Key temperature sensors on modern engines
- Coolant temperature sensor (ECT) — warm-up enrichment, fan control, idle strategy
- Intake air temperature (IAT) — air density and ignition/fuelling corrections
- Exhaust gas temperature (EGT) — protection on turbos and aftertreatment systems
- Oil temperature — on many performance and newer platforms
- AdBlue / SCR tank heaters — temperature control for urea systems on Euro 6 diesels
What happens when a sensor fails?
The ECU may substitute a default value, run rich or lean, limit boost, or trigger limp mode. Drivers often notice poor cold running, incorrect gauge behaviour, or higher fuel use.
Temperature sensors and remapping
Maps rely on accurate temperature inputs for safe boost and fuelling. A stuck-cold coolant sensor, for example, can keep the engine in rich warm-up mode. We review live data before writing a Stage 1 or economy calibration.
Linked systems
Temperature data also feeds DPF regenerations, EGR strategies and catalyst monitoring. See O2 sensors, catalytic converters and AdBlue systems.
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Based in Greater Manchester — get in touch with your vehicle details.