check engine light codes read for free, where?

  • Last Updated:
  • Aug 28th, 2010 1:08 pm
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Jan 28, 2005
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DragonZealot wrote:
Oct 23rd, 2009 1:26 pm
If you plan to drive to the States I think Autozone or Pepboys would do this for you for free. Check with them.

You can get this scanner for $30 and hook it up to your laptop to display/reset the code.

If you are in Toronto I prob can do this for you free.
Have you used this scanner?
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Mar 12, 2005
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gamer123 wrote:
Oct 23rd, 2009 6:23 pm
the markham location that i went to did it for free, twice.
same with me.
mccowan and 7 location does it for free if anyone is looking
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manteiv wrote:
Oct 23rd, 2009 3:45 pm

make sure you buy the tool that support the CAM protocol (all cars after 2004 use this protocol)
It's the CAN protocol.

You can get a scanner from Princess auto when it goes on sale. That maxitrip computer could probably do it as well.

If it was just the gas cap, the CEL might not disappear until after you take a few trips with the car.

Always take note of the code though, because it is a piece of information that will help you or your mechanic in diagnosing the problem.

There is nothing wrong with just getting the code cleared to see if it as random one off. But if it does reappear then you should get it addressed.
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Jul 13, 2006
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Do NOT just clear the code without finding out what it is. My example from this weekend:

- Wife's car threw a CEL while on the way to a kids' concert, in traffic, rain, and dark.
- Wife called, I said "I'll check it tomorrow -- go enjoy the concert and don't worry about it if its not a flashing CEL (misfire)"
- Check the code the next day -- P0703. WTF -- unusual code. Check the service manual and find out it's a BRAKE LIGHT SWITCH MALFUNCTION!!
- I verify that the brake lights were 100% NOT WORKING. So my wife drove over 60km in heavy traffic, rain, and at night... without working brake lights. :eek:

(I fixed the problem -- blown fuse under the hood, hopefully it doesn't come back again. I left her a spare set of mini-agu fuses and showed her the location of that one, so if a CEL is thrown and I'm not around, she can check that fuse first-thing and make sure she's at least driving safe).
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librakhan wrote:
Oct 22nd, 2009 11:52 pm
if you dont want to know the code that came up then just unplug the neg on the battery for 5 min and it should reset but it will also reset the car computer.
Don't forget to write down your radio code as well then :P
Find some one local that has a ScanGaugeII
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sounds like backfiring/misfire

if you come to my garage i can help you out :)
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devilmaycry wrote:
Aug 27th, 2010 10:46 pm
I need help on how to troubleshoot a check engine light. My check engine light comes off and it's hard to start, slow to accelerate and there's a black smoke. Can someone help me on this? thanks
The light is on? Or "comes off", whatever that means?
If the light is on and you have drive-ability problems, the ECU may have gone into "limp" mode. It is protecting the engine from something that has gone wrong.
Take it either to the dealer or someone that specializes in your car (or to a shop that has access to the electronic diagnostics for your car).