Exhaust Gas Temperature Sensor 2 Bank 1 Out of Range
The P2479 code indicates that the exhaust gas temperature (EGT) sensor 2 on bank 1 is reporting a temperature 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 due to engine misfires or excessive load.
1. Most Common Causes
- Faulty EGT sensor 2 bank 1
- Damaged wiring or connector to the sensor
- Exhaust leak near the sensor
- Engine misfire or rich fuel mixture causing high exhaust temps
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Possible overheating of catalytic converter or DPF
- Increased fuel consumption
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect EGT sensor 2 bank 1 wiring and connector for damage.
Step 3: Compare sensor reading with a known good sensor using a scan tool.
Step 4: Check for exhaust leaks near the sensor.
Step 5: Test sensor resistance and voltage per manufacturer specs.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as high exhaust temperatures can damage the catalytic converter or DPF, leading to costly repairs.
How much does it cost to fix?▼
Replacing the EGT sensor typically costs $150-$300 including parts and labor, depending on vehicle make and model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.