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How Your Check Engine Light Works

Posted August 21, 2022 7:16 AM



Have you ever had an experience like this in Royal Palm Beach, FL? You drive through the one of those automatic car washes. When you get to the end, where the dryer is blowing, your Check Engine light starts flashing!

You fear the worst, but within a block or two, the light stops flashing, but stays on. By the next day, the light is off.

You wonder; "What was going on?" Well, it's actually a good lesson in how the Check Engine light works.

Your air intake system has a sensor that measures how much air is coming through it. When you went under the high-speed dryer, all that air was blasting past the sensor. Your engine computer was saying, there shouldn't be that much air when the engine is just idling. Something's wrong. Whatever's wrong could cause some serious engine damage.

Warning, warning! It flashes the Check Engine light to alert you to take immediate action.

It stopped flashing because once you were out from under the dryer, the airflow returned to normal. Now the engine control computer says the danger is past, but I'm still concerned, I'll keep this light on for now.

Then the Check Engine light goes off in a day or two.

The condition never did recur, so the computer says whatever it was, it's gone now. The danger is past, I'll turn that light off.

Now a flashing Check Engine light is serious. You need to get it into Brake World as soon as possible. But if it stops flashing you can wait a few days, so you have time to see if the problem will clear itself or if you need to get it checked. How does the computer know when to clear itself?

Think of it this way. The engine control computer is the brain that can make adjustments to manage the engine. Things like alter the air-to- fuel mix, spark advance and so on. The computer relies on a series of sensors to get the information it needs to make decisions on what to do.

The computer knows what readings are in a normal range for various conditions. Get out of range, and it logs a trouble code and lights up the Check Engine warning.

The computer will then try to make adjustments if it can. If the computer can't compensate for the problem, the Check Engine light stays on.

The computer logs a trouble code. Some people think the code will tell the technician exactly what's wrong.

Actually, the code will tell the technician what sensor reading is out of parameters. It can't really tell him why, because there could be any number of causes.

Let's say you're feeling hot. You get your heat sensor out – a thermometer – put it under our tongue and in a minute or two you learn that you have a fever of 104 degrees F (40 degrees C).

You know your symptom – a fever – but you don't know what's causing it. Is it the flu, a sinus infection or appendicitis?

You need more information than just that one sensor reading. But it does give you a place to start and narrows down the possible problems.

There are reports on the internet telling you that you can just go down to an auto parts store and get them to read your trouble code or buy a cheap scan tool to do it yourself.

There are two problems with that. First, the computer stores some trouble codes in short term memory and some in permanent memory. Each manufacturer's computer stores generic trouble codes, but they also store codes that are specific to their brand.

A cheap, generic scan tool, like you can buy online or that the auto parts store uses, doesn't have the ability to retrieve long-term storage or manufacturer specific codes. Your Royal Palm Beach, FL, service center has spent a lot of money on high-end scan tools and software to do a deep retrieval of information from your engine control computer.

The second problem is that once you've got the information, do you know what to do with it? For example, a very common trouble code comes up when the reading on the oxygen sensor is out of whack.

So the common solution is for the auto parts store to sell you a new oxygen sensor — which is not cheap — and send you off on your way. Now your oxygen sensor may indeed have been bad and needed replacing. But the error code could have come from any of a dozen of other problems.

How do you know the right solution? Back to the fever analogy, do you need surgery or an aspirin? Leave it to the pros at Brake World. Give us a call and let us help you resolve your check engine light issue.

Brake World
1213 N State Rd 7
Royal Palm Beach, FL 33411
561-798-3949
http://www.westpalmbeachautorepairs.net



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What People Say About Us

Royal Palm Beach
  • , 09/29/2022

    Brake world has always been an amazing auto repair shop. The managers and staff are courteous, honest and very timely in handling any of your repairs. I can honestly say that I have never been displeased with any of their work, including the fair pricing, their warranties, and they will always get your job done as soon as possible.

  • , 02/13/2021

    Amazing service! I've been a loyal customer for over 22 years. Wouldn't trust any of my vehicles with anyone else. Moty takes care and pride in his work and business. You won't find decent and reasonable pricing anywhere else.

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    , 02/02/2021

    Great Service for a affordable price. They have an outstanding customer service and no hidden fees. They have worked on my 2003 Avalanche to my 2020 Nissan Altima outstanding job.

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    , 01/31/2021

    Great service, been there a couple times. Honest service and good work.

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    , 01/13/2021

    My brakes were in rough shape, Brake world did an amazing job on my car. Driving like brand new, great price too. I will be going back and I will highly recommend.

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    , 01/12/2021

    Just left and I had to stop and make sure I gave them a review. I had a nail in my tire and had to rush here cuz I wouldn't have made it to work. They are efficient and work quickly. There were other people waiting on services and I was in and out in 30min. Amazing professional staff and management. Thank you!! I will definitely be using this company again.

Call us for service: 561-513-5071

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