The Check Engine/Service Engine Soon light comes on when there is an emissions, ignition, fuel system or transmission related failure. This light does not mean that you just need routine maintenance. … If the light is flashing, this is more serious.

What can cause the service engine light to come on?

  • Faulty or Loose Gas Cap. This is one of the first things you should check if the service engine light comes on. …
  • Low Fluid Levels/Scheduled Service Overdue. …
  • Contaminated Gas. …
  • Malfunctioning Oxygen Sensor. …
  • Wires And Spark Plugs. …
  • Faulty Mass Airflow Sensor.

Is it bad if my service engine light comes on?

The check engine light — more formally known as the malfunction indicator lamp — is a signal from the car’s engine computer that something is wrong. … If the light begins flashing, however, it indicates a more serious problem, such as a misfire that can quickly overheat the catalytic converter.

What does service engine light usually mean?

The service engine soon light means just what it says – that you should have your engine serviced soon. … Since the sensors that turn on the service engine soon light are often triggered by a malfunction in the emission control system, the problem could be as simple as a missing or ill-fitting gas cap.

How do you fix a service engine soon light?

  1. Loose fuel cap. This is by far the cheapest cause for the Service Engine Soon Light to come on. Simply turn off the engine, remove the fuel cap, and tighten it back up again. …
  2. Low fluid levels. You can very easily check and fix this one too, while you’re at home.

Can low oil cause service engine soon light?

Low oil pressure: If your car is low on oil, it can cause your check engine light to go off. This is often shown in its own glowing light along with the check engine light on the dashboard. Overheating: If your car’s engine temperature is heating up, it can once again trigger the check engine light.

Is the service engine soon the same as check engine?

The “Check Engine” light is a notification that something is wrong, the range can be anything from a loose gas cap to a faulty ignition coil. … The “Service Engine Soon” light indicates that your vehicle is due for its next service maintenance.

Can you drive with check engine light on?

The rule of thumb is that if the check engine light is flashing, you can’t keep driving the car. It’s an emergency. Often it indicates an engine misfire. If you keep driving, you will likely cause irreversible damage, mostly to the (expensive) catalytic converter.

How much does it cost to service engine?

The dealer engine service, which you need every 30,000 miles, is the one that’s going to hit you deeply. Expect to pay an absolute minimum of $250 and up to $1,000, depending on the work that needs to be done.

Can AutoZone check service engine soon?

Does AutoZone Scan Check Engine Lights? AutoZone does. If your light is on, and you are wondering why, head down to your local AutoZone where one of our store associates can help diagnose the issue through our free Fix Finder service.

Article first time published on

Why did my check engine light come on all of a sudden?

A loose fuel cap is one of the most common reasons why the check engine light turns on. The cap is a crucial part of a car’s fuel delivery system. … If your check engine light turns on immediately after a fill-up, pull over and make sure the cap isn’t loose — or still on your car’s roof.

What does a solid check engine light mean?

A solid Check Engine Light can mean something like a loose gas cap, or it can indicate a more in-depth problem like a fuel, timing, or transmission issue. Get your car diagnosed, although the urgency isn’t the same as if the light was flashing at you.

Can bad spark plugs cause service engine soon light?

The answer is – yes! Worn spark plugs can cause your vehicle’s check engine light to illuminate, indicating an issue. It may even be a flashing check engine light. This is because bad spark plugs can cause your engine to misfire, which will trigger the check engine light to turn on.

Why is my service engine soon light on after oil change?

A check engine light after an oil change is commonly caused by fitting the oil filler cap backways or oil dipstick not fully seated. Removing and fitting the cap correctly, or seating the dipstick will fix the issue. The engine light may not go out immediately, but likely will within three engine start cycles.

Can low coolant cause service engine soon light?

Low coolant in the radiator of your car can trigger the malfunction illumination light (MIL), also known as the “check engine” light. … Once the PCM detects the anomaly in the coolant system, the ECT fails to communicate the necessary voltage signal from the PCM, which turns on the “check engine” light.

What is a full engine service?

A car service can involve up to 50 or more components, systems checks and adjustments including: An engine oil change and/or filter replacement. Checking lights, tyres, exhaust and operations of brakes and steering. Ensuring your engine is ‘tuned’ to run in its peak condition.

How long does it take to diagnose a check engine light?

A standard diagnostic test can take about an hour to an hour and a half. Of course, more complicated issues that require further diagnosis and where components must be removed for access or testing can take 2-3 hours; depending on the severity of the issue or multiple underlying issues.

What does a full service include on a car?

All services will involve visual checks to your car, like looking for external damage — much like an MOT. … Checks during a car service can include the engine oil, oil filter, lights, tyres, bodywork, exhausts, brakes, steering, fluid and coolant levels, suspension and 12V battery.

Why is my check engine light on and car shaking?

Usually, when the check engine light is on and the car is shaking, that means you’re dealing with an engine misfire. Basically, the check engine light comes on whenever there’s an issue that could increase vehicle tailpipe emissions. … When a misfire is severe enough, you may notice that the engine begins to shake.

How accurate is Autozone diagnostic?

Autozone’s free diagnostic check is not extremely reliable. What they refer to as a “diagnostic check” is just having a code scanner hooked up to the vehicle’s computer. The scanner reads through and finds out what error codes the computer system has registered.

Does O'Reilly do check engine lights for free?

Check Engine Light Testing – Free O’Reilly Auto Parts offers free check engine light testing to help you diagnose the problem. Most of our stores can loan you a code reader for OBD 1&2 systems for vehicles from 1996 and up, except in areas where it is prohibited by law.

How much does it cost to fix engine light?

The costs to fix whatever’s ailing your car — and causing the light to come on — can vary greatly. Repair costs for the most common check engine light problems range from under $20 to almost $1,200, according to CarMD’s analysis of millions of repairs recommended in 2016 in the U.S.

Can a blown fuse cause a check engine light?

Yes a fuse that controls an emissions device can be blown and cause a check engine light.

What are signs of a bad spark plug?

  • Engine has a rough idle. If your Spark Plugs are failing your engine will sound rough and jittery when running at idle. …
  • Trouble starting. Car won’t start and you’re late for work… Flat battery? …
  • Engine misfiring. …
  • Engine surging. …
  • High fuel consumption. …
  • Lack of acceleration.

How much does it cost to fix the spark plugs?

The typical amount you will pay for spark plugs is between $16-$100, while for labor on a spark plug replacement you can expect to pay around $40-$150. It should take the mechanic a little over an hour or so to make the replacement for you.

What does it mean when service engine soon flashes?

When the Check Engine or Service Engine Soon light starts flashing, this means that a catalytic converter damaging condition is occurring. Usually you will be able to feel a noticeable difference in the performance of your vehicle.