Faulty Bank 2 Sensor 1 exhaust gas temperature sensor; Damaged, chafed or heat-affected wiring to the sensor, causing a short or open circuit; Corroded, loose or contaminated connector at the sensor or control unit; Exhaust leak near the sensor affecting readings, or sensor contaminated by soot or coolant; Reference voltage or earth supply fault to the sensor; Fault inside the control unit; Outdated control unit software where the manufacturer lists it as a known cause for this model.

P0547

Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
47: FaultThe specific fault in that area

What it means

P0547 is the generic code for a fault in the exhaust gas temperature (EGT) sensor circuit on Bank 2, Sensor 1, which is normally the sensor closest to the engine on the side without cylinder number one. The control unit sets it when the signal voltage from that sensor is outside the expected range or does not make sense, which points to a circuit or sensor fault. Sensor position and the exact set condition vary by model and engine, so confirm against the manufacturer data.

Symptoms

Engine warning light on
Reduced power or the engine going into a limp mode on some vehicles
Diesel particulate filter regeneration not completing or happening more often, where fitted
Turbo or exhaust protection strategies reducing boost on some engines
Possible extra fault codes for other exhaust temperature sensors or the particulate filter
Often no obvious change in how the car drives

Possible causes

Faulty Bank 2 Sensor 1 exhaust gas temperature sensorlikely
Damaged, chafed or heat-affected wiring to the sensor, causing a short or open circuitlikely
Corroded, loose or contaminated connector at the sensor or control unitlikely
Exhaust leak near the sensor affecting readings, or sensor contaminated by soot or coolantpossible
Reference voltage or earth supply fault to the sensorpossible
Fault inside the control unitrare
Outdated control unit software where the manufacturer lists it as a known cause for this modelrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine load and temperature when the code set
Check for other exhaust temperature, particulate filter or boost codes that could point to a shared cause
Confirm which sensor is Bank 2 Sensor 1 on this engine using the manufacturer data, as layouts differ
Visually inspect the sensor, its wiring and routing for heat damage, chafing, and exhaust leaks
Check the connector for corrosion, bent pins, moisture and a secure fit
Compare the live sensor reading with other exhaust temperature sensors on a cold engine; they should be similar to ambient and to each other
Test the sensor circuit for supply, signal and earth, and check sensor resistance against the specification for that model
Check for wiring continuity and shorts between the sensor and the control unit

How to fix

Replace the Bank 2 Sensor 1 exhaust gas temperature sensor if it fails the specification checks
Repair or replace damaged wiring and secure it away from hot exhaust parts
Clean or replace corroded connectors and terminals
Repair any exhaust leak affecting the sensor area
Update the control unit software only if the manufacturer identifies it as a known cause
After repair, clear the code and road test to confirm it does not return

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but book it in soon because the exhaust and particulate filter may not be protected properly. If power is reduced or the car is in limp mode, limit driving until it has been checked.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.