How to Determine if the Exhaust Temperature Sensor is Faulty?
2 Answers
Place the evaporator temperature sensor in ice water; if the resistance value remains unchanged or increases, it indicates the sensor is damaged. Then pour hot water over it and use a multimeter to measure the resistance between the two terminals. If the measured value does not match the expected value, it can be concluded that the sensor is damaged.
It's relatively easy to tell if the exhaust gas temperature sensor is faulty. First, the check engine light usually comes on, displaying a trouble code like P0544. The car's acceleration becomes noticeably weaker, feeling sluggish even when going uphill, and fuel consumption inexplicably increases. The exhaust pipe may produce unusual noises, such as crackling sounds. During daily driving, the engine response becomes sluggish. The most direct way to check is by using an OBD diagnostic tool—connect it and read the trouble codes for confirmation. Additionally, the sensor's wiring is prone to aging and loosening, so check for corrosion or loose connections at the joints. These issues might occur due to prolonged exposure to high temperatures causing aging or damage after the vehicle has driven through water. I recommend addressing this promptly, as otherwise, the turbocharger could overheat and get damaged. From a safety perspective, driving a faulty car poses significant risks—if the temperature goes out of control, it could harm the engine.
