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Old 01-25-2013, 08:38 AM   #1
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I rolled into my local NAPA this morning and they informed me that they don't check the lights code due to it only provides several possible problems.

They said to only way to be sure is to take it and get it professionally scanned? Is this true? I want to fix the problem and get the light off .

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Old 01-25-2013, 08:41 AM   #2
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Or you can buy a scanner...

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Old 01-25-2013, 08:41 AM   #3
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I know my local autozone and oreillys dont check the codes anymore, Finally just bought the reader, definatly worth it.
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Old 01-25-2013, 08:46 AM   #4
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Advance Auto will still check codes. and pulling a code can definitely point you in the right direction of a problem....
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Old 01-25-2013, 08:50 AM   #5
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Key in ignition..... on-off-on-off-on

(do not start )

Should give you CEL codes on your odometer display... then research codes via PC....
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Old 01-25-2013, 10:53 AM   #6
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Yep turn your ignition switch on-off-on three times within 5 seconds & then leave it on. Give it time & it will then display any diagnostic trouble codes that are stored. If you do it right it will always at least display the word Done.

This works for all TJs except 98-00.
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Old 01-25-2013, 01:37 PM   #7
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I have tried it on a 2005 tj all i get is the check engine light blinks 10 times
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Old 01-25-2013, 01:52 PM   #8
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Quote:
Originally Posted by TnDz TJ
Key in ignition..... on-off-on-off-on

(do not start )

Should give you CEL codes on your odometer display... then research codes via PC....
Thanks TnDz TJ and Jerry!

P0133 is the code
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Old 01-25-2013, 01:54 PM   #9
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My local autozone still checks codes.
They won't "clear the codes" for you anymore, some kind of company policy I guess. But he let me borrow his code reader while he had it hooked up, so I could clear them myself
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Old 01-25-2013, 01:54 PM   #10
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advance auto will still check codes. And pulling a code can definitely point you in the right direction of a problem....

x2
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Old 01-25-2013, 01:58 PM   #11
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Thanks TnDz TJ and Jerry!

P0133 is the code
O2 sensor, slow response.
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Old 01-25-2013, 02:14 PM   #12
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A few years ago I bought one of these scanners and I probably use it a dozen times a year on my vehicles (mostly on my diesel truck that is chipped) and friends vehicles to read and clear codes. Worth the $60 alone to not have to work with Autozone bozo's.

CAN OBDII Code Reader with Multilingual Menu
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Old 01-25-2013, 02:15 PM   #13
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my 05 says "DONE" so I am guessing its because I have no codes stored. Maybe try a different number of on-off-ons...... Now that I think of it I did use it a while back ... the gas cap was left loose and the code was shown on my Odometer .
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Old 01-25-2013, 02:15 PM   #14
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my 05 says "DONE" so I am guessing its because I have no codes stored. Maybe try a different number of on-off-ons
Done = No codes
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Old 01-25-2013, 02:16 PM   #15
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I read a thread that I think said that this was caused by pumping the gas pump multiple times to fill up.

Is that true? Because I definitely have been doing that.

Or do I need to replace the O2 sensor ?
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Old 01-25-2013, 02:29 PM   #16
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As stated... The O2 is slow to read. Replace it.
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Old 01-25-2013, 03:03 PM   #17
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Advance Auto will still check codes...
For those of us here in California, such stores are no longer legally allowed to do that. Only shops with certified repair staff are allowed to pull codes.
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Old 01-25-2013, 04:56 PM   #18
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For those of us here in California, such stores are no longer legally allowed to do that. Only shops with certified repair staff are allowed to pull codes.
Sounds like a pretty silly law.. As for the ignition on and off trick, I completely for got about that. I use my code reader for everything. Great little investment, everyone should own one...
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Old 01-25-2013, 05:09 PM   #19
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I had purchased a bluetooth OBD2 elm reader off the internet a few years ago, never got it to work, tried with laptop and Android tablet. Not sure if was because my 2001 Mazda truck was not compatible or not? Unfortunately a quick item to pond Maybe someone else can make it work... Cabled version are extremely reliable, I may reinvest in one soon just for the sakes of owning one.
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Old 02-14-2013, 12:01 AM   #20
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Yep turn your ignition switch on-off-on three times within 5 seconds & then leave it on. Give it time & it will then display any diagnostic trouble codes that are stored. If you do it right it will always at least display the word Done.

This works for all TJs except 98-00.
Just tried this on my 98se. Worked but didnt display any codes. Still want to get an actual reader tho.
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Old 02-14-2013, 12:08 AM   #21
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Sounds like a pretty silly law..
Its Kalifornia...what do you expect?
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Old 02-14-2013, 06:21 AM   #22
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I rolled into my local NAPA this morning and they informed me that they don't check the lights code due to it only provides several possible problems.

They said to only way to be sure is to take it and get it professionally scanned? Is this true? I want to fix the problem and get the light off .
Parts guy's are Not Mechanics/Technicians Just becuase a certian code is set does not always mean a part is bad some codes will affect other codes,It's a sales tool for places like Auto Zone they will say well you have a Po300 (Random Misfire code) so you will need to do a full tune up spark plugs-distributor cap & rotor + plug wires, While that may fix the code it may not what if the PO 300 is caused by other issues like a vacuum leak or other issue? They do no testing & just read codes there is more to it than that! As a ASE Master Tech & I also have the ASE L1 Advanced Level Engine Performance Certification I have seen quite a few vehicles that have had parts thrown at them with almost No testing done! many times if basic troubleshoting was done the problem would have been found & many $ that were wasted on unneeded parts saved.
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Old 02-14-2013, 10:08 AM   #23
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Parts guy's are Not Mechanics/Technicians Just becuase a certian code is set does not always mean a part is bad some codes will affect other codes,It's a sales tool for places like Auto Zone they will say well you have a Po300 (Random Misfire code) so you will need to do a full tune up spark plugs-distributor cap & rotor + plug wires, While that may fix the code it may not what if the PO 300 is caused by other issues like a vacuum leak or other issue? They do no testing & just read codes there is more to it than that! As a ASE Master Tech & I also have the ASE L1 Advanced Level Engine Performance Certification I have seen quite a few vehicles that have had parts thrown at them with almost No testing done! many times if basic troubleshoting was done the problem would have been found & many $ that were wasted on unneeded parts saved.
Funny, they have never used it as a sales tool toward me. The light came on on my wifes truck on Monday. Stopped by Advance to have the code read and he said misfire on #4 cylinder. I said thanks and left. Light came on on my TJ on Tuesday. Took it to Auotozone to have it read at lunchtime. He printed out the results and I said thanks and left. Tightened my gas cap up, borrowed a scanner and turned the light off. I have actually gone into Advance and said can I borrow your scanner to check a code and they have let me take it to the parking lot. Once the guy said they werten't allowed to turn the light off so he looked the other way while I pushed the yes button. They can only turn it off if you have a repair reciept for the issue. None of them have ever tried to diagnose the issue.
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Old 02-14-2013, 10:13 AM   #24
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Funny, they have never used it as a sales tool toward me. The light came on on my wifes truck on Monday. Stopped by Advance to have the code read and he said misfire on #4 cylinder. I said thanks and left. Light came on on my TJ on Tuesday. Took it to Auotozone to have it read at lunchtime. He printed out the results and I said thanks and left. Tightened my gas cap up, borrowed a scanner and turned the light off. I have actually gone into Advance and said can I borrow your scanner to check a code and they have let me take it to the parking lot. Once the guy said they werten't allowed to turn the light off so he looked the other way while I pushed the yes button. They can only turn it off if you have a repair reciept for the issue. None of them have ever tried to diagnose the issue.
I guess it just depends on the store & actual employee,I have saw quite a few that have had every part under the sun thrown at the problem & the soloution was simple once actual testing was done.
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Old 02-14-2013, 10:48 AM   #25
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I guess it just depends on the store & actual employee,I have saw quite a few that have had every part under the sun thrown at the problem & the soloution was simple once actual testing was done.
Probably does, but if a ASE Master Tech is diagnosing a problem and his paid allotted time to diagnose it runs out, he starts throwing parts at it. You would wish he wouldn't but he can't make money working for free trying to diagnose the problem.
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Old 02-14-2013, 09:18 PM   #26
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Parts guy's are Not Mechanics/Technicians Just becuase a certian code is set does not always mean a part is bad some codes will affect other codes,It's a sales tool for places like Auto Zone they will say well you have a Po300 (Random Misfire code) so you will need to do a full tune up spark plugs-distributor cap & rotor + plug wires, While that may fix the code it may not what if the PO 300 is caused by other issues like a vacuum leak or other issue? They do no testing & just read codes there is more to it than that! As a ASE Master Tech & I also have the ASE L1 Advanced Level Engine Performance Certification I have seen quite a few vehicles that have had parts thrown at them with almost No testing done! many times if basic troubleshoting was done the problem would have been found & many $ that were wasted on unneeded parts saved.
This is true...I've seen many times where Autozone reads a code and sells that part...In my area O2 sensor codes seem popular...O2 stuck rich? Replace it....What alot of people don't realize is a code is simply that the engine computer doesn't like a particular reading...it does not mean that particular part is bad...I mean, install a new O2 sensor but don't plug it in...It'll throw a code...Does that mean the sensor is bad?...No, it means the computer doesn't like the readings...

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