Thank you Joe H for the picture, it helps to understand how it works. I'll try completely undoing the jubilee clip then prising the inner sections. They didn't move last time but with the clip completely undone I might get better access. it will be a few days before I can do this as my wife needs to use the car and from experience I need to allow a good bit of time.
Hi davebb, the car has never been re-mapped or had the EGR blanked off. I did clear the codes several times but they came back again within a few seconds. I also tried disconnecting the battery for 6 hours but nothing changed. The battery is good and the low power mode when driving indicates to me that the codes are probably accurate. From the SkintKnuckles thread I think the other codes are a consequence of the 4430 EGR code.
If the 100% reading is what the ECU is asking the EGR to do, then, if it remains constant doesn't that indicate that the EGR is not responding, which can be interpreted as it being jammed?
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