do it yourself by linking out te1 and e1 with a paper clip, then turn the ignition on and the engine check light will flash up codes with a squence

like on off on off on delay on off on off on off on

=34 etc, it will keep cycling them from the second you turn the key, so if theres a code it will be repeated over and over.

its in the bgb if you have a copy

Graeme