P0547: Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1

What it means

The control module detects an electrical fault in the Bank 2 Sensor 1 exhaust gas temperature sensor circuit.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

Bank 2 Sensor 1 is an exhaust gas temperature sensor at the first monitored position on the engine's Bank 2 exhaust side. The control module sets P0547 when it detects an electrical fault in that sensor's circuit, but the code does not identify a specifically low or high signal.

Common causes

Most likely first.

1. Exhaust gas temperature sensor failure
2. Open or short in sensor wiring
3. Loose, damaged, or corroded connector

Symptoms

• Check-engine light on
• Possible reduced engine power or altered exhaust-system operation

How to diagnose it

1. Record freeze-frame data and compare Bank 2 Sensor 1 live data with other exhaust temperature readings, if the scan tool provides them.
2. With the exhaust cool, inspect the Bank 2 Sensor 1 connector and wiring for corrosion, loose pins, heat damage, or chafing.
3. Check the harness routing and connector terminals for an open or short using the vehicle wiring diagram.
4. Test the Bank 2 Sensor 1 sensor and its circuit using the manufacturer's procedure to isolate the electrical fault.
5. After repair, clear the code and confirm that Bank 2 Sensor 1 temperature changes plausibly as the exhaust warms.

Common fixes

• Reconnect or clean the Bank 2 Sensor 1 connector if loose or corroded.
• Repair damaged, chafed, or open Bank 2 Sensor 1 wiring.
• Replace the Bank 2 Sensor 1 exhaust temperature sensor if it fails circuit testing.
• Repair a faulty connector terminal or circuit connection found during diagnosis.

Can I keep driving?

If the vehicle has reduced power or changed exhaust-system operation, limit driving and avoid heavy loads or sustained high speeds. The fault can make Bank 2 exhaust temperature monitoring unreliable.