Technical tips on engine gas temperature sensors

Cambiare provides guide on diagnosing EGTS damage

Technical tips on engine gas temperature sensors
Cambiare engine gas temperature sensor.

Engine management specialist Cambiare has provided some technical tips on the small but important engine gas temperature sensor (EGTS).

An EGTS measures the temperature of the exhaust gas which is monitored by the ECU to help prevent damage to components.

EGTS are primarily prone to damage during exhaust component replacements and should therefore be replaced simultaneously with a DPF and/or exhaust, rather than waiting for the dashboard warning light to illuminate.

Common causes of damage
  • Severe vibration that can break the connection of internal wires.
  • Excessively high temperatures (T>900°C) causing resistance deviation of the thermistor element.
  • Severely bent wires (where bending diameter<20mm) that can cause wire breakage.
  • Contamination from oil, antifreeze or poor fuel quality.

A faulty PTC (positive) EGTS tends to continually relay misinformation to the ECU without setting a diagnostic trouble code, making it seem like the DPF is regenerating within its permitted temperature range.

This delays the detection of thermal overload.

Often times, a DPF is wrongly assessed to be faulty, when it’s actually the failed EGTS which needs replacement.

Conversely, NTC (negative) EGTS, are designed with two wires bonded to a ceramic cell.

With time, this bond can break and the sensor goes into an open circuit, triggering the engine check light – an easy fault to diagnose.

Timely diagnosis and replacement of a defective EGTS prevents damage to the DPF and subsequent engine damage.

EGTS replacement

The Cambiare EGTS range consists of both PTC and NTC temperature coefficient technologies and now covers over 3.5 million vehicles on the UK roads.

Cambiare’s EGTS range highlights
  • VE390162 for Audi A4 2.0 (2008-2012).
  • VE390199 for Volkswagen Golf 2.0 (2012>).
  • VE390191 for Mercedes-Benz C-Class 2.2 (2009-2011).

Cambiare EGTS are fully catalogued on the Cambiare website.

To assist customers and installers to address anything from cataloguing issues and fitment difficulties, Cambiare’s technical team can be reached via the technical hotline at 0845 543 8280.

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