There are multiple reasons the check engine light came on in your Subaru. Your engine computer monitors all the systems in your vehicle anytime it is on. If it notices that something is out of the preset parameters, your engine light will come on.
The most common reasons why the check engine light comes on in your Subaru is due to; your emission system, ignition system, fuel system, an electrical issue, or one or more failed sensors.
This article will detail a variety of parts and issues related to the systems listed above to help you know what to do when your Subaru check engine light is on.
Reasons Why Your Subaru’s Check Engine Light Is On
1. A Problem In The Emission System
Various parts are involved in the Subaru emission system, which can cause the check engine light to come on. There are many rubber hoses used in your Subaru’s emission system. Over time these hoses will dry out and become brittle, causing leaks. When these leaks develop, the engine computer turns the check engine light on. If this is the case, you may not notice any change in your vehicle performance, making it challenging to identify without having a Subaru specialist look at your vehicle.
2. Ignition System
This problem is usually noticeable since it often will cause the vehicle to run differently. If there is an issue with something like your spark plugs, you will lose power, and you might even have a flashing engine light while driving. If the check engine light is flashing, you should not continue to drive the vehicle as an active misfire can cause severe damage to your Subaru’s engine resulting in very high repair costs.
3. Fuel System Issue
Failing parts in the fuel system can cause the engine light to turn on. If you have a failing fuel pump, clogged or failing fuel injectors, or a faulty fuel pressure regulator, you may notice drivability issues and need to repair them as soon as possible. A fuel system problem will cause the vehicle to run differently than expected. You might see a lack of power when attempting to accelerate. Also, the car may develop a misfire causing a flashing engine light. This can cause severe damage to multiple essential components on your Subaru and should be repaired quickly by a Subaru specialist.
4. Electrical System Fault
Problems with your electrical wiring can be some of the most difficult to diagnose. Often a standard mechanic will hook your Subaru up to an engine computer scanner to retrieve the fault code. The code might point to a part in perfect working order, but the wiring running to it is damaged, causing a misdiagnosis. Bring your car to a Subaru specialist to save time and money.
5. Sensor Failures
Your Subaru has multiple sensors for every system in the car. Modern Subarus even have a sensor that will let the engine computer know if your thermostat is not operating correctly. A failed sensor will cause the engine light to turn on. Depending on which sensor has failed, you may notice a change in the drivability of your Subaru.
Should You Continue Driving If The Engine Light Is On?
Due to the many reasons your engine computer could trigger the light to come on, you should stop driving and have your Subaru looked at by a trusted mechanic. It may be a severe issue that could cause major engine damage if not dealt with immediately.
If the check engine light is flashing, you should find a safe place to pull over and shut your Subaru off immediately. It is better to tow the vehicle to a trusted Subaru mechanic so it can be appropriately diagnosed. No matter why the check engine light is on, it will be in your best interest to have it looked at as soon as possible.
The majority of reasons your check engine light turns on are simple and inexpensive to fix as long as they are dealt with promptly. The engine computer will only turn the check engine light on when a problem is detected, so it is a great idea to diagnose the issue as soon as possible and not continue driving. Having a Subaru expert diagnose exactly what is causing your problem will save you money in the long run.