P0549
PPowertrainExhaust Gas Temperature Sensor Circuit High (Bank 2)
What does this code mean?
Severity : MediumP0549 reports a high voltage on the exhaust gas temperature sensor circuit, bank 2 sensor 1 (the one closest to the engine or turbo). The control module uses this reading to protect the turbocharger, catalytic converter or diesel particulate filter. A high voltage usually points to an open circuit.
Symptoms
- Check engine light on.
- Possible loss of power or limp mode.
- Disturbed DPF regenerations on a diesel.
- Implausible exhaust temperature in live data.
Possible causes
- Failed exhaust gas temperature sensor (often open).
- Broken or heat-damaged wire near the exhaust.
- Corroded or heat-distorted connector.
- Short to voltage in the harness.
- Faulty control module, less often.
Diagnosis and repair
- Inspect the sensor harness and connector, especially near hot parts.
- Compare the sensor reading with other temperature sensors on a cold engine.
- Measure sensor resistance with a multimeter against manufacturer values.
- Replace the sensor or repair the wiring.
- Clear the code and road test.
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Code
P0549
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012