![]() Black smoke from the exhaust:Ī common sign of a defective coolant temp sensor is black smoke from the exhaust tailpipe. However, keep in mind that aside from faulty coolant temp sensor, there are other host causes of irregular or fluctuating temperature such as cylinder head leak, low coolant level, failing radiator fan, and bad pressure cap. While the coolant temperature might be cooler than the ambient air, the coolant temperature can send inaccurate readings to the car computer. Especially if the engine doesn’t warm as it supposes to, you have to contact your mechanic to diagnose and track down the problem in your cooling system. If you notice temperature fluctuations in your temperature gauge, or it stays lower or higher than expected when the engine is running, it could be an indicator of a failing or lousy coolant temp sensor. So, before a coolant temp sensor failure escalates to more significant auto repair for your transmission or engine, it will give the following signs Irregular temperature readings: Symptoms of a bad coolant temp sensorĮvery mechanical component in your vehicle emits symptoms to notify the driver when they fail, and the coolant temperature sensor is no exception. In this article, we’ll discuss at length how to tell if your coolant temp sensor is bad, the signs and symptoms of a defective coolant temp sensor, and how to fix the problem. Hence, you should always watch out for symptoms of a bad coolant temp sensor. The sensor sends a signal to the car computer to make changes for gas calculation and engine timing for peak performance.Īs the vehicle engine requires less gas when warmed and more gas when cold, the car computer will adjust the engine performance setting if it receives a signal that coolant temp is above the normal operating temperature to save the engine from catastrophic damages due to the engine overheating.īecause the coolant temperature sensor plays a critical role in the engine timing and calculation for optimal performance, a lousy coolant temp sensor can easily affect your engine’s performance. The coolant temp sensor functions perfectly by monitoring the coolant temp with the aid of an electrical circuit. If there is anything that you feel you could add to the article, please feel free to leave a comment below.The coolant temp sensor is one of the car engine management systems that monitor the temp of the radiator coolant. Wiring issues are the next most likely cause. Most of the time, P0118 is going to be caused by a bad temperature sensor. So, if you find yourself in a situation where you can’t remember the last time that the coolant has been changed, it may be worth a shot to just change it and see if you get lucky. A bad PCM can cause the the code to be triggered.Įngine coolant can cause the code to throw if it gets corroded enough. They typically aren’t going to be as prevalent though. ![]() There can be other causes of P0118 in your A4. Replacing the sensor straight away isn’t much of a gamble. ![]() If it remains the same, than the sensor is not working properly. If you have a volt meter, you could test the signal coming from it as the engine warms up. If you’re not getting 5 volts, re-inspect the wiring harness. It operates by receiving a 5 volt signal from the computer and a ground. Here’s a great guide on inspecting your wiring harness.Īfter thoroughly evaluating the wiring harness, it would be time to take a look at the sensor itself. After that, inspect the harness for wiring problems. Start by inspecting where the harness plugs into the Temp Sensor. It’s often the reason why the code was thrown. It’s a good idea to start diagnosing P0118 in your A4 at the wiring harness. Here’s a great video from CarNToys from YouTube on this exact problem. Most of the time, the cause of P0118 is going to be related to the wiring or the sensor in some way or another. It’s just as likely that the only sign that you’ll get from the A4 is the check engine light itself.Īs P0118 can greatly affect the drivability of your A4, we recommend fixing it as soon as possible. These symptoms include failure to start, rough idle, misfiring, decreased fuel economy, and the service engine soon light. P0118 is sometimes accompanied by noticeable symptoms. This code is thrown when the resistance coming from the coolant temp sensor does not change as the vehicle warms up. P0118: Engine Coolant Temp Sensor Circuit → High Input It is a general code, which means that it’s going to have the same meaning for the Audi A4 as it would any other vehicle.
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