Solenoid injector failure on VAG PD engines is very rare as long as the fuel system has been properly maintained. Look very carefully at the service record to see how frequently the fuel filter has been changed and also look to see what make of filter is presently fitted. Try to assess the likelihood of substandard or contaminated fuel usage.
Under average UK conditions with "high street" fuel I would recommend changing the filter for a German made component every 30k miles. This allows a fair margin of safety as most retail fuel now sold is very clean.
If there is any evidence of poor fuel system management, the probability of further injector problems is high. If the maintenance has been good, these engines will often do in excess of 300k miles on the original injectors. Impending trouble can often be detected with VAGCOM which will show injector imbalance - these engines have software correction of injection quantity to give equal crank acceleration between firing strokes.
Diesel engines are intolerant of poor maintenance.
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