![]() ![]() ![]() Poor MileageĪ faulty ECT sensor can send a false signal to the onboard computer, resulting in an incorrect air-fuel mixture. If you see a check engine light on your dashboard, it is time to check the trouble codes with an OBD2 scanner. If the computer detects any problem with the sensor’s circuit, it will illuminate the check engine light, indicating that the car needs an inspection. One of the first signs of all coolant temperature sensor symptoms you will probably notice is that the check engine light will show up on your dashboard. Here is a more detailed list of the signs of a bad or failing coolant temperature sensor to look for: 1. The most common symptoms of a bad coolant temperature sensor include poor mileage, cooling fans not coming on, engine performance issues, an overheating engine, and a check engine light on your dashboard. If there is anything that you would like to add, please leave a comment below.Conclusion Symptoms Of A Bad Coolant Temperature Sensor If you have reason to believe it’s gone bad, ignoring it will only end up costing a lot more money in the long run. Replacing a thermostat is a relatively affordable repair. This leak is not the cause but rather a symptom of your A4’s bad thermostat. Water can’t circulate through the cooling system when it goes bad, even if the thermostat is open.Īs pressure builds around a bad thermostat that is stuck shut, you’ll notice that there may be coolant leaking around the thermostat housing.
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