Checking power assisted steering pressure switch F88 — AUDI
Checking power assisted steering pressure switch F88 on Audi: 15 steps, engines ARX, ARY, AUM, AUQ. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi TT Mk1 (8N)
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- Connect vehicle diagnostic, testing and information systemVAS 5051 A and select vehicle system "“01 - Engine electronics”". The ignition must be switched on when doing so.
- Connect 121-pin adapter cableV.A.G 1598/31 (test box) to wiring harness to engine control unit, but do not connect actual engine control unit .
📐 43 workshop diagrams for ARX
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Connect vehicle diagnostic, testing and information systemVAS 5051 A and select vehicle system "“01 - Engine electronics”". The ignition must be switched on when doing so.
- From list (1), select diagnosis function "“08 - Reading measured value block”".
- Use keypad (2) to enter "“56”" for "“display group 056”" and confirm by touching Q key.
- Check display in zone (4).
- Terminate function "“08 - Reading measured value block”" by touching ← key.
- Check switch and wiring as described in the following.
- Unplug connector (arrow) at power assisted steering pressure switch F88 at power steering pump.
- Connect multimeter (resistance measuring range) to switch.
- Start engine.
- Apply full right or left steering lock.
- Replace power assisted steering pressure switch F88Running gear, front-wheel drive and four-wheel drive48.
- Check wiring.
- Connect 121-pin adapter cableV.A.G 1598/31 (test box) to wiring harness to engine control unit, but do not connect actual engine control unit .
- Check for open circuit and short to earth or positive in the following wiring:
- Repair wiring if necessary.
Ask TorqFix about your Audi ARX — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your Audi ARX — free → or sign up free to see the drawingsOther AUDI procedures
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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.