P0547Generic code

P0547 Code: Exhaust Gas Temperature Sensor Circuit (Bank 2)

The P0547 code means the computer found an electrical fault in the exhaust gas temperature sensor circuit (bank 2, sensor 1). The main effect is reduced exhaust protection. A damaged or corroded connector is the most common cause, so start there.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$60 to $400
Difficulty
Medium
System
Emissions Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0547 code means

This sensor does the same job as the bank 1 sensor, but on the side opposite cylinder 1 on V engines, or as a second measuring point on some diesels.

The sensor changes its resistance with temperature, and the computer reads the resulting voltage. A circuit fault, which is what the P0547 code reports, can come from the sensor, from the wiring or from the supply.

Without the signal, the computer cannot protect that side of the exhaust or control the regeneration properly. The sensor profile pages explain how to test one.

Always start with the simple things: the fuse, the relay and the connector. Then check the supply, the ground and the signal with the component plugged in (using back-probes), and finally the continuity of each wire all the way to the computer. Only replace the component if all of that checks out.

P0547 code symptoms

  • Check engine light on.
  • Reduced exhaust protection.

Likely causes of the P0547 code

  1. Damaged or corroded connector. The most frequent cause.
  2. Wiring cut or shorted between the sensor and the computer.
  3. Failed sensor. Open or shorted inside.
  4. Missing supply reference. Check whether other sensors are also failing.
  5. Computer. Uncommon, so rule out everything above first.

How to diagnose the P0547 code step by step

  1. Read the sensor value on the scan tool and compare it with what you expect.
  2. Inspect the connector for corrosion, water or loose pins.
  3. Check the supply and ground with the key on: the reference should be correct, with less than 0.1 V of voltage drop on the ground.
  4. Measure the signal with the connector plugged in and watch whether it changes with the condition.
  5. Do a wiggle test on the harness with the scan tool in graph mode.
  6. Check the continuity of each wire to the computer (under 1 ohm).

How to fix the P0547 code

  • Repair the connector or the wiring.
  • Replace the sensor if the tests confirm it is bad.
  • Correct the real condition if there is one.
  • Clear the codes and verify with a road test.

Technical reference data

  • PT200 platinum resistance element or thermocouple.
  • These values are a general guide: check the manufacturer data for your vehicle.

Brand-specific notes

Bank 2 codes show up on V6 and V8 diesels, which have an exhaust sensor on each side of the engine.

P0547 on Ford

Shows up on Ford V6 and V8 diesels.

P0547 on Mercedes

Shows up on Mercedes V6 and V8 diesels.

P0547 on BMW

Shows up on BMW V6 and V8 diesels.

Frequently asked questions about P0547

What does the P0547 code mean?
It is a generic OBD2 code that means the computer found an electrical fault in the exhaust gas temperature sensor circuit on bank 2, sensor 1. Exhaust protection is reduced as a result.
Can I drive with a P0547 code?
Yes, with some caution. The vehicle drives, but the computer cannot protect that side of the exhaust properly, so get it checked soon.
Do I have to replace the sensor?
Only if the tests confirm it. The connector and the wiring fail just as often.
What does the bank 2 EGT sensor do?
It does the same job as the bank 1 sensor, but on the side opposite cylinder 1 on V engines, or as a second measuring point on some diesels.
How much does it cost to fix P0547?
As a rough guide, between $60 and $400. A connector repair is at the low end, and a new sensor with labor is at the high end.
Will a P0547 code clear itself?
Only if the fault was temporary. A corroded connector or a damaged wire will bring the P0547 code back, so find the cause before you clear it.
What is the most common cause of P0547?
A damaged or corroded connector. Wiring that is cut or shorted and a failed sensor come next.

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