should be printed on a label inside the front page of your service book, will also list what options were factory fitted, well in options code format that is, but will clearly state engine code.
PD or CR refers to the injection system. Pumpeduse(pd) were the 1.9 and 2.0ltrs fitted to b6 and b7 A4s. The B8 onwards got the superior common rail(CR) engine.
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