Top 5 Reasons the Check Engine Light is On

Top 5 Reasons the Check Engine Light is OnFor many people the check engine light is a sure sign of expensive repairs ahead. This simply isn't the case, as long as you act quickly when the light comes on. Most check engine light issues start out relatively small and will grow into much larger, and costly problems over time. The following are some of the most common reasons the light comes on, starting with a worst case scenario.

Failed Catalytic Converter

If you find out that the catalytic converter is in need of repair or replacement when you go in for check engine light diagnostics it likely means that light has been on for some time. This part converts hazardous exhaust fumes into less harmful emissions, but can fail if other, easier to fix parts, fail first, which likely would have triggered the check engine light long ago.

Bad O2 Sensor

A failed oxygen sensor can lead to a faulty catalytic convert. This sensor is located in the exhaust system and monitors how much oxygen is in the vehicle's emissions. This measurement helps determine how much fuel to burn. If the sensor fails you'll likely experience a drop in fuel efficiency.

Failed MAF Sensor

On the other end of the car is the mass air flow sensor. This sensor measures incoming air and calculates how much needs to be mixed with the gasoline to ensure a proper running engine. A failed sensor can also lead to the engine running rich, which will lower fuel efficiency and damage the catalytic converter.

Dirty Spark Plugs

The spark plugs in your internal combustion engine need to be replaced as recommended by factory specifications. Dirty or corroded spark plugs will likely lead to misfiring, which causes the engine to run poorly, resulting in poor idling abilities and will allow for the possibility of engine stalling.

Loose/Broken Gas Cap

The best case scenario is finding out that you simply forgot to tighten the gas cap the last time you filled up. Or, your gas cap is broken or cracked. This will cause fuel vapors to evaporate from the tank, causing the EVAP system to trigger the check engine light.

When your check engine light comes on don't hesitate to get to a shop to find out what's up! If you need check engine light diagnostics in Austin the team at Precision Tune Auto Care will get you taken care of. Our full service auto repair shop is staffed by ASE certified techs who work on all makes and models. Give us a call at (512) 580-4826 to schedule an appointment for expert auto repair in Austin! We look forward to helping you get back on the road.

Precision Tune Auto Care Blog

Written and Published By MORBiZ

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