P2479
Exhaust Gas Temperature Out of Range Bank 1 Sensor 2
Exhaust gas temperature (EGT) sensor
Generic OBD-II
Low
What it means
P2479 means the bank 1, sensor 2 exhaust gas temperature reading has fallen outside the range the ECM considers plausible. That sensor helps control and protect the exhaust after-treatment, so the car keeps running, but an out-of-range value can disable regeneration or trigger reduced-power protection on diesel engines.
Low
Can I keep driving? Yes — the engine runs normally; the main risk is disabled exhaust regeneration or reduced-power protection on diesels, so repair it before it affects after-treatment.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in how the car drives
- On diesels, disabled regeneration or reduced-power protection
- Exhaust-temperature reading stuck implausibly high or low on a scan tool
Common causes
Most likely first
- Faulty exhaust gas temperature sensor (bank 1, sensor 2)Likely
- Heat-damaged wiring or connector near the exhaustCommon
- Poor or corroded electrical connectionCommon
- Sensor value implausible versus expected exhaust temperatureLess often
- Rarely, a genuinely abnormal exhaust temperatureLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and compare all EGT sensor readings.
- Inspect the sensor-2 connector and harness for heat damage or chafing.
- Measure sensor resistance and compare to specification.
- Replace the EGT sensor if the value is out of range.
- Clear the code and re-test while watching the live temperature.
FAQ
Quick answers
Is it safe to drive with P2479?+
Yes — it is a temperature-monitoring fault, not a no-start. Still, don't ignore it, as it can disable DPF regeneration on a diesel.
Can I just clear P2479?+
It returns once the ECM re-checks the sensor unless the sensor, wiring, or connection is repaired.
Related codes
Often seen with P2479
Read & clear P2479 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX