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You’re driving along and suddenly your Check Engine Light
comes on. What does it mean? Check Engine Light, Check Engine Soon
Light, Service Engine Soon Light, Engine Light, Engine Management
Light, "whatever" you want to call it, simply means that
your vehicle’s computer system has detected a problem.
Depending on the year, make, and model, it may be related to the
engine, the transmission, even the brakes and suspension. There
are literally hundreds of reasons a Check Engine Light may appear.
The following questions and answers discussion will clarify the
truth about Check Engine Lights…
Service Engine Soon Light FAQ:
1) Can the car be driven?
The general rule is: if the Service Engine Soon Light is on, and
the car seems to be running ok, you can drive it. However, you
should have it checked at your earliest convenience.
If your vehicle is running poorly—bucking, stalling, hesitating,
or you just don’t feel safe, tow it. When in doubt always
tow it!
2) The check engine light went out by itself. Is it ok now?
Probably not. Check Engine Lights often come and go. Even if the
light is out, your vehicle’s computer system will retain
information that will allow the problem to be diagnosed. To avoid
potential long term issues, get it checked out.
3) My check engine light stays on. What should I do?
If your check engine light stays on constantly, follow the instructions
above, under “Can the car be driven?” Don’t panic.
4) Can I disconnect the battery, or pull a fuse to reset the service
engine soon light?
Maybe, but I wouldn’t. Removing the battery cable or an
ECM or PCM fuse may clear the code, but it is not universally recommended
in the industry. Most manufacturers advise against it. See the
Best Way to Reset Check Engine Light Codes below.
5) What is the Check Engine Light?
The Check Engine Light is a warning light for multiple systems
operating in your vehicle. In simplest terms, it’s like an
engine management warning light to alert you of a problem. Just
like your computer pops up with an “error message window” saying
that something’s wrong, your service engine soon light pops
up to warn you that it has detected a malfunction: mechanical,
technical, software, or otherwise.
6) How to Reset Check Engine Light?
This is a great question! I get it all the time. See the guide
below.
Resetting Check Engine Light:
First, if your Check Engine Light is on, it’s on for a reason.
The Check Engine Light indicates that your vehicle’s on-board
computers have stored a fault code. There are hundreds of fault
codes, any one or more could be stored in the computers memory.
Fault codes are critical for accurate diagnoses of the problem.
Sometimes the fault code points directly to a faulty component,
allowing for a quick diagnoses and repair. Other times, the code
may only indicate a problem circuit and thus extensive diagnostic
procedures may be required.
By resetting the Service Engine Soon Light, it erases important
fault code data that turned the check engine light on in the first
place. Without this critical information, the root problem can
not be discerned.
Unfortunately, there is no "universally" accepted way
to safely turn off a check engine light. Even if there was, if
the root problem is not addressed, it will come back on.
So whether it’s a Chevrolet Service Engine Soon Light, Camry
Check Engine Light, Mighty Max Check Engine Light, or a 1993 Thunderbird
Check Engine Light, they require individual procedures to diagnose,
repair, and reset the check engine light code.
Following is a Safe and FREE way for resetting check engine light
codes.
Best Way to Reset Check Engine Light Codes:
If you’re not interested in diagnosing your truck, SUV or
car Check Engine Light, or it’s already fixed, and you just
want the engine light out, visit any local repair shop. Most shops
will have a universal Check Engine Light Code Reader that can quickly
and safely reset, and check engine light trouble codes. It should
take about 30 seconds.
Note: European models are better off with a specialist, and some
older vehicles may require more time.
Here’s what to do:
Politely ask your local service center (ask a technician if you
see one) if they could reset the check engine light with their
Check Engine Light Code Reader. They may protest, arguing that
the problem must first be diagnosed.
Tell the service representative that you understand fully, and
that you appreciate his professionalism. But that you would just
like to try resetting the Service Engine Soon Light, and if it
comes on again, you’ll come back for a full diagnosis.
Be genuine. Service representatives respond positively to sincerity.
If the service center wants to charge you just to reset your Service
Engine Light, try another facility.
Alternatively, some parts store such as NAPA and AutoZone will
reset your check engine light for free. Be wary of "diagnostic
ideas" from parts representatives, however. Don't let them
sell you any parts to "try" to fix the problem.
IMPORTANT, check engine light repairs can be quite costly given
their technical nature. Service centers can easily hide behind
complex technical language to inflate the difficulty of your Check
Engine Light concern.
About The Author
Theodore P. Olson (Ted) holds extensive certifications from Mercedes-Benz,
Toyota, Genral Motors, ASE, and more. Ted is the author of 8
books and numerous articles on the automotive service industry.
http://www.repairtrust.com
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