P0544 to P0549: exhaust gas temperature sensors
An exhaust gas temperature sensor, sensor 1 on bank 1 or bank 2, has a circuit fault or reads low or high.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P0544 mean?
Exhaust gas temperature sensors measure how hot the gases are, usually ahead of the turbocharger or the particulate filter. The engine computer uses them to protect the turbo and the catalytic converter from overheating and, on diesels, to manage particulate filter regeneration. If a sensor fails, the computer limits power or stops regenerating, and the particulate filter can then clog with soot.
What causes P0544?
- A failed temperature sensor, worn out by heat and vibration
- A sensor wire chafed or melted where it runs along the exhaust
- A corroded connector in the hot area near the turbocharger
- A sensor that cracked after a sudden cold shock such as driving through water
What to check first for P0544
- Inspect the sensor's wire along the exhaust for chafing and melted insulation
- With the engine cold, compare the exhaust temperature readings with the outside temperature
- Look for particulate filter or turbo codes stored at the same time
- Inspect the sensor's connector for corrosion and a loose latch
Can you drive with P0544?
Usually you can drive to a workshop. Expect reduced power on some cars; if the particulate filter warning comes on too, do not ignore it, because a clogged filter can need an expensive repair.
In states with an OBD-II emissions inspection, a car with the check engine light on fails the test until the fault is fixed.
Codes on this page
- P0544Exhaust Gas Temperature Sensor Circuit
- P0545Exhaust Gas Temperature Sensor Circuit LowBank 1 Sensor 1
- P0546Exhaust Gas Temperature Sensor Circuit HighBank 1 Sensor 1
- P0547Exhaust Gas Temperature Sensor CircuitBank 2 Sensor 1
- P0548Exhaust Gas Temperature Sensor Circuit LowBank 2 Sensor 1
- P0549Exhaust Gas Temperature Sensor Circuit HighBank 2 Sensor 1
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
