What are the symptoms of a defective coolant temperature sensor - what are the costs of replacing it, etc.! The coolant temperature sensor is also called coolant sensor, coolant temperature sender, double temperature sender or engine temperature sensor. It is responsible for recording the temperature of the cooling water and thus also of the engine. The control unit uses this information as a basis for, among other things, determining how much fuel is to be injected. If this sensor is defective, it is often the age or wear and tear due to the permanent thermal load. But what signs or symptoms indicate a defect in the coolant temperature sensor? It should be noted here that the following possible symptoms do not all have to occur at once. Even one of the indications is sufficient as a basis that the sensor has a defect. Other symptoms can also occur.
Possible symptoms of a defect!
- The instrument cluster displays the coolant temperature incorrectly or not at all.
- The engine control unit injects too much fuel due to the incorrect sensor values, fuel consumption increases.
- There are errors in the function of the automatic start-stop system.
- The error memory issues messages such as "Coolant temperature sensor signal implausible" etc.
- The car has difficulty starting or does not start at all.
- Because the engine mixture is no longer correct, the engine may stall while driving.
- The exhaust emissions are too high, also a problem during the main inspection.
Defective coolant temperature sensor - possible confusion?
Yes, the symptoms just listed can also have other reasons. If the coolant temp gauge doesn't go up, that can too Thermostat be defect. The workshop must therefore carry out an exact diagnosis. the Error memory entry should give a clear indication of whether there is a defect in connection with the coolant temperature sensor.
Continue driving with a defective coolant temperature sensor?
It should not be driven on, because continuing to drive with a defective coolant temperature sensor can lead to overheating from the engine and result in expensive damage. Therefore, a workshop should be visited at the first sign of such a defect. In addition, fuel consumption increases, which unnecessarily burdens the wallet and the environment.
Repair or replacement of the coolant temperature sensor!
If the workshop diagnosis shows that the coolant temperature sensor is defective, the defective sensor should be replaced by a new sensor to be replaced. The sensor should not to be repaired. Although there are used spare parts, it is not possible to determine exactly whether they are really still in good condition and will function permanently. In addition, the material costs are manageable. How much effort is required to change the coolant temperature sensor depends on the design of the vehicle and the position of the sensor. But first the engine cover has to be removed. Depending on where the sensor is located, other components, such as this intake, to be removed. Once the sensor has been reached, it can be replaced with a new part in just a few simple steps.
Cost: Changing the coolant temperature sensor!
The invoice consists of the working time for the repair and the cost of the component. A new coolant temperature sensor costs between 20 and 80 euros. There are various manufacturers who have such a sensor in their range, such as Bosch, Febi, Hella or Valeo. Depending on the vehicle model, the change takes 30 to 60 minutes. If an hourly rate of 100 euros is taken as a basis, the costs for the working time amount to 50 to 100 euros. That would settle the bill between 70 and 200 euros lie.
With a defective coolant temperature sensor for the main inspection?
The exhaust gas values can increase due to the defect in the coolant temperature sensor, then the vehicle will pass the main inspection not. This can also happen if the coolant sensor is leaking.
What is the task of the coolant temperature sensor in the engine?
Modern engines are designed to optimal efficiency and thus to achieve the lowest possible exhaust emissions. This is there to make that possible Engine control unit. The engine control unit receives measured values from various sensors and makes settings on the engine accordingly. The temperature of the engine is measured with the coolant temperature sensor continuously monitored. The temperature results from the temperature of the cooling water flowing in the cooling water circuit. These values are the basis for the engine control unit to adjust the injection quantity and the ignition angle in addition to other key data. Every vehicle therefore has a coolant temperature sensor. Some models are even equipped with two such sensors. The second sensor then checks the data from the first sensor.
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