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Checking modulating piston movement sender G149: Audi 2.5 TDI (AGX, AHD, ANJ, APA, …)

Step-by-step checking modulating piston movement sender G149 for the Audi 2.5 TDI: 15 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.

15 steps 7 engine codes

🧭 Before you start

Fits: platform codes 2DA, 2DB, 2DC, 2DD, 2DE, 2DF, 2DG, 2DH, 2DK, 2DL, 2DM

  • Renewed: injection pump

🔧 Engine codes this applies to

AGXAHDANJAPAAVRBBEBBF

📐 21 workshop diagrams for AGX

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

Checking modulating piston movement sender G149 — AGX · diagram 1
Checking modulating piston movement sender G149 — AGX · diagram 2
Checking modulating piston movement sender G149 — AGX · diagram 3
Checking modulating piston movement sender G149 — AGX · diagram 4
Checking modulating piston movement sender G149 — AGX · diagram 5
Checking modulating piston movement sender G149 — AGX · diagram 6
Checking modulating piston movement sender G149 — AGX · diagram 7
Checking modulating piston movement sender G149 — AGX · diagram 8
+ 13 more diagrams
🔒 21 workshop diagrams for this job Ask about your Audi AGX — free or sign up free to see the drawings

📋 Procedure

  1. Press key ← twice.
  2. Press function "“06-End output”".
  3. Switch off ignition.
  4. Disconnect connector for injection pump.
  5. Measure resistance between connector contacts 1+2 and 2+3 (1). Specification: 5...7 Ω.
AGX? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Renew injection pump .
  2. Connect test boxV.A.G 1598/18 to control unit wiring harness .
  3. Check wiring between test box and connector (1) for open circuit referring to current flow diagram. Cable resistance: max. 1.5 Ω.
  4. Additionally check wires for short to one another, to vehicle earth and to battery positive. Specification: ∞ Ω.
  5. Measure resistance between connector contacts 1+2 and 2+3 (1). Specification: 5...7 Ω.
  6. Renew injection pump .
  7. Connect test box to control unit wiring harness .
  8. Check wiring between test box and connector (1) for open circuit referring to current flow diagram. Cable resistance: max. 1.5 Ω.
  9. Additionally check wires for short to one another, to vehicle earth and to battery positive. Specification: ∞ Ω.
  10. Renew diesel direct injection system control unit J248.
Workshop diagrams

Ask TorqFix about your Audi AGX — 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 AGX — free → or sign up free to see the drawings

Other AUDI 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.