VAG-COM Frequently Asked Questions -- Page 1

1.1  Will VAG-COM work with my car?

VAG-COM will work with most Volkswagen and Audi models sold World-Wide 1994 through 2007. It will work with some cars all the way back to model year 1990. It will also work with most late-model SEAT, and Skoda models sold in markets other than North America. If your VW or Audi has a 16-pin "OBD-II style" Data Link Connector,  VAG-COM will definitely work.  If your car has the old "2x2" Data Link Connection, check if there is a wire going to each pin, as shown in the picture. If there are four wires, VAG-COM should work.  If there are only three, it won't.  Please see these Application Charts where you can select your model and see which modules can communicate with VAG-COM.  Also see the Issues page for a few things that may not work as expected.   If in doubt, e-mail us.

1.2  Will VAG-COM work even if my car is "chipped"?

Yes.  If it doesn't work in a "chipped" car, the chip-vendor did something seriously wrong! Chips from reputable vendors do not interfere with diagnostic functions.

1.3  What functions are included in the current release?

VAG-COM is a software program that turns your PC into sophisticated VW/Audi diagnostic tool, which performs the functions as the VW/Audi dealers' own tools. Please see the Function Chart for the current feature set. 

1.4  What  are the computer requirements?

A computer running Microsoft Windows.    A Laptop or "Tablet" computer is best, but a desktop PC can also be used.

With a Serial interface:  We recommend at least a 100 MHz Pentium (or AMD equivalent) with 16MB of RAM and Windows 95 or newer.   Windows 95, 98, ME, NT4, 2000, and XP are all fine.  

With a USB interface: We recommend at least a 500 MHz Pentium-3 (or AMD equivalent) with 64MB of RAM and Windows 98 or newer.  USB interface work best with Windows XP on a 1 GHz or faster PC.    USB interfaces will not work at all with Windows 95 or NT4.

VAG-COM may work on some lesser PC's, but anything less than the above recommendations are "unsupported" meaning if it doesn't work, please don't ask us for help. 

Available disk-space should be a non-issue; VAG-COM requires less than 10 MB.  

Screen resolution can be as low as 640x480.

If you are using a power supply for a laptop, it should be one specifically designed for that purpose, NOT a "universal" adapter.

Systems running Windows in a virtualized environment (for example Virtual PC on a Mac) are not supported.  See also Question 1.8.

1.5  Should I get a Serial or a USB interface?

This depends primarily on the PC you're planning to use:

If you PC has a Serial port, we recommend a Serial interface because they offer the most precise protocol timing possible and do not require any drivers to be installed.    A Serial port looks like this:

Observe the port we surrounded with the GREEN oval. Notice the 9 male pins? That's a Serial port.   Observe the port circled and crossed in RED.  Notice the 15 female pins? That is a Monitor port and will not work!

If your PC does not have a serial port, then you should get a USB interface.   USB interfaces have only one advantage over Serial interfaces:   They work on PCs that don't have Serial ports.    A USB interface is not faster.    However, it is becoming increasingly difficult to find new laptops which still have serial ports, so if your PC has both Serial and USB ports, has at least a 1GHz CPU and is running Windows XP,

USB<->Serial converters are often unable to handle the baud rate and timing requirements that are demanded by many control modules using the VAG protocol. We have had very poor results with most available USB<->RS-232 converters, therefore USB<->Serial converters are "Not Supported."  Please do not ask us for technical assistance if you are using one of these converters.   

If you want to use one of our Serial interfaces on a PC that doesn't have a serial port, we recommend you buy this Quatech SSP-100 PCMCIA-Card.  We don't sell them, but we've had excellent results with them.    We've got installation and configuration notes here.

1.6  What if the PC I wish to use with VAG-COM doesn't have Internet access?

Because our software is provided to you via our download page, rather than on floppy disks or CD's, you will need a way to transfer the Self-Installing EXE file to the PC that you will be using with VAG-COM. The file fits easily on a removable USB drive and can also be burned onto a CD-R or CD-RW. Make sure that you do not run the EXE file until you have copied it onto the PC where you would like VAG-COM to be installed. You do not need to be connected to the Internet while using VAG-COM.

1.7  Can I use VAG-COM on a desk-top computer?

Yes,  but you will probably need an extension cable for your interface.  

We usually stock Serial extension cables in 15' (3m) and  25'  (7.5m) lengths.    You can extend a Serial interface up to 50'.    See the Accessories section of our Store for pricing.

We now also stock an a 16-ft Active USB Extension.   You can extend a USB interface up to 30' with two of these.   We do not sell or support any other brands or models of USB extensions.  if you have problems with a different brand of USB extension,  the first thing we're going to tell you is to eliminate the extension.

1.8  Will there be a Mac or Linux version?

There will be no "native" Mac or Linux versions.  The time and effort required to "port" VAG-COM to these platforms would never be worthwhile. 

One person has gotten VAG-COM running under Linux using WINE -- click here for details.    

Results on IBM/Motorola Power-PC based Macs using Virtual PC vary.  Some people have gotten it to work, but sample rates tend to be poor and the sessions tend to drop frequently.   This is likely inherent in the overhead and latency inherent in the virtualized environment.    Some people have not gotten it to work at all.

Reports from several people indicate VAG-COM works perfectly on the latest Intel-based Macs when these run Windows XP natively using Boot Camp.

1.9  Will there be a Windows-CE/PocketPC/WindowsMobile or Palm-OS version?

Possibly at some point in the future, but we don't have a timetable yet. We conducted a poll of current and potential VAG-COM users about where we should concentrate development efforts. The results:

75 % Improving and adding features to the Windows version
11 % Porting VAG-COM to Windows CE / PocketPC
  9 % Porting VAG-COM to Palm 
  3 % Porting VAG-COM to LINUX
  2 % Porting VAG-COM to Macintosh

Some of our customers use VAG-COM on a tablet PC such as a Fujitsu Stylistic or on an ultra-portable PC such as a Toshiba Libretto. These can be purchased inexpensively on auction sites. These REAL PC's work wonderfully and have very small form factors (the Libretto is about the size of a VHS video cassette).

1.10  What's the difference between VAG-COM and an OBD-II Scan-Tool?

OBD-II is a government mandated diagnostic protocol that is primarily aimed at diagnosing emissions-related problems.   An OBD-II scan tool will work in many different brands of cars.  VAG-COM uses VW's proprietary diagnostic protocol and will only work in VW/Audi vehicles.  Although you can use an OBD-II Scan Tool in an OBD-II compliant (1996 or newer) VW or Audi, an OBD-II Scan Tool can only talk to the engine, not the numerous other "intelligent" systems in the car.   Want to reprogram your central locks or your Radio?  Diagnose a problem with your ABS, Airbags, or Automatic Transmission?  Re-align your Immobilizer after swapping ECU's?  Reset your Service Reminder Indicators?   Communicate with a pre-1996 model (not OBD-II compliant) car?  An OBD-II Scan-Tool can't do any of these things. Please see our OBD-II Page for information on using third party generic OBD-II software through our Interface. Want some reasons to choose VAG-COM over a generic OBD-II scan tool? See this Real World Comparison.  

Our latest version of VAG-COM adds Generic OBD-II functionality, see the Download Page for more info. 

1.11  Can I use VAG-COM to roll back my electronic odometer?

No. A brand new instrument cluster (with less than 100 km on it) can be rolled forward, one time only. Of course, this assumes that the instrument cluster is "diagnostics capable". Not all instrument clusters with electronic odometers are.

1.12  Can I use VAG-COM to "Flash" the chip in my ECU?

No, we have investigated flashing, but found that there are several different methods of encryption for various VW/Audi vehicles, as well as delicate licensing issues to overcome. Therefore, we do not intend to pursue flashing any further at this time. You cannot alter boost, timing, fueling, rev limiter, or speed limiter with VAG-COM. You should contact a chiptuner if you wish to have those parameters altered.

1.13  Is there anything else I need to make full use of VAG-COM?

Yes.  A good Factory Repair Manual  containing the the VAG Scan-Tool procedures for your car.   VAG-COM is a tool, not an on-line service manual. We could not possibly document everything you can do with it in every year and model of VW/Audi that VAG-COM can be used with.

For US and Canadian VW and Audi models, the best source are the Official Factory Repair Manuals by Robert Bentley Publishers.    Please note that Bentley also has some publications called "Service Manuals".   These tend to be less complete than the Official Factory Repair manuals and are not recommended for use with VAG-COM.  

Since the above Bentley Factory information only applies to US/Canadian vehicles, if your car is European-spec or from the rest of the World, they may be of little use to you.

For Rest-of-World VW, Audi, and SEAT manuals, check erwin-portal.com

For Rest-of-World Skoda manuals, check skoda-haendlershop.de (currently German-only)

Home 
    Products   
        VAG-COM
            Support
                F.A.Q Index
                    F.A.Q Page 1   F.A.Q Page 2   F.A.Q Page 3   F.A.Q Page 4   F.A.Q Page 5