Why is the Check Engine Light On?

Why is the Check Engine Light On?


Why is the Check Engine Light On?Your car is quite a feat of engineering. Not only can it take you from home to work or across the country with relative ease, it can detect when problems are present that could prevent it from doing so. Numerous sensors around the vehicle are constantly on the lookout for possible failures that could decrease efficiency, reliability or safety. Many of those sensors, should they sniff out a possible problem, will trigger the check engine light. Let's look at a few of the most common causes of check engine light illumination. Remember though, get to the auto shop for diagnostics as soon as the light comes on, as putting off services can cause the problem to get worse, as represented by this first issue.

Failed Catalytic Converter

The catalytic converter has a tough job, it turns hazardous exhaust fumes into less harmful emissions, and replacing it can be very expensive. Excessive gasoline fumes passing through the exhaust system could cause damage to it, an issue that could develop if one of the following two problems took place first, both of which would have triggered the light long before the catalytic converter was damaged.

Malfunctioning O2 Sensor

The oxygen sensor rests in the exhaust system, monitoring the amount of oxygen within the exhaust fumes in order to calculate the proper air and fuel mix for the engine. A malfunctioning sensor can result in more gasoline being burnt than necessary, which damages the catalytic converter.

Failed MAF Sensor

The mass air flow sensor is similar to the oxygen sensor except it is placed at the front of the vehicle and monitors incoming air, measures it and determines how much needs to be mixed with the gas. If the MAF sensor malfunctions it too could cause extra burning of gasoline, resulting in a loss of fuel efficiency and engine performance will suffer.

Cylinder Misfire

Misfiring is what occurs when the spark plugs are not firing at the precise moment they need to for maximum efficiency and power. This can be a result of spark plug corrosion, worn ignition coils, bad spark plug wires and other various issues. This will be a noticeable problem as it will cause your engine to run rough.

Loose or Cracked Gas Cap

The best thing you can hope for when the light comes on is that you forgot to tighten the gas cap the last time you filled up. A loose or broken gas cap may allow for fuel vapors to evaporate out of the filler hose, causing the light to come due to the EVAP system sening the leak.

It is important to have check engine light diagnostics conducted by a professional auto repair shop as soon as it comes on to prevent issues from growing worse. If you need check engine light diagnostics in Corona, Riverside or the surrounding communities visit Precision Import Auto Repair. Our bumper to bumper auto repair shop handles all makes and models. To schedule auto repair in Corona call us at (951) 338-9463 today.


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Written and Published By MORBiZ