Check Engine Light On After Oil Change? [Diagnosis & Fixes]

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Changing your transmission’s oil after a while? Probability is you will see car’s engine light on after oil change lit like a Christmas tree! Check engine light usually denotes OBD2 system has found something fishy in your car’s system ranging from minute to a major fault. Do you know why it happens? Or how to solve it? Don’t worry, I got you!

Can Engine Light Come On For No Reason?

I know to spot that tiny orange light can activate stress hormones in your brain, but Don’t worry! It necessarily doesn’t denote there is any serious issue with your beloved car. Most of the problems are in fact harmless and quite easy to fix. Reasons may be many, but you mustn’t ignore it. Rather take it to a trustworthy mechanic and fix the issue.

engine light on after oil change

Reasons Why Engine Light On After Oil Change

While there can be many reasons your car’s computer is trying to warn of, but I will note here a few most prominent one that is: engine light on after oil change. If done correctly, as an essential part of maintaining an oil change done recently will not affect the system or lead to triggering check engine light. But if you do, beware as something is seriously wrong. Below are the few most prominent reasons behind the problem faced:

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1. Faulty Oxygen Sensor

The oxygen sensor in your car is responsible for efficient fuel burning and increase or maintain mileage. If it is malfunctioning, you may miss the important data required for proper utilisation of fuel which in turn leads to an unwanted increase in expenses. Your precious dollars wasted, so good-bye to weekend binge-watch! On average, there are 3 sensors in the car in total. Fault can be in one or more than one, which your mechanic will find out.


2. Faulty Spark Plugs

In the process of conversion of fuel into energy, spark plugs play the most important role. They are responsible for the sparks which lead to activation of the combustion chamber thus starting your vehicle. Due to excessive pressure on them, they wear over with time and need to be replaced soon. According to experts, one should get them replaced after 120,000 miles of travelling for better health of the car and a mess-free car luxury.

3. Malfunctioning Catalytic Converter

Another prominent and the costliest issue can be malfunctioning catalytic converter, if your system runs out of it, the engine light will shine brightly for sure. This part of your car does the job of reducing pollution caused by your system by converting harmful gases and smoke into a less polluted one. It is also needed for proper acceleration without lagging.

4. Damaged airflow sensors

These sensors have the responsibility of sensing whether the accurate quantity I fuel is passing through the engine or not. It is based on the principle of airflow and checks for faulty streaming. When it is damaged, you will spot poor performance of your car, drastically reduced mileage and increased pollutants and smoke emission.

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5. Displaced Gas Caps


The most ignored issue and probably the most irritating one is loose gas caps, the reason may be voluntary or involuntary. It may lead to leakage of precious fuel into internals thus damaging both internals and wasting fuel. It can create havoc and dig a big hole in your pocket.

engine light on after oil change

Is It Safe To Drive With check engine light on?

If you think of avoiding the signs and continue operating it without paying heed to the situation, DON’T! Although you can take some time to repair if you spot blinking, you need to buckle up and solve the underlying issue without any delay. Otherwise, it can put your life under serious hazard. Moreover, if you continue driving you may trigger damage to spread to other parts of the system like wildfire. It’ll certainly increase the damage repair cost exponentially.

Always remember, ” A stitch in time, saves nine!

Some of you may simply turn off or reset the signal light but that will not solve the root cause and it will remain ignored. Doing so can make the condition more severe.   Credits: Car Engine Light Blinking

How Do I Turn My Check Engine Light Off?

Now after going through problems faced during engine light on after oil change, you must be wondering about how to get rid of this problem? Well, no worries. We got you!

Since I have written an elaborated blog about this earlier so I will give you a sneak peek at that and at the same time answer your query perfectly! So in case you want to go deep into the topic, just check out that blog. Try to figure out the root cause by visually spotting any abnormality in the car’s behaviour. Incase everything seems fine, or you can’t troubleshoot, take it to the nearest garage. Make sure to drive at a slow pace avoiding sharp turns.

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Try DIYs

Why not do it yourself? Thanks to the internet, everything is now a bed of roses. Wanna know something? Google it!

Hire A Mechanic

Although it is contrary to what I saved above, getting your hands dirty can sometimes be risky. To avoid complications, I suggest taking professional help.

Buy A Diagnosis Kit

Many cheap smart kits are available these days, use them to scan your car’s tools to find faulty components.

Binding Up

So that was all in today’s blog. One advice for you: Always use branded and high-quality kinds of stuff for your dear car rather than trying to save a few bucks. Secondly, never miss your car’s maintenance sessions, if you do, be ready for many problems coming on your way!

Hope you like today’s blog and your queries are solved, if not kindly let me know in the comment section.

Thank you

Happy reading!

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