Exhaust Gas Temperature Sensor Out of Range Bank 2 Sensor 4
The P247F code indicates that the exhaust gas temperature (EGT) sensor located after the diesel particulate filter (DPF) on Bank 2, Sensor 4, is reporting a temperature reading outside the expected range. This sensor monitors exhaust temperature for DPF regeneration and emissions control. An out-of-range condition can be caused by a faulty sensor, wiring issues, or exhaust system problems.
1. Most Common Causes
- Faulty EGT sensor (Bank 2 Sensor 4)
- Damaged or corroded wiring/connector
- Exhaust leak near the sensor
- DPF regeneration issues causing extreme temperatures
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel efficiency
- Possible limp mode or reduced engine power
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor and wiring for damage or corrosion.
Step 3: Compare sensor readings with a scan tool to expected values at idle and under load.
Step 4: Check for exhaust leaks near the sensor using a smoke machine or visual inspection.
Step 5: If wiring and exhaust are okay, replace the EGT sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to DPF damage or reduced engine performance. Short trips to a repair shop are okay.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400 including parts and labor, depending on vehicle make and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.