Checking pressure retention valve in fuel return line: VW Jetta VI / Golf V / Jetta (BKS, BUN, CASA, CASB, …)

🧭 Before you start

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

• Renewed: pressure retention valve

Don't miss

• Clean return line connection on cylinder 1 (e.g. with commercially available cold cleaner) before removing.
• Adhere strictly to rules of cleanliness. No dirt must be allowed to get into the disconnected fuel return lines or the open connections on the injectors.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Observe safety precautions when working on diesel direct injection fuel system .Observe rules for cleanliness .Follow these instructions before starting work and while working on system. — Remove engine cover panel .
2. Remove protective strip (if fitted) .
3. Clean return line connection on cylinder 1 (e.g. with commercially available cold cleaner) before removing.
4. Dry return line connection of No. 1 cylinder.
5. Cover return line connection on No. 1 cylinder with a cloth.

6. Pull off return line connection on 1st cylinder bank by pushing connector downwards at tabs (2) and pulling up centre piece (1) to release. [Note: Adhere strictly to rules of cleanliness. No dirt must be allowed to get into the disconnected fuel return lines or the open connections on the injectors.]
7. Install pressure gaugeVAS 6330 between return line connection on injector and return line.
8. Start engine and run at idling speed.
9. Check pressure on pressure gauge.
10. Renew pressure retention valve .

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