![]() In many cases, when the ECT sensor fails, the "check coolant" light will illuminate-if applicable to the specific vehicle-in addition to the MIL. Start the car engine and place your hand on the radiator hose. On average, a coolant change should occur every 30,000 miles. In some cases, you may not notice any performance issues, as would be the case if you forget to tighten the gas cap. If it is contaminated, the thermostat could stick. When your Saab check engine light comes on, you may notice: Engine running rough. Click the link to the right of each one to learn more. Pay attention to the condition of the coolant. Click the link to the right of each one to learn more. Low coolant affects the internal engine temperature which is protected by antifreezetriggering the CEL to come on to alert you of engine overheating. If the "check engine" light does not reset, further diagnosis will be required to determine what needs to be replaced. The following are warning lights and indicators found in vehicles built by Mercedes Benz. Yes, low coolant levels in your car radiator can trigger the check engine light to come on. ![]() It will take a few hours driving at normal vehicle operating temperature for the ECT to communicate to the PCM and reset the MIL. Top off the radiator with the proper antifreeze, and see what happens. There are many things that can cause the Check Engine light to come on. The low coolant sensor will not turn the Check Engine light on - even if the coolant really is low. If you have checked it and it is not low, then the sensor is most likely defective. Maybe, but there's no guarantee damage hasn't been done to either the ECT sensor or the thermostat. The Check coolant light means that the coolant level in your radiator is low. As a result, the ECT sensor can be compromised. Low coolant will not provide enough temperature protection to sufficiently control the internal heat. Low coolant can lead to engine temperatures exceeding 230☏, significantly above the optimal range of 195☏ to 220☏. In a study, 5 of check engine lights were linked to cooling system issues, including low coolant. Your owner’s manual will have more information about the correct type of coolant. Low coolant level can cause the check engine light to illuminate. While IAT formula coolant is the most popular option for most vehicles, be sure to use the same coolant that’s already in your vehicle. Initialized in OBD (on-board diagnostic) and OBD II (vehicles manufactured from 1996 and beyond), the sensor is immersed in the coolant system in order to monitor the coolant protection level. If your coolant looks great and is just a little low, top it off with premium engine coolant. The coolant temperature sensor regulates the internal temperature of the combustion engine.
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