Do I have to buy a code reader or is there another way to get the codes? (like the fiero)

depends, what kind of vehicle? Is the aldl connector rectangle or like a trapazoid? How many of the 16 terminals are in the connector?

You will more than likely need a Scantool like the GM Tech 1 or Tech 2. Autozone can also scan codes for free with their scantool.

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James Essar
88 Coupe 3.2L V6 With NX Nitrous
92 Mitsu. Eclipse GS (for sale)
94 GMC Jimmy

that is why I am asking, not all '95s were obdII computers, so they can still be checked using the paperclip method. But the '95 lumina and monte carlo cannot be checked except by a dealer or shop. And autozone can check codes. I work for them.

Black86SE is correct

I have a 95 Corsica with a 3100 SFI.. not OBDII but you can not use a paperclip on it cuz it only has one pin in the ALDL connector(data Tx/Rx)...it has the oh so wonderful 8192 baud you can make an interface cable and hook up to a laptop and read the codes...

here is more info for making a cable (much like the 160 baud in the fiero just a wee bit different)...
http://www.techedge.com.au/vehicle/aldl8192/8192hw.htm

-Darius

it is a monte carlo so I guess I will have to go to auto zone tomarrow..

Thanks for the info..

Chances are they won't be able to read them because of my comment earlier. They are not able to read them because they require a special tool that only dealers and shops have.

What about a '94 Corsica w/3.1..??
I just picked one up for the daughter yesterday..

ok I have an old style plug and cant check it by crossing the conections. Dose this mean that only a gm dealer can read the codes? Or is there another way?
And how much is it going to cost to get my ignition key copied?

Thanks for the help guys