The Delphi TS10278 is a 2-pin engine coolant temperature sensor, commonly referred to as an ECT sensor, designed for selected Volkswagen and Audi vehicles. Available at Dub Source JA, Kingston’s dedicated VW and Audi parts specialist in Jamaica. WHAT IT DOES This sensor is threaded directly into the engine block or cylinder head where it makes contact with the coolant circulating through the engine. It measures the temperature of that coolant continuously and sends a live electrical signal to the ECU. The ECU uses this reading to make real-time decisions across three critical areas: how much fuel to inject at any given moment, when to fire the ignition relative to piston position, and when to switch the radiator cooling fans on and off to prevent the engine from overheating. WHY IT MATTERS The engine coolant temperature sensor is most critical during the warm-up phase, which is when the engine transitions from cold to its normal operating temperature. During this period the ECU relies heavily on ECT data to run a richer fuel mixture, advance or retard ignition timing correctly, and manage idle speed. When the sensor fails or sends an inaccurate reading, the ECU loses that reference point entirely. Common symptoms include hard cold starts, rough or unstable idling, poor fuel economy, black smoke from the exhaust indicating a rich running condition, overheating due to cooling fans not activating at the right time, and in some cases a check engine warning. On turbocharged Volkswagen and Audi engines these symptoms are more pronounced because the ECU’s fuel and timing decisions are more tightly managed than on older naturally aspirated units. COMPATIBILITY The Delphi TS10278 fits selected Volkswagen and Audi models. Sensor fitment is specific to engine code and coolant circuit design, so confirming the correct part for your vehicle before ordering is important. Use our VIN Part Matching service to verify fitment, or browse our full Electrical parts range for related sensors and components. AVAILABILITY In stock at 70A Mannings Hill Road, Kingston. We deliver island-wide across Jamaica. Call 876-740-9332 or order at dubsourceja.com. Delphi Coolant Temperature Sensor TS10278 available at your Volkswagen and Audi parts specialist in Kingston, Jamaica.