Mercedes-Benz vehicles such as GL, ML, R, and Sprinter equipped with diesel engines (including Bluetec) may trigger the check engine light, which fault codes such as P0544, P0546, P2201, or P2031 pointing to a bad Exhaust Gas Temperature Sensor Circuit.

Mercedes component b19 twc temperature sensor has plausibility error

If data is read from the sensor, you may get an error sensor out of range and a code for B19, B19/9, and B19/11, also known as TWC temperature sensor, error code 249 f. Even if you clear the code, it usually returns after a few days. In a few cases, the vehicle may go into limp mode when this fault code is triggered.

The sensor may work as designed when it cools down, but it does not provide the correct temperature reading once the engine and catalytic converter warm up. To diagnose the sensor’s performance, allow the engine to warm up to operating temperature. The temperature from these sensors should be in the 450 to 700 degree F range.

A defective exhaust temperature sensor often causes this problem (also known as B19, B19/9, which may have various part numbers such as A005 153 40 28 or A007 153 74 28, A 005-153-45-28, A 007-153-63-28. Call your Mercedes-Benz dealer and provide the VIN to verify the part number. The typical cost to change one of the sensors ranges from $300 to $480. Your Mercedes-Benz can have up to four sensors. Built upon the sensor can hinder its performance. The sensor can be replaced, or cleaning the sensor can sometimes fix this problem.


The YOUCANIC Full System Scanner can read and clear fault codes through every control module of your Mercedes-Benz vehicle.

What you will need

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Dorman 904-726 Exhaust Gas Temperature Sensor Compatible with Select Dodge / Freightliner /...
Dorman 904-726 Exhaust Gas Temperature Sensor Compatible with Select Dodge / Freightliner /…
Complete kit – comes with sensor, new bung, weld-on plate and zip tie
  • Mercedes Exhaust Temperature Sensor
  • 17mm short open-end wrench


  1. Raise the car at the front. Use a jack stand or ramps.
  2. Remove the soundproof shield to access the catalytic converter and exhaust pipes. mercedes b19/11 sensor sprinter
  3. Locate the exhaust temperature sensor. There are two to three exhaust temperature sensors on Mercedes diesel models and Dodge Sprinters.  Which sensor needs to be replaced depends on the fault code. mercedes dodge sprinter exhaust temperature sensor egrMercedes Exhaust Temperature Sensor
  4. Loosen the 17mm nut and pull it away from the sensor. replace mercedes  Exhaust Temperature Sensor Standard fits 10-17 Mercedes Sprinter 2500 3.0L-V6 A stubby 17mm wrench makes removing the sensor much easier.
  5. Remove the sensor from the exhaust, DPF, or catalytic converter. Note that the sensor tip is long. Do not bend the sensor part. mercedes dodge 320 350 bluetech p0544 code due to this sensor
  6. Remove any clips that hold the wire in place. In this case, a zip tie was used to hold the wire. A long screwdriver was used to cut the zip tie due to space constraints. Genuine Exhaust Temperature Sensor 0081534128 Dodge Freightliner Mercedes MB cut wire
  7. Unplug the electrical connector. remove mercedes exhaust temperature sensor
  8. Install a new exhaust temperature sensor in reverse order.

Solution 2 – Cleaning Mercedes Exhaust Temperature Sensor

It is possible to remove the sensor and clean it. You will need to use Sensor Safe Spray Cleaner to remove any built-upon sensor element. Blow air on the sensor element to clean it.

cleaning mercedes exhaust temp sensor

Cleaning the sensor may not always work. There is a high chance that the problem will return in a few months.

Check electrical connector

oil leak on mercedes sensor

If you clean the sensor or replace it, the code returns; ensure that the electrical connector is not saturated with oil or that the wire harness is not damaged.

We hope you find the Mercedes P0544 Code Exhaust Temperature Sensor Problem guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.

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