Exhaust Gas Temperature Sensor Circuit Malfunction (Bank 2 Sensor 1)
The P0547 code indicates a problem with the exhaust gas temperature (EGT) sensor circuit for Bank 2, Sensor 1. This sensor monitors the temperature of exhaust gases to protect the catalytic converter and diesel particulate filter (DPF) from overheating. The Engine Control Module (ECM) detects a voltage or resistance outside the expected range, often due to a faulty sensor, wiring issues, or exhaust leaks. On diesel engines, this can lead to DPF regeneration problems and reduced engine performance.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor or ECM
- Exhaust leaks near the sensor
- Corroded or damaged sensor connector
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- DPF regeneration issues (on diesel engines)
- Excessive exhaust smoke
03. Step-by-Step Diagnosis
Step 1: Connect an OBD2 scanner and confirm the P0547 code. Check for additional codes.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the sensor's resistance and compare to manufacturer specifications.
Step 4: Check for exhaust leaks near the sensor that could affect readings.
Step 5: If wiring and sensor appear okay, test the circuit at the ECM connector for continuity and shorts.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to catalytic converter or DPF damage. You may experience reduced power and fuel economy. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The sensor itself costs $50-$150, and labor adds $100-$250 depending on accessibility.