What are the three versions ?
There are a couple of different versions/engine codes:
US Market Volkswagen
2000 Golf/Jetta: AWD
2001 Golf/Jetta: AWW
2002+ Golf/Jetta: AWP
1997-1999 Passat: AEB
1999-2001 Passat: ATW
2001 Passat: AWM
2002-2004 Passat: AMB
1999-2000 Beetle: APH
2001+ Beetle: AWV
2002 Beetle Turbo S: AWP
US Market Audi
1997-1999 A4: AEB
2000 A4: ATW
2001 A4: AWM
2002 A4: AMB
2000-2001 TT 180hp: ATC
2001-2004 TT 180hp: AWP
2001-2002 TT 225hp: AMU
2003-2004 TT 225hp: BEA
BUT, here are the most popular 1.8T:
Volkswagen Engine Info
Engine Code: AWD
Model Years: 2000 (11/99 on)
Compression Ratio: 9.5:1
Horsepower (SAE Net): 150hp @ 5700RPM
Torque: 155ft. lbs.@ 1750RPM
DP Size: 55mm
Turbo: K03
OE Boost: .6 Bar
Engine Code: AWW
Model Years: 2001 (07/00 on)
Compression Ratio: 9.3:1
Horsepower (SAE Net): 150hp @ 5700RPM
Torque: 162ft. lbs.@ 1950RPM
DP Size: 50mm
Turbo: K03s
OE Boost: .6 Bar
Engine Code: AWP
Model Years: 2002+ (06/01 on)
Compression Ratio: 9.5:1
Horsepower (SAE Net): 180hp @ 5500RPM
Torque: 174ft. lbs.@ 1950RPM
DP Size: 55mm
Turbo: K03s
OE Boost: .8 Bar
Audi Engine Info
Model Years: 1997-2000
Compression Ratio: 9.5:1
Horsepower (SAE Net): 150 @ 5700 RPM
Torque: 155 ft. lbs.@ 1750 RPM
DP Size: 50mm
Turbo: K03
OE Boost: .6 Bar
Model Years: 2001-2005
Compression Ratio: 9.3:1
Horsepower (SAE Net): 170 @ 5900 RPM
Torque: 166 ft. lbs. @ 1950-5000 RPM
DP Size: 50mm
Turbo: K03s
OE Boost: .6 Bar