Can Check Engine Light Turn Itself Off? QUICK FIX!

Yes, a check engine light can turn itself off if the underlying issue responsible for the light being on is fixed.

The check engine light might get turned on once in a while, maybe as a result of some kind of technical failure.

When some system fails to pass a test twice, the check engine light gets turned on, for the light to get turned off it will take nothing less than 40 passes to achieve that.

When the engine light comes on, it does so to notify the driver that there is a problem.

As we have earlier stated, it comes on when the system fails to pass a test, the test could be engine timing, continuous misfire, etc.

Now for the light to get turned off, it takes the system to pass whichever test it initially failed three times before the engine light will go off.

Why Does The Check Engine Light Turn Itself Off?

The check engine light turns itself off after it might have passed all the needed tests, it takes about three times for the engine to pass the test before the check engine light will turn itself off.

Even after the light turns off, it is best practice to still take the car to your mechanic so some diagnostic check-ups could be done on the car.

Even when the light gets turned off, it is better to find out what exactly the problem was and what got the light turned on in the very first instance. Better safe than sorry I suppose.

The light might as well have gone off if you did a lot of highway driving before you decided to have the oil changed, doing so will enable the car specifications to drop back to normal.

If the engine light comes on as a result of transitory problems, and after the issue gets solved and the light goes off, it is still best to take the vehicle to the mechanic.

Because even after turning off, the vehicle will go into learning modes but still show an error.

At the auto part store, you take the vehicle to, will read out the error code for you and either help you fix it or they will tell you what you do.

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Is It Safe To Drive With Check Engine Light On?

Depending on the error that caused the engine light to come on.

You shouldn’t drive if the check engine light is flashing as it might cause irreversible damage to the catalytic converter. The reason the engine light might be flashing may be as a result of an engine misfire.

It is however okay to drive your car for a few miles if your engine light is just on but does ensure to have it checked out as soon as possible.

Whether you should be driving your car when the engine check light is on depends on your vehicle, the root cause of the light flashing, and its performance.

The cause of the engine light coming on can be anything between a faulty oxygen sensor, a bad MAF sensor, or a bad catalytic sensor.

There are some needed things to look out for that will aid you in determining if you should keep driving with your engine light turned on or you should not.

The things are:

  • If your dashboard indicates low oil pressure or overheating issues in addition to your check engine light coming on, you should come down from the car and have the engine shut off immediately to prevent further problems
  • If the check light comes on after refueling, consider tightening your gas cap as this might likely be the reason why.
  • If the check engine light is on and it is accompanied by little performance problems, it is recommended you lower your speed, avoid speed surges and erratic shifting, and take it easy on your engine as well until you can have the issue fixed.

The check engine is designed to light up whenever anything goes wrong with either any of the car’s components or sensors.

ALSO SEE: Can Check Engine Light Turn Itself Off?

Check Engine light went off after a week?

If your check engine light goes after a week, then you are experiencing an intermittent problem.

The problem could be as simple as a misfire from a coil that occasionally breaks down, or it can be a small leak like the gas cap or probably a problem with the variable valve control system.

Using a car scanner, you can pull up the error code and find out exactly what is causing the issue.

It is not unheard of for an engine-related light issue to clear itself, but depending on the vehicle, there are some parameters you should meet before the light will clear out after the issue has been sorted out of course.

The best solution is to find a scanner hooked up to ensure there are no pending codes.

Is It Safe To Drive With Check Engine Light On?

Depending on the error that caused the engine light to come on.

You shouldn’t drive if the check engine light is flashing as it might cause irreversible damage to the catalytic converter. The reason the engine light might be flashing may be as a result of an engine misfire.

It is however okay to drive your car for a few miles if your engine light is just on but does ensure to have it checked out as soon as possible.

Whether you should be driving your car when the engine check light is on depends on your vehicle, the root cause of the light flashing, and its performance.

The cause of the engine light coming on can be anything between a faulty oxygen sensor, a bad MAF sensor, or a bad catalytic sensor.

There are some needed things to look out for that will aid you in determining if you should keep driving with your engine light turned on or you should not.

The things are:

  • If your dashboard indicates low oil pressure or overheating issues in addition to your check engine light coming on, you should come down from the car and have the engine shut off immediately to prevent further problems
  • If the check light comes on after refueling, consider tightening your gas cap as this might likely be the reason why.
  • If the check engine light is on and it is accompanied by little performance problems, it is recommended you lower your speed, avoid speed surges and erratic shifting, and take it easy on your engine as well until you can have the issue fixed.

The check engine is designed to light up whenever anything goes wrong with either any of the car’s components or sensors.

Can Check Engine Light Turn Itself Off

Most Common Codes Check Engine Light

Some common codes you can use to check the engine light include:

  • Oxygen sensor code (P0171-P0175):

This code specifically deals with sensing your oxygen level. And it ranges between PO171-PO175 with PO171 telling you that your car is receiving either too little or much.

PO172 means your system has too much gasoline but not enough oxygen in the system

PO173 has to do the engine control module, this code gets triggered when the compensation ratio of air to fuel is either too lean or too rich, the engine control module can fix this issue but when the compensation is too much the alarm will be triggered

PO174 this code tells you when the air coming into your Mass Air Flow Sensor is less than the supposed air that is meant to go into it.

PO175 this code is the same as that of 173, telling you the system is rich, having too much gasoline and less oxygen in the engine.

  • Engine Misfire Code (P0300-P0305)

The PO300-PO305 deals with an engine misfire.

PO300: This code gets triggered when you have an engine misfire related to multiple cylinders.

PO301: This code gets triggered when your system has an engine misfire related to cylinder 1.

PO302: This code gets triggered when your system has an engine misfire related to cylinder 2.

PO303: This code gets triggered when your system has an engine misfire related to cylinder 3

PO304: This code gets triggered when your system has an engine misfire related to cylinder 4

PO305: This code gets triggered when your system has an engine misfire related to cylinder 5

  • Evaporative system codes (P0411, P0440, P0442, P0446, P0455)

The Evaporative System codes deal strictly with the Evaporative System

PO411: This code gets triggered when the secondary injection system has an incorrect flow that is detected.

PO440: This error code appears when your fuel vapor system is leaking or malfunctions of the vapor pressure sensor

PO442: This error is a result of a faulty evaporative emission control system.

PO446: This happens when there is a malfunction in the evaporative emission control system vent circuit.

PO445: When there is a leak in the emission control system, it can also be a result of a bad vent control valve.

  • Exhaust Gas Recirculation Code (P0401)

PO401:  This error comes up when the Exhaust gas recirculation system flow is not sufficient.

  • Catalytic Converter Code (P0420, P0430)

PO420: Alerts you when the catalytic converter is not functioning well at the Max Efficiency, either as a result of a fault with the oxygen sensors or because it needs replacement

PO430 shows up when there is a problem with the catalytic system, misfire codes, or oxygen sensor codes.

Why Does It Mean When Your Check Engine Light Comes On And Then It Goes Off By Itself?

The reason why your check engine light might come on and then go off by itself might be as a result of loose gas caps.

It could be a result of some other underlying issues as well.

Does Check Engine Light Go Off By Itself?

Yes. Check Engine Light will go off by itself when the underlying conditions causing the light to come on have been fixed

How Long Does It Take For Check Engine Light To Go Off?

It takes roughly around 10 to 20 cycles before the check engine light will go. The check engine light will only go off after a set period where it gets to check all of its sensors and pass the test.

Can You Turn Off Check Engine Light Permanently?

Yes, but to turn it off permanently, you will need to have the check engine light deleted permanently by using an OBD2 scanner.

How Did My Check Engine Light Turn Off By Itself?

The check engine light will turn itself off when the issue causing the light to turn on in the first place gets settled.

Will The Check Engine Light Turn Off By Itself?

Yes. The check engine light will turn off by itself if the conditions that caused the issue are remedied.

Can I Disable Check Engine Light?

Yes, this however will force the computer to refresh its saved state through a reboot.

Turn off the light, reconnect your car battery and then turn on the ignition.

Why Won’t My Check Engine Light Turn Off?

Your check engine light might not get turned off if the underlying issue that made it come on is not fixed.

Author: Mechanic Mike Besso

Hi There, I am Mike Besso and this website is dedicated to the automotive industry. I have been a mechanic for many years and my experience includes fifteen specialization in heavy commercial work as well as private cars. I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). I worked for a long time at Global Rebound Automotive companies (Toyota, TATA, BMW, Nissan, TVs, and Others ) as a Mechanic and Mechanics Supervisor. I hope to share some of my knowledge with others.

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