I live in boston, links, pe21 postcode. Ecu is magneti marelli, it says 600 sporting 1.1plus a whole load of other numbers on it. Mpi of course.

Ok, pre cat and post cat sensors. THESe are a new one on me. I guess they just screw out? Any experience of probs encountered would be appreciated.

Normal rules said:

I live in boston, links, pe21 postcode. Ecu is magneti marelli, it says 600 sporting 1.1plus a whole load of other numbers on it. Mpi of course.

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The sensors will need a tap on a spanner to get them to unscrew no doubt.
It sounds like the non-MF59 one and those Ecu's are pretty reliable. The MF59 type suffered from corrosion on the aluminium heat sink and some of the internal earth connections became high resistance.

Swapped the cat sensors over.

No change whatsoever.

Would a proper garage type diagnostic check help. I have a ten quid obd2 reader which dos not throw up any codes.

Normal rules said:

Would a proper garage type diagnostic check help. I have a ten quid obd2 reader which dos not throw up any codes.

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MultiEcuScan shows the parameters/readings of things but is not cheap for the full setup. A garage would normally have the diagnostic equipment to read things but It's down to the person to interpret the readings to find a problem.