The Quick Answer above is the generic definition. What follows is the model-specific detail for the Volkswagen models that log P0545.
DTC/P0545·Volkswagen
P0545 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Volkswagen
P0545 on a Volkswagen means the engine computer is seeing a voltage from exhaust gas temperature sensor 1 on bank 1 that is lower than the circuit can normally produce, which usually points to a wire shorted to ground, a damaged connector or a failed sensor rather than a real temperature problem. On most diesels sensor 1 is the first temperature sensor in the exhaust, often in the exhaust manifold before the turbo, and the engine uses it to protect the turbo from overheating and to manage particulate filter regeneration. Some petrol engines also have one, ahead of the catalytic converter. The sensor numbering is set by each manufacturer, so check which physical sensor is number 1 on your engine.
Typical repair cost, all makes€60 - €470
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Volkswagen Golf 2.0 TDI
2009-2014On the common-rail 2.0 TDI, Volkswagen calls this part exhaust gas temperature sensor 1 (G235). It is threaded into the exhaust manifold at the turbo, a buried position that often needs a modified socket and careful routing of the lead on refitting. A fault on it can make the glow plug light flash along with the check engine light, and once the sensor is replaced the particulate filter can regenerate on its own again.
Volkswagen Touareg 3.0 TDI
2011-2016The 3.0 TDI V6 in the Touareg has four exhaust gas temperature sensors, and Volkswagen's own location information lists sensor 1 as G235. Its sheet colour-codes the four sensors and gives sensors 1 and 2 the same colour, black, so confirm you are working on sensor 1 and that its plug has not been swapped with sensor 2 before replacing anything.
What causes P0545 on a Volkswagen?
Beyond the generic causes listed on the main P0545 page, these are the patterns noted for Volkswagen models:
Volkswagen Golf 2.0 TDIFailed G235 sensor
Volkswagen Golf 2.0 TDIG235 lead damaged near the turbo
Volkswagen Touareg 3.0 TDIFailed exhaust gas temperature sensor 1 (G235)
Volkswagen Touareg 3.0 TDIConnector swapped with sensor 2 after earlier exhaust work
How to diagnose P0545 on a Volkswagen with OBD2
Follow these steps to pinpoint the root cause of P0545:
- Read all stored codes and the freeze frame with an OBD2 reader. Note any other codes for the same sensor (P0544 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.
- On most engines, unplugging the sensor with the key on should make the reading jump to the other end of the scale or set a circuit high fault instead. If it does, the wiring back to the engine computer is probably fine and the sensor is the likely fault.
- Measure the sensor's resistance against the manufacturer's specification, then check the signal wire for a short to ground and for continuity back to the engine computer.
- 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 P0545 cost to fix on a Volkswagen? (EUR)
Estimated repair costs for P0545 in EUR, compiled across makes. Expect Volkswagen parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0545
These codes are often seen alongside P0545 or point to related issues, on any make:
Looking for the full P0545 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0545 guideSkanyx · Volkswagen
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