When the vehicle’s computer brain thinks something is wrong, the orange engine-shaped icon on the dashboard’s instrument cluster is designed to turn on.
If you see it, don’t freak out; it doesn’t imply you’ll have to hand over your next salary to the next mechanic. Some of the issues that cause your check engine light to illuminate are simple and quick to resolve. Also, don’t ignore it; get it looked out sooner than later.
Your car’s Check Engine Light is never good news. At the very least, your gas cap could be loose, but it could also be a faulty sensor, connector, wiring, or, worse still, a significant engine problem. Just ignoring it if the automobile runs and drives normally may appear rational for a while, but issues will inevitably arise.
- Failed oxygen sensors
The unburned oxygen amount in the vehicle’s exhaust system is measured by your oxygen sensor.
Oxygen sensors are also susceptible to failure after 80,000 miles in +800 degree exhaust temperatures. It’s crucial to remember that there are a variety of engine codes that indicate that something is wrong with the oxygen sensor, but this does not mean that your oxygen sensor is defective.
It’s important to distinguish between figuring out that a sensor is actually faulty and determining that something else is going on.
- Gas cap loose/damaged/missing
Your gas cap is actually a part of a larger, sealed system that recirculates and prevents gasoline vapours from leaking into the atmosphere. As a result, this system of valves and lines and is continuously monitored, and the gas cap is one of the important sealing components.
You’ll notice this light soon if you mistakenly leave the gas cap off. The “little” and “big” leaks in your gas tank recirculation system are frequently grouped together.
It’s crucial to note that your problem isn’t always the gas cap; the leak could be caused by one of your plastic recirculation lines, connectors, or fittings, although the gas cap is usually to blame.
- Bad catalytic converter
By converting toxic CO into CO₂, your catalytic converter helps to protect the environment. If something goes wrong with the converter, a series of trouble codes depending on “Catalyst efficiency” will emerge.
It’s crucial to keep in mind that a catalytic converter may seldom fail on its own. In most cases, something causes it to malfunction or fail.
As a result, just replacing the oxygen sensors or the converter around it will seldom solve the problem, and will almost always fail another converter. A burst head gasket, for example, can drive burnt coolant vapour into the exhaust, resulting in a catalyst engine code.
- Mass airflow sensor
The mass airflow sensor (MAF) determines how much fuel is required to run properly your engine by measuring the air amount entering the engine. A light can be triggered if there are any leaks in the intake tract before or after your mass airflow sensor.
Oil, grime, and water vapour are all sensitive to mass airflow sensors, and any contamination present on them can cause a light to turn on. Cleaning the sensor using intake or mass airflow sensor cleaner will sometimes resolve the problem.
In certain cases, the sensor merely needs to be changed. Make a thorough inspection of the intake ducting for rips, leaks, or tears/damage.
- Misfires
Your spark plugs will ignite the air/fuel combination in your vehicle’s combustion chamber; however, if the timing of the spark, the fuel mixture, and the air/fuel compression isn’t exactly right, you’ll experience a misfire.
A misfire can be caused by a variety of factors, including a single-cylinder misfire or a “many cylinder misfires,” which means the misfire is random.
- Vacuum leak
Every car contains a vacuum system that can be used for a variety of tasks. The brake booster is usually vacuum-operated, and your vacuum system also helps to reduce hazardous emissions by directing gases away from the engine as the fuel evaporates.
A vacuum leak could be at blame if your cars idle starts to surge or even settles at any unusually high rpm.
When vacuum hoses get old, they might dry out and crack, particularly if they’re exposed to excessive heat or cold. Vacuum leaks are mostly caused by this. Cracked fittings and loose connections are also prevalent problems.
Although vacuum lines are inexpensive, locating the cause of the leak is time-consuming – and costly if you don’t do the work yourself.
- Failure of exhaust gas recirculation (EGR) valve
The exhaust gas recirculation system helps the car’s engine function more effectively by reducing the volume of nitrogen oxide it emits. The hot exhaust gases are redirected back into your combustion chambers, warming the fuel and making it simpler to burn. It also cuts down on pollution.
The EGR valve might become blocked or completely fail. You can remove this valve, clean and also reinstall it in a reasonably short amount of time if you’re even remotely mechanically inclined. If your valve needs to be changed, a brand-new, OEM-quality device would set you back at least $125.
- Dead battery
Your car won’t start and light up, or even charge your phone unless you have a battery. Batteries today last far longer than they did in the past, and they don’t require any maintenance.
The cost of a new one varies depending on the type of vehicle you drive, but expect to pay a minimum of $100 for a good one.
What to do in such a situation?
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Until you get your car diagnosed by an expert, you won’t know what your check engine light really indicates. The alert could suggest something minor and innocuous – or something more significant that could result in further car damage.
If your engine light comes on, adjusting the gas cap can be a good idea. Remember that a loose gas cap might cause a check engine light to illuminate, therefore firmly tightening this cap could cure the problem.
There’s no need of getting your automobile serviced if the light goes out. If the indicator remains illuminated, your car may be experiencing a more significant issue.
