No further forward - potential ecu issue.
I have now replaced the aftermarket ecu with a Bosch unit as per the OEM advice kindly given above. It made no difference, with the car still refusing to start when warm. I took it to a small Volvo specialist in Doncaster (Evolve Motoring Services), whose diagnostic (not VIDA) showed up Camshaft Sensor issue, but fitting another different sensor again did not do the trick. He then checked the ECU output, and the cables from the sensor to the ECU, and all were as they should be. He suggested it must be an ECU problem as all other avenues had been exhausted. That he did all of this work but refused any payment was a surprise, but a great indication of what a top guy who is! He said he could not do anymore, but he certainly
Any recommendation re ECU checks or tests. I have contacted ECU express who will test it for £60, and repair it (if possible) for a further £70.
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