P2478
Exhaust Gas Temperature Out of Range Bank 1 Sensor 1
P2478 is an OBD-II diagnostic trouble code meaning: Exhaust Gas Temperature Out of Range Bank 1 Sensor 1. Common causes: exhaust gas temperature sensor malfunction, damage to the wiring or sensor connector. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Unusual odors from the exhaust system
- Engine overheating
Causes
- Exhaust gas temperature sensor malfunction
- Damage to the wiring or sensor connector
- Clogged catalytic converter
- Problems with the exhaust gas recirculation (EGR) system
- Engine overheating due to other faults
How to Fix
- Check the exhaust gas temperature sensor and its circuit
- Inspect the catalytic converter for blockages
- Check the engine cooling system
- Diagnose the EGR system
- Replace the faulty exhaust gas temperature sensor if necessary
Related codes
Error P2478 by Vehicle Brand
FAQ
What does the P2478 code mean?
P2478 is an OBD-II diagnostic trouble code that indicates: Exhaust Gas Temperature Out of Range Bank 1 Sensor 1
What causes a P2478 error code?
The most common causes of P2478 include: Exhaust gas temperature sensor malfunction; Damage to the wiring or sensor connector; Clogged catalytic converter; Problems with the exhaust gas recirculation (EGR) system.
How do I fix a P2478 diagnostic trouble code?
To fix P2478: Check the exhaust gas temperature sensor and its circuit. Inspect the catalytic converter for blockages. Check the engine cooling system. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2478?
Do not drive — repair immediately
How much does it cost to fix P2478?
The estimated repair cost for P2478 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat