Hello, on a given occasion ( dieverse Treads ) I would like to briefly present a so-called manual error reading (only 850er) . The control function can be triggered by pressing the button at the diagnostic output “A ” . When entering the code you press briefly and clearly on the button ( 0,2 – 5 seconds ) The immobiliser must be deactivated before and the ignition must be on ! with the pictures the pin is plugged on 2 box A ( 2 = ECU injection layer ) e ) press briefly and count the Blinkcode Example 1 – 1 – 1 means = without finding error memory empty error codes are read in the order in which you are stored, i.e. according to the FIFO principle. If the row is full (max. 7 error codes) the last stored code is cancelled if it has a lower priority than the new error code. There is of course a list of the codes, which would be too extensive to set here, I recommend either hyanes or sequence ndes Buch in deutschBand 1290 vom bucheli Verlag. there is the complete code list in it. Mennzer Box A 1 Automatic 2 Control unit Injection system 3 ABS 5 Turbo Control unit 6 Control unit 7 Combination instrument with speedometer tank display etc. Box B 1 Automatic air conditioning ECC 2 Tempomat 5 Airbag 6 el. Seat adjustment 7 Heating