Technical Fuel injectors

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Technical Fuel injectors

Tapping/pssstting noise from top of engine near injectors also little smoke puffing out?...New ones needed or new washer/o ring?
 
Or I'll explain symptoms and if anyone thinks it's something completely different then advice would be much appreciated. Again tapping/pssstting noise coming from top of engine around oil filling point and while driving after a while oil light will come on and stop light? Also mid display warns oil pressure too low?
 
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