Hi All The above vehicle came to me last July with DTC's 1806 MAF, 1815 IAT circuit and 1814 EGR circuit intermittent. The vehicle had recently had an OE MAF fitted by another garage so the EGR was replaced the codes cleared and the vehicle was fine up until now. It has now returned with DTC's 1815, 1814 and 180C? EGR position sensor. I have spoken to my Renault parts dept and they say it will have to go to them to be checked out as there is a 'procedure'. I have replaced a lot of these Renault EGR's now so has anyone got any knowledge of what the procedure is or give me any clues as to whether something else may be causing this. Many Thanks Bryan.