There are a plethora of malfunctions that the Check Engine light could mean From something as trivial as a loose gas cap to something major like faulty spark plugs. It usually means a visit to the workshop after which you generally end up with a lighter wallet.
What is Engine Check Light?
Better known as the MIL (Malfunction Indicator Light), the check engine light is a signal from the car’s Engine computer that something is wrong. And yes, your car has a computer called the ECU doing all the math to run more efficiently. Every time you put your car into the ignition, the ECU runs some tests across the powertrain (everything essential for a car to keep delivering power to the wheels) to ensure everything is functional. Lets figure out what it means.
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If it Blinks, its Serious. Period.
If the check engine light blinks while youre driving, you should immediately bring your car to a halt at a safe location. Continuing to drive in such a state could unleash heavy damage to some expensive parts of the car. At times like these, you should consider getting your car towed or getting it checked by a professional mechanic.
But if its a Steady Light?
It isnt something major or an emergency. You can continue driving but should visit a local workshop, as soon as you can, for a quick check-up.
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Most Common Reasons Why Check Engine Light Comes on:
1. A catalytic converter malfunction
It converts harmful hydrocarbons and other toxic gases into less toxic gases. A malfunction could mean bad mileage and could end up with the loss of power to the wheels.
Its unlikely for it to malfunction if the car is maintained well. But if the catalytic converter ends up malfunctioning and requires replacement, it could cost you upwards of Rs.6000.
2. Mass Airflow sensor fault
It helps the ECU decide the air-to-fuel ratio for efficient burning of fuel. It usually means that you havent changed the air filter in a while which chokes the airflow to the engine. It would result in the car stalling, poor idling and bad mileage.
But if the sensor stops working, again its a pretty costly affair to replace. These complex electronics are hard to fix.
3. A loose or open petrol cap
As trivial as it sounds this affects a cars performance, maintaining the required pressure throughout the line and system. It can reduce the mileage and increase emissions too.
If the light goes on, quickly check if its because of the petrol cap. Tighten if its loose or if you see the damage, replace the cap. You should see the light turn off soon enough.
4. Oxygen sensor fault
This sensor monitors unburned oxygen in the exhaust which correlates to the air-to-fuel ratio and efficient burning of fuel. Each exhaust pipe has a sensor and which one is malfunctioning can only be determined with a diagnosis of the ECU. Leave this one to the pros.
Faulty readings could mean poor performance and if left this way could eventually damage the catalytic converter which can cost a fortune to replace.
5. Damaged or old spark plugs
The spark of life ignites the air and fuel mixture in the combustion chamber of the engine. An essential yet small component which doesnt require a change every so often.
If its indeed the bad spark plugs, your local mechanic can replace these in a jiffy and they dont cost much either.
There will be times when even your mechanic finds it hard to figure out whats wrong and it could be just some loose sensor wires. But if your check engine light is coming on too often, your car is getting old and youre asking too much from it. Its about time you sell your old car and let it rest in peace.
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At CARS24, you can sell your old car with peace of mind Minimal paperwork, hassle-free process and instant payment. So dont wait for your old car to stall in the middle of nowhere. Make sure you visit a professional mechanic/workshop if the light blinks. Dont let it burn a hole in your wallet later!
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