Serial Vag-Com For Audi Cars

I bought a OBDII when I got my A8 in 2004 to work with all audis up to 2003. This is the serial version and not USB. The only problem is not many new laptop has serial port any more except some Dell models or IBM. Anyhow, the software is free from Rosstech website . We can’t do a lot with this free version, but for reseting and setting some options, it’s extremely handy. We use an old-old laptop from Dell which has a serial port with windows2000.

The serial OBDII online for about $35 back then that works wonder.

obdII serial interface

Where to hook it up to in A8

under the dash is the OBDII hook up

Check Engine Light & Airbag are on

dash lights on

Hook up to serial port on laptop, TURN ON THE IGNITION TO AC with all lights are ON.

serial port on laptop

hook up to serial port

Execute the VAG-COM Release 311-2.exe file, we will have some port configuration problems.

file to execute

com port not configured

auto detect and test com1 to work

Control Module Selected

Select engine for “Check Engine Light” and it shows Fault Codes – 02

Engine Controller shows Fault codes -02

Click Fault Codes -02 to see codes and click clear codes -05 to clear the codes.

Check engine light fault codes

The fault codes is cleared

Now go back to select control module to select airbag to clear airbag codes and follow the same procedure.

airbag fault codes

Clear codes and check start the engine to see if all lights are gone.

All lights are off

Please read the Ross-Tech instruction carefully and choose the OBDII correctly, because this one really access the car CPU module which can be corrupted with wrong code writing and the car becomes dead. Well, that’s what they say, try with your own risks as always.

Cheers,

idog

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