The locations of the X-Trail sensors are as follows: 1. Oxygen Sensor: The oxygen sensor is usually installed on the exhaust pipe and is used to monitor the post-combustion gases to determine whether the engine combustion is sufficient and whether the mixture is too lean or too rich. 2. Wheel Speed Sensor: The wheel speed sensor is generally installed on the front wheel brake disc. Its main function is to collect the vehicle's speed to determine if there are any signs of skidding. Therefore, there is a dedicated sensor to collect the wheel speed, usually installed on the hub of each wheel. If the sensor is damaged, the ABS will fail. 3. Coolant Temperature Sensor: The coolant temperature sensor is usually installed next to the thermostat. It converts the coolant temperature into an electrical signal. At low temperatures, it increases the fuel injection amount or advances the ignition timing, while at high temperatures, it prevents detonation and delays the ignition timing. 4. Intake Pressure Sensor: Generally installed near the throttle valve, the intake pressure sensor, as the name suggests, senses a series of resistance and pressure changes with different engine speeds and loads, converting them into voltage signals for the ECU to adjust the fuel injection amount and ignition timing. If it malfunctions, it can cause difficulties in ignition, unstable idle, and lack of acceleration power.
