Some info I've just come across.
... This is a brief précis of the VW UK Service Action 23H9 regarding Piezo pump injectors.
The repair instructions are contained in Technical Product Information (TPI) transaction number 2027647
This applies to 2.0TDI PD Golf, Passat, and Touran with PD Piezo Injectors
There are approximately 78,800 (model years 2006 – 2010) affected vehicles in the UK.
Owners will receive communications from Volkswagen UK on a phased basis.
The following vehicles with the engine codes listed are affected.
Passat 3C 2006-2008 with the BKP, BMA, BWV, BVE, BKP, BVE, BMA, BWV, BMR, and BUZ engines
Golf 5 2006-2009 with the BMN engine
Touran 2006-2010 with the BMN engine
Technical background
On some vehicles with the 2.0l TDI engine, deposits can settle on the Piezo pump injector elements because of dirty engine oil. This can lead to running problems. Not all vehicles are affected by this campaign! On the affected vehicles the Piezo pump injector elements must be checked and if necessary replaced. Please make sure that on the affected vehicle the check and repair of all open campaigns/measures are performed during the workshop visit.
Parts to be fitted as part of this campaign.
1x Campaign 23H9 sticker 000 010 006 1x Wiring loom adapter 03G 971 033 M 4x Adjustment screw WHT 000 530 5x M8x58 socket head bolt N 105 811 01 8x M6x88 socket head bolt 03G 103 385 A 4x Pump injectors
If the vehicle is listed in the system as not completed, check whether a campaign sticker with the entry "23H9 date/stamp" is attached in the spare wheel well area (next to data sticker):If the campaign sticker is attached, the campaign has already been performed. Make the entry “23H9 date/stamp” in the service schedule under “Space for workshop entries”.
If the campaign sticker with entry "23H9" is not fitted, carry out the work according to the repair instructions.
Identifying the potentially faulty injectors.
Remove cam cover and check the part number –see arrow- on the pump injector element. All pump injector elements with the part number 03G 130 073 D or 03G 130 073 M must be replaced. All other pump injector elements are correct and must not be replaced.
The source ------>
http://www.vwaudiforum.co.uk/forum/showthread.php?121679-Injector-Failures-Possible-recall%2Fpage53