How to Determine if the Exhaust Temperature Sensor is Faulty?
3 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.
I think diagnosing a faulty exhaust temperature sensor is quite straightforward. First, check if the yellow engine warning light is illuminated on the dashboard. When driving, you might notice the car feels off, with significantly reduced power, especially lacking punch during acceleration. Abnormal fuel consumption increase is also common. Listen for unusual noises like rattling or popping sounds from the exhaust pipe. Then, unplug the sensor connector to see if the warning light turns off. At home, you can use a multimeter to measure the sensor's resistance, which should fluctuate within a specific normal range. Infinite resistance indicates an open circuit. Also, ensure the wiring connections are secure to prevent poor contact. This sensor is prone to failure due to high-temperature corrosion in the exhaust system. Related discussions mention that high exhaust temperatures can also affect emission compliance. If symptoms match, prompt repair is essential to avoid damaging the catalytic converter.
