What is the Engine Oil Level Sensor (EOLS)? What are the Signs and Symptoms Of Failure?

What is an engine level sensor? What are the signs that an engine oil sensor malfunction is?

What is the Engine Oil Level Sensor (EOL)?

The engine’s lifeblood, oil, is what keeps it going strong for many thousands of miles. All types of engines require oil to circulate in their engines to properly lubricate the metal parts. The oil will cause the engine to heat up and break down, eventually rendering it unusable. Oil level sensors are used by drivers to tell them when engine oil levels are low and need to be topped up.

Different types of level sensors can be used to measure fluid levels in vehicles and other applications. The most common and easiest type of sensor is the mechanical one. There are many types of mechanical level sensors available: magnetic, cable, float, and mechanical. For oils with high viscosity, varnish, and liquids that are prone to sludge, float-type sensors should not be used. Pneumatic level sensors can be used in hazardous situations, when electrical power is unavailable or limited, or for applications that involve heavy sludge and varnishing. These sensors are especially well-suited for high viscosity fluids like grease.

Ultrasonic oil level sensors are used to monitor engine oil levels in luxury and modern vehicles. A running engine’s oil level is much lower than one that is stationary. The dipstick can only check the oil level when the engine is turned off. The oil level sensor on the other hand can monitor oil levels when the engine is dynamic or static. In a vertical position, the sensor is located on the bottom oil pan. The sensor is placed in the oil and continuously monitors the level of the oil, both stationary and moving.

It is very simple to use the sensor. The sensor transmits a signal (ECM/ECM/PCM), when the oil level falls below a predetermined level. A warning light in the instrument cluster is activated to alert the driver.

What are the symptoms of a failed engine oil level sensor?

Over time, oil level sensors can become worn out from high temperatures and harsh environments. In such cases, the engine control unit may send incorrect data. A fault code is created in the ECU’s memory when this happens. But, there are some signs that indicate that there may be an issue with the oil sensor. The most common symptoms include:

Incorrect Oil Level Readings

Low engine oil levels are detected by the oil level sensor and a warning light is displayed on the cluster. But, if the sensor is damaged, it could also lead to incorrect readings. It is best to check your dipstick manually if you get this warning. If the dipstick is not showing any signs of trouble after checking it 2-3 times, your sensor may be defective or the system is having other problems.

Intermittent Flashing the Oil Warning Light

Intermittent flashing of the oil warning lamp is another sign of an oil level sensor fault. The data are collected while your engine is turned off. Once you start your engine, the oil level sensor activates. The oil warning light will go on if there is no engine oil. A problem with the sensor could cause the warning light to flash while the vehicle’s in motion or after it has been stationary for some time.

This symptom could also be caused by other issues. If the oil pressure is low or the lines are blocked, the oil light might flash. Low oil pressure or clogging can cause engine failure.

Engine not starting

The oil level sensor was designed to be a warning device. If the sensor sends incorrect data, it can trigger false fault codes that could cause the ECU not to allow the engine start.

The ECU might switch to a limited power mode in some cases or refuse to allow the engine start if it is low.

Engine Malfunction light on

The oil warning lamp will be lit on the instrument panel if the oil sensor is functioning properly and the oil level is not low. The check engine light will also be activated if the sensor becomes damaged or defective.