P247B
Exhaust Gas Temperature Out of Range Bank 1 Sensor 4
Exhaust temperature / emissions
Generic OBD-II
Medium
What it means
P247B means the exhaust gas temperature (EGT) sensor at bank 1, sensor 4 is reporting a value outside the range the ECM considers valid. EGT sensors track exhaust heat to protect the turbo and particulate filter and to control diesel regeneration. The car usually still drives, but the ECM cannot rely on that reading until the sensor or its circuit is repaired.
Medium
Can I keep driving? Usually yes — the car drives, but on diesels a faulty EGT reading can block particulate-filter regeneration, so fix it before the filter clogs.
Common symptoms
What you'll notice
- Check-engine light on
- On diesels, incomplete or skipped particulate-filter regeneration
- Possible reduced power or limp mode on some vehicles
- Higher exhaust emissions
Common causes
Most likely first
- Aged or failing EGT sensor reading outside its valid rangeLikely
- Wiring or connector fault at the sensorCommon
- Exhaust leak near the sensor distorting the temperatureCommon
- ECM fault (least common)Less often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to capture the conditions.
- View EGT live data at a cold start — all sensors should read near ambient temperature.
- Inspect the bank 1, sensor 4 connector and wiring, and check for exhaust leaks nearby.
- Replace the EGT sensor if it reads out of range versus the others.
- Clear the code and re-test; consider the ECM only after wiring and sensor check good.
FAQ
Quick answers
Is it safe to drive with P247B?+
Short term, usually yes. The main concern on diesels is that regeneration may stop and the particulate filter can clog over time. Repair it before that happens.
Can I just clear P247B?+
You can, but an out-of-range sensor will keep setting it. Diagnose the sensor and wiring first.
Related codes
Often seen with P247B
Read & clear P247B 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