P2479: Exhaust Gas Temperature Out of Range — Bank 1 Sensor 2
What to do
As P2478 — companions decide whether this is a sensor errand or a regeneration event worth prompt attention.
What this code means
The second sensor's temperature is out of range — P2478's fork at the next position down the pipe, where "real" usually means a regeneration event: sensor 2 typically brackets the filter, and an out-of-range reading during a burn is the P2428 territory the supervision exists for. Alone and cold, it is the drift story as ever.
Likely causes
Start here
- Sensor drifted out of calibration · moderate
- Faulty exhaust gas temperature sensor · moderate
Less common
- Exhaust heat damage to sensor harness · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P2479.