P246E: Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 4
The P246E code indicates a problem with the exhaust gas temperature (EGT) sensor circuit for Bank 1, Sensor 4. This sensor monitors exhaust temperature to protect the diesel particulate filter (DPF) and other aftertreatment components. The fault typically arises from a short or open in the sensor circuit, a faulty sensor, or wiring issues. It can lead to incorrect temperature readings, affecting DPF regeneration and potentially causing reduced engine performance or increased emissions.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- Engine control module (ECM) software or hardware issue
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- DPF regeneration issues or frequent regen cycles
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for short or open circuits in the wiring harness using a multimeter.
Step 5: If wiring and sensor are okay, test the ECM output or update software as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to DPF damage or reduced engine performance. Limp mode may activate, limiting speed. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts (sensor $50-$150) and labor ($100-$250). Diagnostic fees may add $50-$100.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.