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P0544 – Exhaust Gas Temperature Sensor Circuit - Bank 1 Sensor 1 (OBD2)

P0544 means "Exhaust Gas Temperature Sensor Circuit - Bank 1 Sensor 1". The control unit has detected a fault in the electrical circuit of the exhaust gas temperature (EGT) sensor: the signal or control current is missing or outside the expected window. The code does not say whether the value is too high or too low, so the wiring and the component itself both have to be checked.

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P0544 quick summary

Fault codeP0544
MeaningExhaust Gas Temperature Sensor Circuit - Bank 1 Sensor 1
SystemPowertrain (Engine & Transmission)
VehiclesGeneric OBD2
SeverityMedium
Can I drive?Yes, gently. On diesels DPF regeneration may stop, so have it fixed before the filter clogs.
Repair cost€40 – €300

How exhaust gas temperature sensors work

Exhaust gas temperature sensors measure the exhaust temperature at several points to protect the turbocharger and catalytic converter and to control DPF regeneration.

EGT sensors are thermistor or thermocouple-type sensors screwed into the exhaust – typically before the turbocharger, before the oxidation catalyst and before or after the DPF on diesels. They measure temperatures from below zero up to around 900–1,000 °C.

The control unit uses the readings to protect components from overheating (it reduces power when temperatures get too high) and to control DPF regeneration, which needs exhaust temperatures around 600 °C. Codes P0544–P0549 report circuit faults for sensor 1 of bank 1 and bank 2.

Sensors fail from heat cycling, their cables are damaged by heat and vibration, and connectors corrode. A faulty EGT sensor on a diesel often stops DPF regeneration, which can lead to DPF blockage codes.

Bank 1 is the side of the engine that contains cylinder 1. In-line engines (three, four, five or six cylinders in a row) have only bank 1.

On VAG vehicles (VW, Audi, Škoda, Seat, Cupra), VCDS and older VAG testers can show this code as the five-digit VAG code 16928 (P0544). Both numbers mean the same fault.

Symptoms of P0544

  • Check Engine light on
  • DPF regeneration not completing, DPF warning
  • Reduced power or limp mode
  • Implausible temperature readings in live data
  • Often no driving symptoms

Most common causes of P0544 (most likely first)

Mechanic's Pro Tip

EGT sensors are often seized in the exhaust. Apply penetrating oil and loosen them with the exhaust warm (not hot) – a snapped sensor thread turns a cheap job into an expensive one.

  1. 1.Damaged wire or loose, corroded connector at the exhaust gas temperature (EGT) sensor

    Most likely

    Green or white corrosion, pushed-back pins and chafed insulation near hot or moving parts are the most common findings.

  2. 2.Faulty exhaust gas temperature (EGT) sensor

    An internal break or short in the component itself.

  3. 3.Blown fuse or missing supply voltage

    If several codes appeared at the same time, check the shared fuse, relay or ground point first.

  4. 4.Wiring fault to the control unit

  5. 5.Exhaust leak near the sensor

Step-by-step diagnostic guide

  1. 1

    Read codes and compare temperatures

    Read all codes. On a cold engine all EGT sensors should show roughly the outside temperature.

  2. 2

    Check the circuit with a multimeter

    With the ignition off, unplug the exhaust gas temperature (EGT) sensor and the control unit connector (or back-probe), then check each wire between them for continuity and for shorts to ground and to battery voltage. Compare the component's resistance or supply voltage with the value in the repair manual.

    Multimeter: Wire continuity: below about 1 Ω. Wire to ground with both connectors unplugged: no continuity. Supply/reference with ignition on: usually 5 V for sensors, battery voltage for actuators.

  3. 3

    Check the cable and connector

    Inspect the sensor cable along its length for heat damage and the connector for corrosion.

  4. 4

    Measure the sensor

    Measure the resistance and compare with the specification.

    Multimeter: Many PTC/NTC EGT sensors read roughly 200–250 Ω at room temperature (PT200 type); check the type for your sensor.

  5. 5

    Check wiring

    Check the wiring to the control unit for opens and shorts.

  6. 6

    Replace and verify

    Replace the sensor using anti-seize on the thread, clear codes and check that DPF regeneration completes.

Frequently asked questions

Can I keep driving with P0544?

Yes, gently. On diesels DPF regeneration may stop, so have it fixed before the filter clogs.

How much does it cost to fix P0544?

Typical repair costs are 40 € – 300 €, depending on the cause and the vehicle. The most common fixes are: damaged wire or loose, corroded connector at the exhaust gas temperature (EGT) sensor; faulty exhaust gas temperature (EGT) sensor; blown fuse or missing supply voltage. Always confirm the cause with the tests above before buying parts.

Can a bad EGT sensor block the DPF?

Indirectly yes. Without a reliable temperature signal the control unit may not start or finish regenerations, so soot builds up.

How many EGT sensors does a car have?

Petrol engines may have one or none; modern diesels often have two to four.

What is the difference between P0544 and similar codes?

P0544 belongs to a group of codes for the same component that differ in the type or location of the fault: P0545 – Exhaust Gas Temperature Sensor Circuit Low - Bank 1 Sensor 1; P0546 – Exhaust Gas Temperature Sensor Circuit High - Bank 1 Sensor 1; P0547 – Exhaust Gas Temperature Sensor Circuit - Bank 2 Sensor 1; P0548 – Exhaust Gas Temperature Sensor Circuit Low - Bank 2 Sensor 1; P0549 – Exhaust Gas Temperature Sensor Circuit High - Bank 2 Sensor 1; P2031 – Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2. The tests on this page apply to the whole group; the type of fault tells you where to start.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.