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How do I get the obd1 codes from my 95 olds 98 without a scanner?

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If your ALDL connector is a 16 pin (looks like an OBD2) but your GM vehicle is 95 or 94 then the only way to scan the codes is with a scanner. http://reddevilriver.com/aldl.html

Posted on May 06, 2014

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Posted on Jan 02, 2017

mmantelli
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SOURCE: i want to check obd1

under your dash where the ALDL is located the rectangle plug on the drivers side you take a jumper wire and jump it with the key off from the test terminal to the ground terminal the two upper right plug holes then turn the key on DO NOT START IT!!!!! then the service engine soon light will flash code 12 it will be one flash a short pause then two flashes after another slightly longer pause the code will repeat itself two more times that says the diagnostic syatem is working if there is nothng wrong 12 will repeat itself over and over but if there is a problem it will flash the code 3 times then code 12 3 times and the next code if there is more than 1 code stored then you can look in a haynes manual or manual of the sort and it will tell you which each code is or you can go to an auto parts house and they can hook it up to the scanner for free then tell you what you need

Posted on Aug 02, 2008

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SOURCE: where do I connect the obd1 scanner for a 95 grand marquis

try under the hood, drivers side, near the hood hinge. against the firewall. will be an almost rectagular shape. may or may not have a cover that covers the terminals. kinda behind the strut tower.

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Posted on Feb 19, 2009

  • 14036 Answers

SOURCE: 94 & 95 Geo Tracker obd1 cable

you need the same brand cable.

Posted on Apr 06, 2009

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SOURCE: 95 park avenue, how do I read the obd1 codes thru the car

you have a obd2 it has 16 data link connector you have to use scanner to get codes.now the obd1 system have 12 data link connectors..the top two at far right is where you put jumper wire to retrieve code.

Posted on May 13, 2009

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1 Answer

How to get code without obd1


A 1995 model Buick should be OBD2 which would require a scanner or code reader. If it is an OBD1 system you can jumper two terminals on the test plug to make the warning light flash.

Sep 07, 2012 | 1995 Buick Century

1 Answer

95 jetta comm error message on obd1


I suggest visit some Autozone or Autoshop with OBD scanner reader, in order to know what fault code is stored there; sometimes they make this job for free. Note the code and come back again.

Mar 26, 2012 | Cars & Trucks

3 Answers

When I plug my scan tool into the computer of my 95 S10 jimmy, there is no communication. I tried replacing the omputer and got the same.


Okay, what you may have on your hands here is what has become known as an obd1.5 computer setup. Some of the 94's and 95's were made in anticipation of the switch to the obd2 set up. To determine if you fall in to this category locate your vehicle's computer. If it is under your hood in the engine compartment and you have two oxygen sensors and the port for your scanner fits an obd2 scanner then you have an obd2 system and your inability to link is either an electrical issue or something wrong with the computer itself.

If the computer is not in the engine compartment, you have one oxygen sensor, and the port for your scanner is rectangular you have an obd1 system.

If your computer is not in the engine compartment, you have one oxygen sensor and you have an obd2 scanner port you have an obd1.5.

Obd1 systems can be checked with an obd1 reader or much more easily with a paper clip or jumper wire. Just google something to effect of obd1 paper clip method. If there is still no communication once again you more than likely have an issue with your computer or electrical system.

If you have a true obd1.5 system do not fret there is still hope :) Yes there are some obd2 scanners that will work on these and there are some reportedly fancy obd1.5 code readers, however the easiest (and least expensive) way to pull the codes from this system is to use a modified version of the paper clip method. Instead of using your paper clip or jumper wires on terminals A&B, jump terminals 5&6.

Look at your scanner port. Count the terminals on the top row starting from the left. There should be connections in terminals 4, 5, and 6. Connect the jumper to terminals 5 and 6 and turn the key to the 'on' position (without turning the engine over). Your check engine light will flash. Each code will be two digits long and will flash three times (sort of like morse code). The first one will be a 1 and a 2, thus code 12. This code can be overlooked as it is just stating that the computer is being jumped. The codes that follow are the ones you should take note of.

These two digit codes correspond to the two digit obd1 codes. You can find their definitions on any number of websites. I personally prefer the haynes troublecode book though as it includes some make specific information.

Good Luck!

Apr 25, 2010 | 1995 Chevrolet S-10 CA Edition

1 Answer

Where do i connect the wires to make the tachometer work i have a 95 gmc sonoma 4 cy


a light green or white wire in harness above brake booster.


a side note, what scanner do you use to get codes. my 95 has obd1 system with obd2 connection, does yours, thanks

Feb 18, 2010 | 1995 GMC Sonoma

1 Answer

95 park avenue, how do I read the obd1 codes thru the car


you have a obd2 it has 16 data link connector you have to use scanner to get codes.now the obd1 system have 12 data link connectors..the top two at far right is where you put jumper wire to retrieve code.

May 13, 2009 | 1995 Pontiac Sunfire

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