Help on instrument part number, AutoCheck

Can anyone help me with the differences between instrument with part number 4A1 919 033 DJ and 4A1 919 033 AH?
Mine is AH and this has AutoCheck function. But this function is
damaged, and I am buying a used instrument. What I know is that DJ is for a 2.6 and mine is 2.8.
Please advice.
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