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How do i test codes and find out what the codes mean

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  • Cars & Trucks Master
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Most code readers will give an explanation of what the code means or will be supplied with a chart to refer to for code explanation! If you do not have a code reader take it to a garage to be read!

Posted on Nov 30, 2014

  • Angela Barnett Nov 30, 2014

    Thanks Mikey. Will it work on codes on modules? Having a four wheel drive issue. Do they plug code reader into module itself? And lastly can an auto parts store read it?

  •  Mikey
    Mikey Nov 30, 2014

    Most vehicles register fault codes when there is an issue, by plugging a code reader into the OBD2 diagnostic plug any faults will be held and can point to where the fault is! Any garage that carries out servicing should have a code reader and be able to offer this to you!

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What does code dtc3 fail mean on my emissions test,,97 nissan pathfinder


I means that the vehicle failed it's emissions test as it failed the digital trouble code reading test 3
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What does code P0401 mean ?


egr fail.
read the FSM on how to test it and solve it.
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if not get it serviced,
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so get it fixed? no engine size posted. so ???? impossible to be accurate.
or DIY, you have tools? and skills. to do that.
it means the Oxygen sensor has issues.
means bank 2 is stuck rich
bank 2 means car is V6. bank 2 means bank with #2 cylinder loc.

for much better, reasons and test. see here

http://www.scantool.net/software/alldata-diy-1-month-subscription.html

is this the only DTC code.??? no others, and did you use a scan tool
that can read all Toy codes, like P1xxx ? codes factory codes.
if not you missed the boat.
my wild guess. (i do tests in real world)
bank 2 is rich.
due to what?
1: misfiring, ever do a tune up? see fouled spark plugs bank 2, look.
2: injector leaking.

there are lost of tests, im not going to list them all.
but it takes tools and time.
compression at spec. bank 2?
OIL FOULED SPARK PLUGS, there, oops.
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1 Answer

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im pretty sure you were doing a selft testing dtc bye turning switch on and off.

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Dear Brad: There are many auto parts houses out there which now offer free scanning for codes. Auto Zone is just one such retailer that offers this free service. They will scan the car for free giving you the codes and what the codes mean, but will not go into any great depth ans to what they mean unless you happen to get lucky and the person who does the scanning happens to be a tech. As far as I know, there is no means of testing for codes other than through the factory test tool or another generic test tool. As far a looking up what the codes mean, once you know what the codes are, you could go down to a book store like Barns and Noble and find a repair manuel that has the references. You don't have to buy the book to look up the code meanings and solutions, you can just write down the findings. Good luck

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