P0547 Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1

P0547 indicates an exhaust gas temperature sensor circuit issue on Bank 2 Sensor 1. The controller cannot trust the upstream Bank 2 EGT input.

Code details

Generic OBD-II · P0

System: Speed / Idle
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not assume both banks have the same fault; compare Bank 2 data against Bank 1 and actual operating conditions.

Symptoms of P0547

Unstable, high, or low idle, or stalling.
Erratic speedometer, cruise-control, or shift behaviour.
Check-engine light with a hesitation or surge.

Common causes of P0547

A dirty throttle body, idle-control valve, or throttle-position sensor.
A failing vehicle-speed or wheel-speed sensor, or its wiring.
Vacuum leaks or a related sensor forcing the idle/speed strategy.

Useful checks before replacing parts

Compare Bank 2 Sensor 1 EGT data with Bank 1, ambient temperature, engine load, exhaust flow, catalyst or DPF status, and freeze-frame conditions.
Inspect sensor wiring near exhaust heat, connector condition, bias or reference circuit, ground path, sensor mounting, and impact or soot damage.
Check cold-start plausibility and warm response to verify the sensor tracks Bank 2 exhaust temperature.

Related OBD-II codes

These nearby speed / idle entries can help compare wording and pin down the fault area.