Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1)
The P0549 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the exhaust gas temperature (EGT) sensor located on Bank 2, Sensor 1 (pre-catalyst). This sensor monitors exhaust temperature to protect the catalytic converter and DPF from overheating. A high voltage reading typically means the sensor circuit has an open, short to power, or the sensor itself is faulty. This can lead to incorrect fuel mixture, reduced engine performance, and potential damage to emission components if ignored.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- ECM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Possible overheating of catalytic converter
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor resistance and voltage with a multimeter; compare to manufacturer specs.
Step 4: If sensor is faulty, replace it; if wiring issue, repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause catalytic converter or DPF damage. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on sensor location and labor rates.