Ben, if your vehicle is MY '05 (10th digit in VIN) it will have Bosch solenoid actuated injectors. A confirmation can be made if you lift the lid of the ECU container - Bosch ECU for Bosch injectors, Siemens for the others. A paper label on the ECU identifies its maker.

If you have a hissing noise you have a boost leak which will reduce engine output and may illuminate the MIL. The wire "horseshoe" clips on the rubber boost pipe couplings fret the aluminium ears on the hose ends, causing the joint to spring apart under conditions of high boost. Look here carefully and fit new "O" rings - they're not dear and are available over the counter from a VW dealer. New hoses are expensive - but improvisation pays...

On a general point, I wonder if VAG took a hard look at piezo injector reliability in Europe and decided not to risk it for a new (USA screwdrivered) model in the States. Remember that years ago, Audi were almost banished from the US for some design fault. More recently, in a bid by the Americans to protect their home industry, Toyota were taken to the cleaners, spun thoroughly and hung out to dry.

VW have a clear lead in small diesel technology over any of the American makers, so there is a huge amount of business at stake. It will be interesting to see if the return to a more sensible injector technology will be applied to European vehicles.

VOSA had to be kicked into asking (I suspect politely) VAG to recall the notorious Siemens PD injectors. The American Transport Authorities don't need any encouragement to kick hard an importer whose products out-perform those of their home vehicle producers.

659.

The AdBlue enables DPF regeneration to be accomplished at a lower exhaust gas temperature, allowing a simplification of VAG's current CR regeneration system. The fluid is readily available in the US.

Edited by 659FBE on 02/11/2011 at 18:00