Engine Coolant Temperature Sensor 1/2 Correlation

Descripción

This code indicates a mismatch between two different engine coolant temperature sensors (Sensor 1 and Sensor 2). Your car might have multiple sensors to get a more accurate reading of the coolant temperature.

Pasos de reparación

1. 1 Check engine coolant level and top off if low, as insufficient coolant can cause inaccurate temperature readings between the two sensors.
2. 2 Inspect the wiring and connectors for both coolant temperature sensors (Sensor 1 and Sensor 2) for damage, corrosion, loose pins, or fraying.
3. 3 Check the temperature readings from both sensors using an OBD-II scan tool — with a cold engine, both should read close to ambient temperature; a significant difference indicates a faulty sensor.
4. 4 Replace the coolant temperature sensor that is providing an incorrect or out-of-range reading compared to the other sensor.
5. 5 Inspect and test the thermostat for proper operation, as a stuck-open or stuck-closed thermostat can cause inconsistent temperature readings between the two sensors.
6. 6 Replace the thermostat if it is not opening or closing at the correct temperature.
7. 7 Repair or replace any damaged wiring or connectors in the coolant temperature sensor circuits.
8. 8 Have the engine control module (ECM) inspected and reprogrammed or replaced by a professional if all sensors, wiring, and thermostat test normal.

Diagnóstico y costo