What is the difference between P0544, P0545 and P0546?

All three concern exhaust gas temperature sensor 1 on bank 1. P0545 means the voltage is too low, usually a short to ground or a shorted sensor, and P0546 means it is too high, usually an open circuit or an unplugged sensor. P0544 is the general circuit code, set when the signal is faulty or erratic without fitting either of those, often because of an intermittent connection.

Can I drive with P0544?

Usually yes in the short term, and many cars feel normal at first. Some engines limit power to protect the turbo while they cannot trust the temperature signal, and many stop regenerating the particulate filter. Get it fixed within a week or two so a sensor or wiring repair does not turn into a blocked DPF.

Can a bad exhaust temperature sensor stop DPF regeneration?

Yes. The engine computer uses the exhaust temperature sensors to heat the particulate filter to the right temperature without damaging the turbo or the filter. Without a trustworthy reading, many engines suspend regeneration, so soot keeps building up until the sensor or its wiring is repaired.

How much does it cost to fix P0544?

A new exhaust gas temperature sensor typically costs 65 to 220 euros fitted. A connector repair runs 70 to 240 euros and a damaged wiring section 140 to 470 euros. If the filter loaded up while the sensor was faulty, a forced regeneration adds 60 to 150 euros.

P0544: Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)

Quick Answer

Safe to drive (short-term)

P0544 means the engine computer has found a fault in the circuit of exhaust gas temperature sensor 1 on bank 1: the signal is missing, erratic or does not make sense, without being clearly stuck low or high. It is an electrical fault, most often a damaged sensor, a heat-damaged wire or a corroded connector, rather than a real temperature problem. On most diesels sensor 1 is the first temperature sensor in the exhaust, often before the turbo, and the engine uses it to protect the turbo and to manage particulate filter regeneration. The sensor numbering is set by each manufacturer, so check which physical sensor is number 1 on your engine.

Severity: Moderate · Emissions
Estimated repair cost: From €60 to €470+, varies by vehicle

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What does P0544 mean?

P0544 is a emissions-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0544 and illuminates the check engine light.

Where it is on the car

Exhaust temperature sensors
Oxidation catalyst (DOC)
Diesel particulate filter (DPF)
DPF pressure sensor and its two tubes
AdBlue line and injector
SCR catalyst

Sensor 1 is the one nearest the engine; higher numbers sit further down the exhaust. Your car may have up to four.

What are the symptoms of P0544?

If your vehicle has triggered P0544, you may notice one or more of these symptoms:

Check engine light on
Often no change in how the car drives at first
Glow plug light flashing on some diesels, VW group TDIs among them
Reduced power or limp mode on some models
Particulate filter regeneration not taking place, so a DPF warning can follow later
P0545 or P0546 (other faults on the same sensor) stored alongside on some cars

What causes P0544?

Here are the most common causes of P0544:

Failed exhaust gas temperature sensor 1
: high
Sensor lead heat-damaged, chafed or broken near the exhaust or turbo
: high
Corroded, wet or loose connector at the sensor
: medium
Intermittent break inside the sensor lead from repeated heating and cooling
: medium
Wrong or incompatible replacement sensor fitted
: low
Engine computer input fault (rare)
: low

Is it safe to drive with P0544?

Generally yes, for short-term driving. Driveable in the short term, and the car often feels normal at first. Do not leave it for weeks: without a trustworthy temperature signal from the first exhaust sensor, the engine computer may limit power to protect the turbo and may suspend particulate filter regeneration. A filter that goes too long without regenerating can block, which turns a sensor or wiring repair into a DPF clean or replacement.

How do you diagnose P0544?

Follow these steps to pinpoint the root cause of P0544:

Read all stored codes and the freeze frame with an OBD2 reader. Note any other codes for the same sensor (P0545 or P0546) and any particulate filter codes such as P2463 or P244B. A generic OBD2 reader shows the codes, the freeze frame and standard live data, and a few engines report exhaust gas temperature on a standard PID. On most cars the individual sensor readings, the soot load and the regeneration status need manufacturer-level software, and only that software or a workshop can run a forced regeneration.
Find out which physical sensor is number 1 on your engine. On many diesels it sits in the exhaust manifold just before the turbo, but engines with several exhaust temperature sensors number them differently, so check the workshop information before buying a part.
Unplug the sensor and inspect the connector for water, corrosion and pushed-back pins. Follow the lead along the exhaust and turbo and look for melted or chafed insulation where it could touch metal.
Measure the sensor's resistance against the manufacturer's specification, and gently flex the lead while measuring: a reading that jumps points to a break inside the lead.
Check the signal wire for continuity back to the engine computer and for shorts to ground or to voltage.
Replace the sensor if it is out of specification, using the correct part for the engine code and position. A sensor that has been in the exhaust for years is often seized, so penetrating oil and heat may be needed, and a buried sensor 1 can mean removing heat shields.
Clear the code and road-test. If the filter loaded up while the sensor was faulty and the car does not regenerate on its own, a forced regeneration with manufacturer-level software may be needed.

How much does P0544 cost to fix?

Repair costs for P0544 vary depending on the root cause and your vehicle. Here are typical estimates:

Repair	Parts Cost	Labor Cost	Total Estimate	DIY Difficulty
Replace exhaust gas temperature sensor	€25–€100	€40–€120	€65–€220	Moderate
Clean and repair sensor connector	€10–€60	€60–€180	€70–€240	Moderate
Repair sensor wiring harness section	€20–€120	€120–€350	€140–€470	Professional
Forced DPF regeneration if soot built up meanwhile	€0–€0	€60–€150	€60–€150	Professional

Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.

P0544 on specific vehicles

P0544 behaves differently depending on your vehicle. Select your car below for model-specific causes and known issues:

P0544 on Volkswagen

Volkswagen Golf 2.0 TDI

See Volkswagen-specific causes & cost

These codes are often seen alongside P0544 or indicate related issues:

Common questions about P0544

What does P0544 mean?: P0544 means the engine computer has found a fault in the circuit of exhaust gas temperature sensor 1 on bank 1. The signal is missing, erratic or implausible. That is an electrical fault, usually a damaged sensor, wire or connector, not a sign that the exhaust is actually too hot or too cold. On most diesels this is the first temperature sensor in the exhaust, often before the turbo.
What is the difference between P0544, P0545 and P0546?: All three concern exhaust gas temperature sensor 1 on bank 1. P0545 means the voltage is too low, usually a short to ground or a shorted sensor, and P0546 means it is too high, usually an open circuit or an unplugged sensor. P0544 is the general circuit code, set when the signal is faulty or erratic without fitting either of those, often because of an intermittent connection.
Can I drive with P0544?: Usually yes in the short term, and many cars feel normal at first. Some engines limit power to protect the turbo while they cannot trust the temperature signal, and many stop regenerating the particulate filter. Get it fixed within a week or two so a sensor or wiring repair does not turn into a blocked DPF.
Can a bad exhaust temperature sensor stop DPF regeneration?: Yes. The engine computer uses the exhaust temperature sensors to heat the particulate filter to the right temperature without damaging the turbo or the filter. Without a trustworthy reading, many engines suspend regeneration, so soot keeps building up until the sensor or its wiring is repaired.
How much does it cost to fix P0544?: A new exhaust gas temperature sensor typically costs 65 to 220 euros fitted. A connector repair runs 70 to 240 euros and a damaged wiring section 140 to 470 euros. If the filter loaded up while the sensor was faulty, a forced regeneration adds 60 to 150 euros.

Read our detailed guides

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