Checking needle lift sender G80: Audi 2.5 TDI (ACV, AFB, AHY, AJT, …)
Step-by-step checking needle lift sender G80 for the Audi 2.5 TDI: 10 steps. 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: platform codes 70A, 70B, 70C, 70E, 70H, 70J, 70K, 70L, 70M, 7DA, 7DB, 7DC, 7DE, 7DH, 7DJ, 7DK, 7DL, 7DM
- Renewed: injector for cylinder no
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- If necessary, left headlight may have to be released and placed to side to connect test boxV.A.G 1598/31Electrical system; Rep. Gr. 94; Lights, bulbs, switches - exterior.
📋 Procedure
- Switch off ignition.
- Disconnect connector for needle lift sender (1).
- Measure resistance between connector contacts. Specification: 80…120 Ω
- Replace injector for cylinder no. 5 with needle lift sender G80.
- Measure resistance between connector contacts. Specification: 95…115 Ω
- Replace injector for cylinder no. 4 with needle lift sender G80.
- Connect test boxV.A.G 1598/31 to control unit wiring harness. [Note: If necessary, left headlight may have to be released and placed to side to connect test boxV.A.G 1598/31Electrical system; Rep. Gr. 94; Lights, bulbs, switches - exterior.]
- Check lines/wiring between test boxV.A.G 1598/31 and connector for open circuit referring to current flow diagram. Contact 1+socket 109 Contact 2+socket 101 Line resistance: Max. 1.5 Ω
- Also check wiring for short to one another, short to vehicle earth and short to battery positive. Specification: ∞ Ω
- Renew diesel direct injection system control unit J248.
Other AUDI procedures
- Dismantling and assembling pistons and conrods
- Checking signals from/to air conditioning system
- Removing, installing and tensioning injection pump toothed belt (engine codes ACV, AHY, AJT, AUF, AXG, AXL, AYC, AYY)
- Removing and installing exhaust turbocharger
- Checking injection timing control range – Audi A4 B5 2.5 TDI
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
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.