Hello Brent and thanks for answering my email First I Dont understand I downloaded the scan tool I think I need a a scanner to read the codes and I believe its the OBD1 I want to know where I can get one . I am putting a 3.3 subie in a 91 vanagon I have already put 2 subarus in my other 2 vans .I appreciate all the help I can get Billy Sinor Hey Billy: If you have a 3.3 subaru engine, it's likely between the years of 1992-1997. Those beasts were OBD1 up until 1996 when they went to OBD2. So, I'm taking foregranted that your engine is from 92-95 and is OBD1. As you probably know, it is possible to read codes from the OBD1 engine ECU by connecting the test connectors which are typically located close to the ECU in the wiring harness. Did you do the wiring harness? Then you'll know where those connectors are. Theres' two sets. I'll refer you to a writeup I have on my website to tell you more about getting codes from the ecu: Go to my website, Choose Engine I > Wiring > Idiots Guide to Subaru EJ ECU Codes also see Engine I > Wiring > Table Listing of Computer Codes for the Subaru Engines Now, I am guessing that you already know how to get the codes using a light but want to hook up with a scanner/pc. I am in the midst of this project as we speak. Here's how I'm going about it. There are OBD1 code reader scanners available on the market. They usually run from $70USD and up. They typically allow you to read and reset codes. I have chosen to instead use a software application, developed by a fellow subaru enthusiast (and free). He can be contacted at v@graphics.cornell.edu. He's also got some very informational content available on the internet at http://www.graphics.cornell.edu/~v/b10scan/ As per his guidance, I'm connecting to the engine for OBD1 using the Select Monitor, a yellow plug with 9 pins which should be located close to the ecu in your wiring harness. Now you could just wire off of certain pins on the ecu or even shove individual connectors into the Select Monitor to get your connection but by far the simplest method is to fabricate a cable which will connect the select monitor and adapt to a parallel cable which will then connect to your pc. As per the available instructions, I'm using a subaru stereo adapter cable which happens to be the same size and shape as the Select Monitor so it'll work great for the connection. I'll solder three of the connector wires into wires from my cannabalized pc printer cable which will provide me with a complete connection cable. Pins 2, 3, and 9 of the stereo (select monitor) connect to pins 13, 1, and 25 of the parallel cable (in that order). It's likely that either youre thinking "this is too complicated" or that you are falling asleep by now.....I don't blame you, just go and look at the webpage that the author wrote to get some good pictures and better instructions. Anyway, once I've got the cable and have downloaded and configured the software to run on my laptop pc, it's just a matter of plugging in the cables, turning on the ignition, and using the software. I am building my cable long enough so that I can have my laptop on the passenger seat if needed. Hope that helps. Brent www.weidefamily.net/vanagon/ Pin Description 1 Strobe 13 Select 25 Ground http://cgi.ebay.com/ebaymotors/93-04-SUBARU-IMPREZA-RADIO-STEREO-WIRE-INSTALL-HARNESS_W0QQitemZ8055711297QQcategoryZ38636QQssPageNameZWDVWQQrdZ1QQcmdZViewItem