Removing and installing electrical wiring harness for unit injectors — AUDI

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

Don't miss

• If the wiring harness breaks when pulling it out, make sure that no fragments of the wiring harness get into the engine.

🔧 Engine codes this applies to

📋 Procedure

1. Pull cover off air duct (release clips on sides) (arrows).
2. Unclip air duct at the bottom by releasing clips (arrows).
3. Detach air duct (bottom) together with air hose.
4. Unplug electrical connector (1) at air mass meter G70.
5. Detach vent hose (3) and air hose (2).

6. Unscrew bolt (4) and remove air cleaner housing.
7. Remove cylinder head cover 15.
8. To unplug electrical multi-pin connector for unit injectors and glow plugs, pull release pin (arrow 1) and slacken knurled nut (arrow 2).
9. Pry off connector from the unit injector using a screwdriver (arrow). Press gently against the other side of connector with finger to prevent it from tilting.
10. Unbolt multi-pin connector from cylinder head and press it out of hole on cylinder head.
11. Push wiring harness out of guides (arrow) and remove retaining clips. [Note: If the wiring harness breaks when pulling it out, make sure that no fragments of the wiring harness get into the engine.]
12. Pull retaining clips (2) off new wiring harness.
13. Insert connectors (1) into assembly guides to facilitate installation of wiring harness.
14. Working from the bottom right side, slide wiring harness (2) into hole on cylinder head (arrow).
15. Attach retaining clips and move wiring harness into installation position.
16. Tighten bolts on multi-pin connector.
17. Attach electrical connectors for unit injectors.
18. Install cylinder head cover 15.

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