Are these serviceable items or do you wait for them to fail prior to replacing?

Injectors are certainly serviceable items. Any that have done 80 to 100,000 miles will be a bit tired. New nozzle and needle and calibration is around £30.00 or so a piece. Suppose you could change glow plugs every couple of years for what it costs. .
 
Fully new is a small fortune £140 ish per injector (varies considerably)
 
Injectors are certainly serviceable items. Any that have done 80 to 100,000 miles will be a bit tired. New nozzle and needle and calibration is around £30.00 or so a piece. Suppose you could change glow plugs every couple of years for what it costs.

Can anyone recommend someone to test and calibrate injectors near West Sussex/Hampshire border area?
 
Have a look online for a Bosch diesel center there's one near us and they recon injectors but I'm unsure of the price.
 

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