Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 1)
The P0547 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 1). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Bank 2 turbo protection activated
- Reduced engine power
- DPF management issues
Probable Causes (Ranked by Likelihood)
- Failed exhaust gas temperature sensor on Bank 2 Very High
- Heat-damaged wiring on Bank 2 exhaust side High
- Corroded EGT sensor connector on Bank 2 Moderate
- ECM Bank 2 EGT input circuit failure Low
Step-by-Step Diagnostic Procedure
-
Compare Bank 2 EGT sensor 1 reading to Bank 1 EGT sensor 1 at same operating conditions
-
Inspect Bank 2 EGT sensor wiring for heat damage or chafing
-
Measure sensor resistance and compare to Bank 1 sensor at the same ambient temperature
-
Check connector for corrosion or heat damage specific to the Bank 2 side
Frequently Asked Questions
Why does Bank 2 have a separate EGT sensor?
On V-configuration engines, each bank has its own exhaust manifold and potentially its own turbocharger. Separate EGT sensors on each bank allow the ECM to monitor exhaust temperatures independently for balanced operation.
Can I swap Bank 1 and Bank 2 EGT sensors for testing?
If the sensors are the same part number and physically interchangeable, swapping them is a valid diagnostic step. If the code follows the sensor, the sensor is faulty. If the code stays on Bank 2, the wiring or ECM input is the issue.
Is P0547 related to turbo failure?
P0547 does not indicate turbo failure, but the ECM uses EGT data to protect the turbocharger. Without accurate Bank 2 temperature data, the ECM may limit boost pressure on that bank as a precaution.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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