This sticker have severall information regarding your car (engine code, gearbox code, paint code, trim code and all the option codes). The engine code is the first information on the 4th line (highlighted in red in the image on the left).
Audi Forums A4 Series A4/S4 forum (B5 Chassis) A3steve Registered User Joined Sep 8, 2006 Messages 131 Reaction score 1 Points 16 Location NULL Jul 30, 2010 #1 Hi Folks, I've a had a search and cant find the info, so sorry if this has been asked before. I believe the TDI came in 3 variants - 90,110,115
1.8 Liter 4-Cyl. 5V Turbo (engine codes: AEB, ATW, AWM) 1.8 Liter 4-Cyl. 5V Turbo (engine code: AMU, ATC) 1.8 Liter 4-Cyl. 5V Turbo (engine code: AMB) 2.0 Liter 4-Cyl. 4V Turbo (engine code: BPG) 2.0 Liter 4-Cyl. 5V (engine code: ABA) 2.7 Liter V6 5V BiTurbo (engine code: APB) 2.8 Liter V6 5V (engine codes: AHA, ATQ) . 306 754 158 184 400 284 426 126