Checking for injectors sticking open: VW Jetta VI / Golf V / Jetta 2.0 TDI (CFFA, CFFB, CFFE, CFGB, …)

🧭 Before you start

Fits: VW Jetta VI (16, 2010–2018), VW Golf V / Jetta (1K, 2003–2009); platform code AJ5

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• Make sure all parts are clean; no dirt must be allowed to enter the fuel system.Check all cylinders in turn.
• Tighten union nuts on high-pressure lines hand-tight. Ensure that connections are not under tension.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Always read rules for cleanliness and instructions for working on fuel system .Always follow these rules for cleanliness and instructions before starting work and while working on the fuel system. — Erase fault memory entry with vehicle diagnosis tester.
2. Remove engine cover panel .
3. Clean all connections (e.g. with commercial cleaning solution) before removing. [Note: Make sure all parts are clean; no dirt must be allowed to enter the fuel system.Check all cylinders in turn.]
4. Dry all components after cleaning.
5. Unscrew union nut at fuel rail No. 1 cylinder, and also loosen union nut on injector slightly. Seal off open connection on injector line.

6. Seal off open connection using plug T40204.
7. Erase all fault memory entries.
8. Carry out a road test. [Note: The fault memory entry "“positive regulation deviation”" must not be stored when the correct injector has been located.Other fault messages may possibly be stored in the memory. These new fault memory entries can be disregarded (follow-on faults).]
9. Read fault memory after road testing vehicle. If a fault relating to "“positive regulation deviation”" is still being indicated, repeat the above steps for all connections until the fault is no longer indicated after the road test.
10. Lubricate threads of union nuts with fuel.
11. Tighten union nuts on high-pressure lines hand-tight. Ensure that connections are not under tension.
12. Install high-pressure lines .

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