Ook deze info kwam ik tegen:
https://www.audi-sport.net/xf/threa...ne-codes.14784/

All S3s are VVT and DBW, but the VVT system differs. APY are mechanical VVT, AMK and BAM are electrical operation of VVT

110 kW (150 bhp) Engines in A3

AGU
12/96 - 07/98
Drive: FWD
Emission: Non-VVT, EU3
Throttle: cable
Injectors: small
Turbo: K03
Gearbox: EVS, EGY

AQA (not available in UK)
Date: 08/98 - 04/01
Drive: Haldex 4WD
Emission: ?
Throttle: ?
Injectors: big
Turbo: ?
Gearbox: ?

AUM
Date: 05/00 -
Drive: FWD
Emission: VVT, EU4
Throttle: drive-by-wire
Injectors: big
Turbo: K03sport
Gearbox: EBN, ENJ, ESV, FDC

ARX (Not available in UK)
Date: 09/00 -
Drive: Haldex 4WD
Emission: VVT, EU3
Throttle: drive-by-wire
Injectors: big
Turbo: K03sport
Gearbox: FEX (5-speed, short gearing)

ARZ
Date: 09/00 -
Drive: ?
Emission: VVT, EU3
Throttle: drive-by-wire
Injectors: big
Turbo: K03
Gearbox: ?


132 kW (180 bhp) Engines in A3


AJQ
Date: 11/98-08/00
Drive: Haldex 4WD
Emission: non-VVT, EU3
Throttle: cable
Injectors: big
Turbo: K03
Gearbox: ? (5 Speed)


APP (Not available in UK?)
Date: 07/99-05/00
Drive: Haldex 4WD
Emission: non-VVT, EU3
Throttle: cable
Injectors: big
Turbo: K03
Gearbox: ?

ARY
Date: 09/00 -
Drive: Haldex 4WD
Emission: non-VVT, EU3
Throttle: drive-by-wire
Injectors: big
Turbo: K03sport
Gearbox: FHA, FEK (6-speed)


AUQ (not available in UK)
Date: 05/00 -
Drive: FWD
Emission: VVT, EU4
Throttle: drive-by-wire
Injectors: big
Turbo: K03sport
Gearbox: EHA


154 kW (210 bhp) Engines in S3

APY
Date: 11/98 - 09/00
Drive: Haldex 4WD
Emission: VVT (mechanical), EU3
Throttle: drive-by-wire
Injectors: big
Turbo: K04
Gearbox: ? (6-speed)

AMK
Date: 09/00 - 04/02
Drive: Haldex 4WD
Emission: VVT, EU3
Throttle: drive-by-wire
Injectors: big
Turbo: K04
Gearbox: ? (6-speed)

165 kW (225 bhp) Engines in S3

BAM
Date: 08/01 - 05/02
Drive: Haldex 4WD
Emission: VVT (check), EU3
Throttle: drive-by-wire
Injectors: big
Turbo: K04
Gearbox: ? (6-speed)

The easiest way to tell if you have a drive-by-wire throttle on your Audi/VW/Seat/Skoda is to simply look for an 'EPC' (Electronic Power Control) light on the dashboard when you turn the ignition on. All A3s from facelift MY01 have DBW but not necessarily VVT.

To tell if VVT when looking into the engine compartment from the grill, look to the right side of the engine block and there'll be a black cylinder mounted. This is part of the crank sensor. The sensor itself is on the other side of the engine.