R32 engine

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The R32 engine in my Corrado drops into limp mode. Switch the ignition off and back on and it will be OK for a bit.
Reading the fault codes, we have:
P0444 Fuel evaporation regeneration valve;
P1927 Coolant auxiliary pump relay;
B3019 EGR solenoid valve - open circuit;
All 4 O2 sensors - heater resistance too high.
Shortly before this problem I had some overheating in traffic, the rad fan was not cutting in. Renewing the sender on the rad seemed to cure this, but I noticed the car was running hotter than previously, but still well within acceptable limits.
Any help greatly appreciated.