Exhaust Gas Temperature Sensor 3 Bank 1 Out of Range
The P247A code indicates that the exhaust gas temperature (EGT) sensor 3 on bank 1 is reporting a value outside the expected range. This sensor monitors exhaust temperature to protect the catalytic converter and diesel particulate filter (DPF) from overheating. The out-of-range condition can be caused by a faulty sensor, wiring issues, or actual exhaust temperature extremes. If ignored, it may lead to reduced engine performance, increased emissions, or damage to exhaust components.
1. Most Common Causes
- Faulty exhaust gas temperature sensor 3
- Damaged or corroded wiring/connector
- Exhaust leak near the sensor
- Engine running too hot (overheating)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Possible DPF regeneration issues
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect EGT sensor 3 and its wiring for damage or corrosion.
Step 3: Compare sensor reading with live data; if out of range, test sensor resistance and voltage.
Step 4: Check for exhaust leaks near the sensor and verify engine coolant temperature is normal.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances, as it may cause damage to the catalytic converter or DPF. Limp mode may limit speed.
How much does it cost to fix?▼
Replacing the sensor typically costs $150-$400 including parts and labor. Diagnosis may add $50-$100.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.