P0549
Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1
Exhaust / emissions
Generic OBD-II
Medium
What it means
P0549 means the ECM sees an abnormally high voltage on the bank 2, sensor 1 exhaust gas temperature (EGT) sensor circuit, which usually points to an open or short-to-power in the sensor or its wiring rather than a genuinely hot exhaust. The EGT sensor protects the turbo and exhaust after-treatment, so on some diesels this can limit power until it's fixed.
Medium
Can I keep driving? Usually driveable, but some turbo-diesel vehicles drop into reduced-power/limp mode to protect the exhaust after-treatment, so get it checked promptly.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the car drives
- Reduced power or limp mode on some turbo-diesel vehicles
- Diesel particulate filter (DPF) regeneration may be disabled
Common causes
Most likely first
- Faulty exhaust gas temperature (EGT) sensor on bank 2, sensor 1Likely
- Open circuit or short to voltage in the sensor wiring (a high reading usually points here)Common
- Corroded or loose sensor connectorCommon
- High resistance in the signal or ground wireLess often
- Less commonly, a faulty ECMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to see when the fault set.
- Inspect the EGT sensor connector and wiring for opens, chafing, or a short to power.
- Measure the sensor's resistance and signal against the manufacturer's spec.
- Replace the EGT sensor if it is out of range.
- Repair any wiring faults, then clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P0549?+
Usually yes for short trips, but on turbo-diesels it can trigger reduced power to protect the DPF and turbo. Have it diagnosed soon.
Can I just clear P0549?+
You can, but it returns until the sensor or wiring fault is fixed. This is a monitoring sensor, so clearing it doesn't repair anything.
Related codes
Often seen with P0549
Read & clear P0549 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