Checking boost pressure: VW (PG)
Step-by-step checking boost pressure for the VW (PG): factory workshop text. What to remove, in what order, and what to check after.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📋 Procedure
Idling adjustment OK.
=> Repair group 24; Digifant injection and ignition system; Servicing injection part
4-Cyl. injection engine (G charger), Mechanics
Digifant injection and ignition system
Servicing injection part
Engine oil temperature min. 80 °C
Vacuum hose to Digifant control unit OK.
Knock sensor OK.
▸ 07.92
=> Repair group 28; Digifant injection and ignition system; Checking knock sensor ▸ 07.92
4-Cyl. injection engine (G charger), Mechanics
Digifant injection and ignition system
Checking knock sensor ▸ 07.92
08.92 ▸
=> Repair group 01; Self-diagnosis; Interrogating and erasing fault memory
4-Cyl. injection engine (G charger), Mechanics
Self-diagnosis
Interrogating and erasing fault memory
Connect turbocharger tester V.A.G 1397 or V.A.G 1397 A (test connection II) between fuel pressure regulator and intake manifold.
Open turbocharger tester V.A.G 1397 cut-off valve or select measuring range II of turbocharger tester V.A.G 1397 A.
Start engine and run at idling speed.
Pull connector off CO potentiometer and coolant temperature sender (blue).
Fully open throttle abruptly. As soon as a charge pressure of
at least 0.6 bar
is attained whilst engine is revving-up, the rpm must periodically rise and drop back (engine hunts).
If the minimum charge pressure is not attained:
Clamp-off hose between idling stabilization valve and by-pass pipe with hose clamp 3094.
Repeat charge pressure check.
If the minimum charge pressure is now attained:
Replace idling stabilization valve:
=> Repair group 24; Digifant injection and ignition system; Servicing injection part
4-Cyl. injection engine (G charger), Mechanics
Digifant injection and ignition system
Servicing injection part
If the minimum charge pressure is again not attained:
Checking charge air system for leaks => Page
21-10
Checking by-pass flap adjustment:
=> Repair group 24; Digifant injection and ignition system; Servicing injection part
4-Cyl. injection engine (G charger), Mechanics
Digifant injection and ignition system
Servicing injection part
If the charge air system is free of leaks and the by-pass flap adjustment OK.:
Replace G-charger => Page
21-1
Attention!
Before replacing the G-charger, observe notes on pagewithoutfail.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
Ask about my car →Other VW procedures
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- Removing and installing parts of the charge air system – VW PG
- HM,PN,RF,EZ,EZA,PF,RH,HV,GX,PB,RP,GU,EV,RD
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
- Renewing rear roof reinforcement
- Removing and installing final drive, up to model year 2010
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
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.