![]() ![]() How to Deal with a Bad Coolant Temperature Sensor? A bad connection to the ECU could prevent the car's computer from receiving data from the sensor, resulting in temperature measurement problems. The sensor also fails as a result of bad or loose electrical connections. A coolant temperature sensor could either fail as a result of corrosion building up on the sensor, which would render it incapable of accurately detecting temperature. There are two main causes of a bad coolant temperature sensor. What Causes a Bad Coolant Temperature Sensor? A problem with the coolant temperature sensor could cause the engine to receive too much fuel, which will greatly impact the engine's fuel economy. 5) Poor Fuel EconomyĪs we mentioned before, the readings from the coolant temperature sensor are used to determine the amount of fuel the engine will consume. This results in incomplete combustion in the cylinders, which causes black smoke to come out of the exhaust. A problem with the sensor can result in excess fuel being sent to the engine. ![]() ![]() ![]() The coolant temperature sensor controls the amount of fuel being delivered to the engine. As a result, it triggers the check engine light. 3) Check Engine Light is OnĪ bad coolant temperature sensor is a serious problem that poses a risk to the engine. If the engine temperature seems to be colder or hotter than it normally would be, then there may be a problem with your temperature sensor. If the coolant temperature sensor is bad, the engine temperature gauge will not display an accurate reading. This causes a hard start condition or a no start condition in serious cases. When a faulty coolant temperature sensor causes a bad fuel-air ratio, the car won't be able to crank effectively. Here are some signs that your coolant temperature sensor has gone bad: 1) Hard Start Noticing one or more of these symptoms indicates that your car's coolant temperature sensor is failing. This will result in certain symptoms that can easily be observed. What Are the Symptoms of a Bad Coolant Temperature Sensor?Ī bad coolant temperature sensor will negatively impact the car's performance. When the sensor goes bad, the car might shut off the engine or reduce the amount of fuel delivered to it, making it harder for the car to start. The ECU then manages the heat level of the engine by adjusting the fan speed and fuel consumption rate. The coolant temperature sensor detects the temperature of the engine by measuring the heat in the coolant. The hot coolant is then pumped through the radiator where cool air removes the heat from the coolant. To understand how a bad coolant temperature sensor causes hard starting, we will first need to understand how a coolant temperature sensor operates.Ĭoolant runs through pipes in the engine and removes heat from the engine. Hope this helps.How Does a Bad Coolant Temperature Sensor Cause Hard Starting? In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle." The intent of the P0128 code is to indicate a faulty thermostat. "This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. Soon enough my "check engine" and "check vsc" light came on along with the main red triangle light. I first discovered the problem when I noticed the gauge would read very low, pretty much close to the bottom even after a hour or so of driving. Just had my coolant temp sensor replaced about 2 months ago. ![]()
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