P246F: Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 4
The P246F code indicates that the Engine Control Module (ECM) has detected a signal from the Exhaust Gas Temperature (EGT) sensor 4 on Bank 1 that is outside the expected range or performance parameters. This sensor is typically located downstream of the diesel particulate filter (DPF) or selective catalytic reduction (SCR) system. The ECM monitors the sensor's voltage and compares it to expected values based on engine operating conditions. A range/performance issue suggests the sensor is reading incorrectly, possibly due to internal failure, wiring issues, or contamination. This can affect emissions control and regeneration processes.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Wiring or connector issues (open, short, corrosion)
- Exhaust system leaks near the sensor
- ECM software or calibration error
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible regeneration issues in diesel vehicles
- Increased exhaust emissions
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional related codes.
Step 2: Visually inspect the EGT sensor 4 wiring and connector for damage, corrosion, or loose connections.
Step 3: Measure the sensor resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for exhaust leaks near the sensor that could affect readings.
Step 5: Clear the code and test drive to see if it returns; if so, replace the sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but prolonged driving may cause reduced fuel economy, increased emissions, and potential damage to the DPF or SCR system. It is recommended to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for the sensor part, plus labor if you have a mechanic install it. DIY replacement can save on labor costs.