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 response time; if the signal is erratic, slow, or out of range, it sets this code. Common causes include a faulty sensor, wiring issues, exhaust leaks, or contamination from soot or moisture.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring/connector
- Exhaust system leaks near the sensor
- Sensor contamination (soot, oil, coolant)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible regeneration issues (DPF)
- Decreased engine performance
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor 4 wiring and connector for damage or corrosion.
Step 3: Compare sensor resistance and voltage readings to manufacturer specifications using a multimeter.
Step 4: Check for exhaust leaks near the sensor location.
Step 5: If all else is normal, replace the EGT sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but prolonged driving may cause reduced fuel economy, DPF clogging, or further damage to emission components. It's best 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 shop do it. DIY replacement is straightforward on many vehicles.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.