P0549 moderate

Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1)

The P0549 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1). This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $100 - $400 (parts and labor)

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Common Symptoms

Check Engine Light on
False high temperature warning on Bank 2
Unnecessary power reduction
Bank 2 turbo protection activated

Probable Causes (Ranked by Likelihood)

Open circuit in Bank 2 EGT sensor wiring Very High
Failed Bank 2 EGT sensor (open circuit) High
Disconnected Bank 2 EGT sensor Moderate
High-resistance corrosion in Bank 2 sensor circuit Moderate

Step-by-Step Diagnostic Procedure

Read Bank 2 EGT sensor 1 value; an extremely high reading with engine cold confirms open circuit
Check Bank 2 sensor connector for disconnection
Measure sensor resistance; an open circuit reading confirms failure
Compare to Bank 1 EGT sensor reading for reference

Frequently Asked Questions

What does circuit high mean for P0549?

Circuit high on an EGT sensor means the ECM reads maximum scale temperature due to an open circuit. The sensor or wiring has a break, causing the reference voltage to pull high and indicate an impossibly hot temperature.

Can I drive with P0549?

You can drive short distances, but the ECM may limit engine power on Bank 2 to protect the turbocharger and exhaust components. Extended driving in this condition may trigger additional fault codes related to exhaust aftertreatment.

Are Bank 1 and Bank 2 EGT sensors interchangeable?

Usually yes, if they share the same part number. However, some engines use sensors with different thread sizes or connector types depending on location. Always verify the part number before swapping sensors.