The 5 Most Common Check Engine Problems

You're driving home from work one day when the worst nightmare for a car owner happens: the 'check engine' light pops on. It comes without warning and with no explanation. For most drivers, this means a trip to the mechanic, but it's not difficult to diagnose (and sometimes fix) yourself.

Photo by Robert Couse-Baker.

As Jalopnik recently pointed out, the check engine light is one of the most frustrating and confusing facets of owning a vehicle. It's just a light with no information telling you what the problem is. It's a cry from a baby with no explanation. But you can do a few things yourself before heading into the garage for costly repairs.

Unless your car starts smoking or stalls completely, head over to an auto parts store and have them run a diagnostic to find the cause of the check engine light. Call ahead and make sure they can handle your make and model, since some cars have special computers (and only larger auto shops will offer that service). Once you're at the store, they'll come out and plug a small computer underneath your dashboard and read back a code stating what happened to the car.

According to a study conducted by CarMD, five common malfunctions cause the check engine light to come on, and several of them are simple to fix yourself. Let's take a look at the most common issues.

1. Replace Oxygen Sensor

An oxygen sensor is a part that monitors the unburned oxygen from the exhaust. It helps monitor how much fuel is burned. A faulty sensor means it's not providing the right data to the computer and causes a decrease in mileage. Most cars have between two and four oxygen sensors and the code you get from the scanner will tell you which one needs replacing.

What causes it: Over time, the sensor gets covered in oil ash and it reduces the sensor's ability to change the oxygen and fuel mixture. A faulty sensor not only reduces fuel efficiency, it also increase emissions.

What you should do: Not replacing a broken oxygen sensor can eventually lead to a busted catalytic convertor which can run you thousands of dollars. Taking your car into a garage will cost you a couple of hundred, depending on the car. However, an oxygen sensor is easy to replace on many cars and the process is usually detailed in the owner's manual. If you know where the sensor is, you only have to unclip the old sensor and replace it with a new one. Regardless of how you approach it, you should get this fixed right away.

2. Loose or Faulty Fuel Cap

You wouldn't think a fuel cap would be that important, but it is. When it's loose or cracked, fuel vapours leak out and can throw the whole fuel system off. This causes a reduction in fuel efficiency and increases emissions.

What causes it: If you get an error pointing to the fuel cap it means fuel vapours are leaking out of your cap. This means the cap is either cracked or just wasn't tightened well enough.

What you should do: If your car isn't feeling jerky or strange when the check engine light comes on, the first thing you should check is the fuel cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a fuel cap at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve fuel mileage.

Photo by Chris Chan.

3. Replace Catalytic Convertor

The catalytic convertor works to reduce exhaust gases. It converts carbon monoxide and other harmful materials into harmless compounds. If your catalytic convertor is failing, you'll notice a decrease in fuel mileage or your car won't go any faster when you push the accelerator.

What causes it: Catalytic convertors shouldn't fail if you're keeping up on regular maintenance. The main cause of failure is related to other items on this list, including a broken oxygen sensor or deteriorated spark plugs (we'll get to those in a second). When it fails, it stops converting carbon monoxide into less harmful emissions.

What you should do: If your catalytic convertor fails completely, you eventually won't be able to keep the car running. Your fuel efficiency will also be terrible, so you should try and fix it as soon as you can. Unfortunately, the average replacement cost is in the thousands, and you can't do it yourself unless you're an experienced mechanic.

Photo by noricum.

4. Replace Mass Airflow Sensor

The mass airflow sensor tells the car's computer to add the proper amount of fuel based on the air coming through to the engine. A faulty one can increase emissions, cause the car to stall and decrease fuel mileage.

What causes it: Most mass airflow sensors fail because of a improperly installed (or never replaced) air filter. You should replace the air filter at least once a year to help prevent the airflow sensor from failing.

What you should do: Theoretically, you can drive for a few weeks or even months with a broken MAF sensor. You will notice that you're using more fuel, and over time the car will eventually start stalling a lot. At a shop, the replacement cost will be a few hundred dollars, depending on the car, but that's usually the cost of parts because the labour is relatively simple. It's not terribly difficult to do on your own, but the process is quick enough you may want to let a mechanic handle the project in case the sensor doesn't end up being the issue.

5. Replace Spark Plugs and Wires

The spark plug seals the combustion chamber and provides a gab for a spark to jump across and initiates combustion in your engine. When the plugs are failing, the spark plugs misfire. You'll feel a little jolt in your car's acceleration when this happens.

What causes it: Most spark plugs in cars from before 1996 should be replaced every 40,000-50,000 kilometres. Newer ones can last up to 160,000km. Still, plugs fail over time, and there's not much you can do about it.

What you should do: Get them replaced right away. It's easy and cheap and your car will run better for it. If your spark plugs fail and you've made your way to the auto parts store, you can replace them easily following the video above. Since this is part of your vehicles regular maintenance, the spark plugs are usually easily accessible from the hood of the car. It's simple enough that I've seen people doing this in the auto parts parking lot on several occasions.

Plenty of other possibilities for a check engine light are out there, but the above five are the most common. How long do you usually let the check engine light stay on before you do something about it?


Comments

    Get a bluetooth OBD2 dongle and Torque on your Android phone. Will allow you to do the diagnostic yourself and - another step in the process that isn't mentioned in the article - clear the warning light once the cause is fixed.

      +1 Works even better on an Android tablet.

      Any suggestions as to what's a good dongle available in Australia?

        Not an Australian source, but http://www.dealextreme.com/p/obdii-bluetooth-car-diagnostic-cable-black-blue-orange-dc-12v-42825 is cheap and works for me. US$21.90 delivered.

    "head over to an auto parts store and have them run a diagnostic to find the cause of the check engine light"

    I can't imagine ANY auto parts stores in Australia offering that service. Any advice on what to do here (other than buying your own OBD2 dongle)?

      Its common in America

    thats cause most of them have an arm of the business which does repairs, so it will be better for them to refer you to there to get it fixed.

    Ahh guys, if u check this out abit more I think u may find that this is actually USA specific info. (all the faults relate to the emissions management system; the whole check engine light thing relates to USA legislative requirements ...)

    Ahh guys, if u check this out abit more I think u may find that this is actually USA specific info. (all the faults relate to the emissions management system; the whole check engine light thing relates to USA legislative requirements ...)

    If you have more than 3000kms on your current oil it might be worth sending off an oil sample to a lab to ensure there isn't a lot of wear occurring in your engine. I use roktex who post out a sampling kit.

    Hi I own a astra Holden 1.8litr hatchback car
    I fixed all the idler pully tensioner and serpent belt replaced ok then did the water pump replaced and replaced the crankshaft sensors coz the scanner said it malfunction that’s why the engine light was on but not flashing now I did all that and now it’s pulling back on 1st gear only on take off grrrr
    The engine light is still on days later and I still can’t get it of I need help anyone pls

      Sorry it’s a 2002 model equip

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