I recently had a P2187 (System lean to idle bank 1) cell on my Mazda Speed3 (2006). After some research I changed the purge solenoid valve which seems to clear the fault. About a week later the check engine light came on again this time with a P0401 (EGR flow insufficient). The second light came on just as my fuel light came on, could this be linked? I have seen a number of threads suggesting that the P0410 can be fixed by removing and cleaning the EGR valve and tube. I have also seen people suggesting it could be either the valve position sensor of the temperature sensor?

Does anyone know of a way to check this before I put the valve apart?

Also is there a link between the P2187 fault and the P0401 or is it just bad luck?

Cheers