Sorry for posting here, but my question posed over on alt.autos.neon on the
10th has gone unanswered.
Wife's 2000 neon has the stoopid check-engine idiot lite on. After a day or two
... or nine ... it goes out only to come back on again a few days later. Where
about's is the harness to connect to a code reader ....... and before I go out
and buy one of those critters does the obd work with neons? I see as far as the
OBD series goes there seems to be one for every sized pocketbook.
Also, Wot's the difference between the '2-in-1' unit and the 'scantool' unit -
both are priced the same .... ?
Good news is that my '91 Dodge diesel is still going strong after 375,000 and
still getting about 30 mpg if the speed is kept reasonable.
The code readers should work with all cars made after 1996,as far as i know
they all have OBDII on board.
The readers are not too expensive nowadays,I got one on Amazon.com for like
40 bucks. There's one here for $32
(Amazon.com product link shortened)fea4c111c256ee0111dca9b45902d6&itemPosition=8&qid17176649&sr=8-8
The socket to plug it in is usually hidden just under the the dash by the
steering wheel,you'll probably have to bend your head under to see it. It
looks like this :
They are easy to use. Or like someone else said,you can go to Autozone and
ask them to connect a reader to get the trouble codes for you,which they
should do for free. Although they are not allowed to clear the codes,you
have to have that done yourself,which you can do with your own reader
Some vehichles (if not all) can display the ODBII codes on their
odometer by turning the ignition key from off to on 3 times and
leaving it in the on position on the 3rd time, or other little tricks
to activate it.... Check around and see if someone knows the trick
Basically with code readers you are deciding on what features you want
by the price you pay.
If you want a tool that ONLY shows you the generic code and allows you
to clear it than the cheapest OBDII readers do that.
Want to be able to read/clear the codes and not need to look up the code
explanation? Then there is a version of the above tool with that option
in it. Be advised that both of these ONLY show the basic codes, they
don't cover the manufacturers specific codes.
This one also covers some manufacturers codes.
Then if you want to be able to read codes, PLUS read live data (limited
coverage) ability to read captured data and be able to read manufacturer
specific codes then you need to step up a bit more. This unit also can
cover non OBDII vehicles with the correct cables.
Now if you want to go the next step BUT don't want to go to a high
dollar unit but would like a much more advanced tool the latest unit
they have is nice.
You can find similar levels of tools from other makers. These are just
some examples of DIY type units.
What separates these from the dealer type units is that these can read
most codes, and can see some of the data. However they cannot be used to
read data other than engine related information. So for instance if the
ABS light comes on they are not usable for that. Or if the transmission
acts up they may not read those codes.
The other item is that the dealer type machines also can be used to test
certain items or cycle different controls on the vehicle.
(for instance the SEL light on that Neon sounds like it is probably
emissions related, a standard code scanner may tell you that it is a
code P0442- EVAP system small leak. However that small leak could be
anywhere in the EVAP system. There are a few solenoids and valves along
with some simple tests that can be used to isolate the fault. A code
reader and most of the DIY code scanners do not allow you to control
those items. The dealer unit does.)
Does that mean that the DIY units are worthless. NOPE. Because 99% of
repairing the fault lies with detective work on the part of the tech.
Anyone who has worked for a few year on autos will say the same thing,
DON'T TRUST THE CODES, the are not always true.
An example: The code reader says code P0300 - Random/multiple
cylinder misfire detected.
Some folks would read that code and say "YUP, it's bad plugs and
wires". Others might say "Sounds like a failing coil" and others might
say "Check the cap/rotor". Who's correct? Maybe one of them OR maybe
NONE of them. Random misfires could be caused by the above, they could
also be caused by faulty injectors, a dirty or blocked fuel filter, a
bad fuel pressure regulator, bad fuel pump or even just a bad tank of fuel.
That is when you get to be a detective and look for the real problem. Do
the codes help, YES. Do they always point out the correct solution to
the problem. NOPE.
The amount of help relates to what info the scanner gives you. Also
don't buy more tool than you will be able to use. If you plan on not
doing your own ABS work or plan on taking it to a dealer for any major
faults you could get by with a lower end tool. You might even be able to
help a neighbor/friend when they have a problem.
Well, I bought a reader and it showed a code of p0139 - 02 circuit slow
response Bank 1, sensor 2 ......... just what I thought ..... cigarette lighter
isn't getting enough oxygen!! Without a service manual I guess I'm still bogged
in the mud, but since clearing the code it hasn't returned in a couple of days
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