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Totally agree with Elecki& ACdoc
The only way to test diesel injectors is either off the car in an injector rig and these can often cost in excess of 90K or by carrying out current consumption draw on an ossilliscope and using a fuel line pressure transducer.
Most of the above is above the average garage.
I also must add these injectors do sieze or ( carbon into the cylinder head and can be a nightmare to remove )
Fault code reading for diagnostics is a total misconseption these days and it gets frustrating when both main dealers and many garages either replace parts because a fault code has flagged or the computer says no. this method applied some years ago when diagnostics were simple but these days a full diagnostic check and test procedure should be carried out to achieve a first time fix.
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