VAG Group PQ34 (A4 platform)

"A complete run down on the A4 PQ34 cars, engines and models."

The A4 platform (PQ34 under the revised scheme) first appeared on an Audi A3 in 1996 and went on to be used for many different models across the VW group over the next two decades.

This represented a crossover point for the VW Audi Group (VAG Group) where one platform was used across a wide variety of models.

The earlier Golf "A3" platform, was used on the Jetta Mk3 and Vento and the VAG group saw the benefits of a common platform which allows factories to make different models side by side and reduced development costs.

So this evolved into the A4 Platform, but with the integration of new Marques into the VAG Group the naming convention dropped the common A(x) format and they adopted the PQ34 which shows the car is (P = Passenger Car) (Q=Transverse engine) (3=Compact cars)(4=Mid Sized Cars)

It saw the Audi A3 introduced as a direct competitor to the Golf and allowed VW to introduce a New Beetle version.

By using a common platform, the components and manufacturing costs are reduced as these are shared across models.

The torsion beam rear suspension created lift-off oversteer which although fun, was something designed out in future platforms.

Body panels were generally quite solid and most of these cars have stood the test of time in terms of avoiding rust and maintaining reliability.

Notable engines we would choose were the 1.8T and the 1.9TDi both of which can tolerate fairly large power gains, which are released through a remap.

PQ34 platform cars (Typ numbers in brackets):

Engines used on the PQ34 Platform

Note that not all engines were available for all models, and (there are a few additional engines codes, and some were restricted to limited regions and countries).

Engine Codes and Specs

1.4 1998–2004 AHW/AXP/BCA/AKQ/APE/AUA 55 kW (75 PS; 74 hp)@5,500 rpm 128 Nm (94 lbft)@3,300 rpm
1.6 1998–2000 AEH/AKL/APF 74 kW (101 PS; 99 hp)@5,600 rpm 145 Nm (107 lbft)@3,800 rpm
1.6 2000–2006 AVU/BFQ 75 kW (102 PS; 101 hp)@5,600 rpm 148 Nm (109 lbft)@3,800 rpm
1.6 2000–2006 AUS/AZD/ATN/BCB 77 kW (105 PS; 103 hp)@5,700 rpm 148 Nm (109 lbft)@4,500 rpm
1.6 FSI 2002–2005 BAD 86 kW (117 PS; 115 hp)@5,800 rpm 155 Nm (114 lbft)@4,400 rpm
1.8 1998–2006 AGN/BAF 92 kW (125 PS; 123 hp)@5,900 rpm 170 Nm (125 lbft)@3,500 rpm
1.8 T 1998-2001 AGU/ARZ/ARX/AUM/BAE 110 kW (150 PS; 148 hp)@5,500 rpm 210 Nm (155 lbft)@2,200–4,200 rpm
1.8 T 2001-2006 AUQ/AWP/AWW/AUG 132 kW (179 PS; 177 hp)@5,500 rpm 235 Nm (173 lbft)@1,950–4,700 rpm
2.0 1999–2001 AEG/APK/AQY 85 kW (116 PS; 114 hp)@5,200 rpm 170 Nm (125 lbft)@2,400 rpm
2.0 2001–2006 AZJ/AZH 85 kW (116 PS; 114 hp)@5,400 rpm 172 Nm (127 lbft)@3,200 rpm
2.3 VR5 1998–2000 AGZ 110 kW (150 PS; 148 hp)@6,000 rpm 205 Nm (151 lbft)@3,200 rpm
2.3 VR5 2000–2003 AQN 125 kW (170 PS; 168 hp)@6,200 rpm 220 Nm (162 lbft)@3,300 rpm
2.8 VR6 1999–2002 AAA/AFP 128 kW (174 PS; 172 hp)@5,800 rpm 235 Nm (173 lbft)@4,200 rpm
2.8 VR6 1999–2002.5 AQP/AUE 150 kW (204 PS; 201 hp)@6,000 rpm 270 Nm (199 lbft)@3,200 rpm
2.8 VR6 2002.5–2005 BDF 150 kW (204 PS; 201 hp)@6,000 rpm 270 Nm (199 lbft)@3,200 rpm
3.2 R32 2001–2004 BJS/BML 177 kW (241 PS; 237 hp)@6,250 rpm 320 Nm (236 lbft)@2,800 rpm
1.9 SDI 1998–2006 AGP/AQM 50 kW (68 PS; 67 hp)@4,200 rpm 133 Nm (98 lbft)@2,200–2,600 rpm
1.9 TDI 1998–2006 AGR/ALH 66 kW (90 PS; 89 hp)@4,000 rpm 210 Nm (155 lbft)@1,900 rpm
1.9 TDI 2000–2006 ATD/AXR (Pd) 74 kW (101 PS; 99 hp)@4,000 rpm 240 Nm (177 lbft)@1,800–2,400 rpm
1.9 TDI 1998–2002 AHF/ASV 81 kW (110 PS; 109 hp)@4,150 rpm 235 Nm (173 lbft)@1,900 rpm
1.9 TDI 1998–2000 AJM (Pd) 85 kW (116 PS; 114 hp)@4,000 rpm 285 Nm (210 lbft)@1,900 rpm
1.9 TDI 1999–2001 AUY (Pd) 85 kW (116 PS; 114 hp)@4,000 rpm 310 Nm (229 lbft)@1,900 rpm
1.9 TDI 2001–2006 ASZ (Pd) 96 kW (131 PS; 129 hp)@4,000 rpm 310 Nm (229 lbft)@1,900 rpm
1.9 TDI 2000–2003 ARL (Pd) 110 kW (150 PS; 148 hp)@4,000 rpm 320 Nm (236 lbft)@1,900 rpm

You can find links to the engine tuning guides below, which provides a wealth of information on how to improve the performance of these engines.

Even though swapping engines from a different platform is sometimes easier, a few can be a real challenge but many of these would be strong candidates for engine replacements and swaps.

There are a few problems and issues to look out for on VAG group engines, but I've split these off into other articles.

  1. 2.0 TFSi carbon buildup issues - direct injection engines require an intake clean.
  2. 2.0 TFSi problems - N75 and N249, high oil consumption,  Cam Follower wear, Water Pump failure, and Turbo issues
  3. 2.0 TDi problems - Flywheel, Oil pump,  Lumpy Idling
  4. 1.8T Problems - Diagnosing the common faults and issues

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