify regeneration, more soot accumulates. Once the DPF is fully clogged, it may need replacement at $2000-5000.
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