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Engine code AHF, ALH, ASV — VW

Engine code AHF, ALH, ASV on VW: 12 steps, engines AGP, AGR, AHF, ALH. What to remove, in what order, and what to check after.

Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.

12 steps 6 engine codes

🧭 Before you start

Fits: VW Golf IV / Bora (1J)

  • Renewed: turbocharger

Don't miss

  • Connect fault readerV.A.G 1551 or vehicle diagnosis testerV.A.G 1552 with cableV.A.G 1551/3 and select engine electronics control unit with "“address word”" 01. The engine must be at idle when doing this: 01

🔧 Engine codes this applies to

AGPAGRAHFALHAQMASV

📋 Procedure

  1. Connect fault readerV.A.G 1551 or vehicle diagnosis testerV.A.G 1552 with cableV.A.G 1551/3 and select engine electronics control unit with "“address word”" 01. The engine must be at idle when doing this: 01
  2. Press keys 0 and 8 for "“Read measured value block”" function and confirm with Q key.
  3. Press keys 0, 1 and 1 for "“Display group number 11”" and confirm entry with Q key.
  4. Indicated on display:
  5. Accelerate vehicle in 3rd gear from approx. 1500 rpm using full throttle.
AGP? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. At approx. 3000 rpm, press PRINT button on fault readerV.A.G 1551 or vehicle diagnosis testerV.A.G 1552 .
  2. Carry out final control diagnosis and actuate charge pressure control solenoid valve: 01
  3. If the rod moves and the charge pressure specifications are not obtained, renew turbocharger.
  4. Check charge pressure control solenoid valve N75.
  5. Check vacuum hoses .
  6. Connect hand vacuum pump with accessoryV.A.G 1390 to charge pressure control valve and check linkage for freedom of movement.
  7. If linkage does not move easily, renew turbocharger.

Other VW procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.