What's causing my Peugeot 206 to misfire?

My 2003 Peugeot 206 1.4 diesel has developed a misfire. I took it to my local garage, but they have not been able to find any fault as the diagnostics machine was unable to establish a connection. Do you know what could be causing the misfire?

Asked on 22 November 2016 by Claire

Answered by Honest John
2nd report today. Three problem areas with this engine are injectors, injector seals and the Electronic Accelerator Module.
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Not bad looking. Economical 1.4 diesel gets under 119g/km.
 

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