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[magnul]

On my way to work this morning the EML lit and the car was running like sh*t. Paperclip told me "26 Injector valve 2 Voltage high".

Do injectors ever fail, or is it more likely that there's an open circuit somewhere?

[Marks DTM Calib]

More likely to be the wiring, check the wires in the engine wiring loom tray

[magnul]

Will do during lunch hours. The loom is a bit of a mess because of the piggyback system between injectors and loom tray (car running on ethanol). Chances are that I upset something the other day when cleaning out the breather jet.
Will also check that the injector resistance is in the 14-16ohm area.

[Matchless]

Have a good look at the multiplug for the injectors, the wires break close to the plug.
The last one I repaired broke so close to the connector that there was no room for heatshrink so I soldered the joint and then used a wrap of selotape as a mould and filled it with araldite to stop any others breaking.

[magnul]

Solved. One loose connector from the piggyback system.

[Entwood]

Nice one .. easy fixes are always the best (and cheapest!!)