![]() When the system fails to gather this information it can lose its effectiveness at starting the engine. The ECU needs to know the coolant temperature and the outside air temperatures in order to figure out the correct cold-start air/fuel combination. I havent driven my car much but yesterday while on the way to the store, the check engine light went on. The last code was P0128 so I had the thermostat replaced and put in all new coolant. If you hit the gas pedal but struggle to get your car going, it could mean a problem with the coolant sensor. coolant Hi again Im still dealing with the check engine light issue. Note- If there is an excess of black smoke coming from the exhaust pipe, it is advised to contact a mechanic immediately. Inaccurate readings sent from the coolant temperature sensor can cause the fuel management system to mix fuel improperly. When the ratio of air-fuel is not in proportion, particularly if the mixture becomes too fuel-rich, It will get exceedingly difficult to process the fuel completely inside the combustion chamber, leading to the burning of the leftovers in exhaust pipes. If you notice black smoke coming out of the exhaust pipe it could be due to a miscalculation of the air-fuel mix in the engine. This is another clear-cut sign of a bad sensor. ![]() A faulty sensor can send a permanent cold signal to the engine by not pumping enough fuel when needed, while it can also feed a permanent heating signal by not turning the radiator fans when the temperature climbs. If the coolant temperature sensor is not able to detect hot and cold conditions, it can cause the engine to get overheated. If your car uses only one all-purpose temperature sensor that fails to produce an accurate reading of the engine’s temperature, a bad engine coolant temperature sensor might be the cause of the cooling fans not starting. While most cars have two separate sensors for the electric fans, dashboard, and engine management system, some vehicles only have one coolant temperature sensor to manage the cooling fans. Electrical Cooling Fans Not StartingĪnother suggestive sign of a broken coolant temperature is the cooling fans for the engine not coming on. If you feel uncomfortable handling this, consider having a certified mechanic, such as one from YourMechanic, come over to handle the repair for you and check if the Check Engine Light is reading any other codes.This cycle will cause the engine to deliver poor fuel economy and more importantly, will lose its efficiency in the long run. Please note that a lot of vehicles have special coolant fill procedures for when you refill your coolant. If you feel like this is a job you can handle be sure you clear the codes and reset the module after performing the repair. Recommended Services Or For Any Other Auto Repairs Get a Quote Reggie Whiddon Automotive Mechanic 35 years of experience Sounds like you have a code P0128. After replacing the thermostat, record your engines warm up cycle and compare it to before the repair to confirm your issue was resolved. A Check Engine light system check revealed a possible thermostat problem. If it is, then I’d recommend replacing the thermostat. You would first test that the thermostat is indeed at fault by monitoring a warm up cycle of the engine. Either of these options lead to the engine not reaching the desired temperature level. This DTC can be triggered by a missing or stuck open thermostat, a faulty coolant temp sensor, or damaged wiring to the coolant temp sensor circuit. Now the code gets recorded because sometimes the thermostat has become stuck open or it leaks when closed. The computer does this because it is trying to go into closed loop operation as quickly as possible leading to better fuel economy. The computer monitors the warm up cycle of your engine - it looks for your coolant temperature to rise to a certain level within a given time frame.
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