And the EGR, Injector timing, MAF, Boost sensor, The fuel quantity solenoid in the pump, Security and AC clutch.

Is the right answer. BUT, you can take it all off, with a fair bit of work, if it starts to give trouble - usually parts availability, which is usually the needle lift sensor in number four injector (ERR3337), which goes open circuit, puts the check engine light on, and... instant MOT failure!

IIRC Bosch stopped making said injector 8 years ago.
 

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