Did you get a resolution to this issue Ringa ?
Indeed - seems the Lambda sensor 4-pin connector rattled loose enough to lose comms, so RHS injector was not seeing anything coming back. Filled up with very rich-running gunk, so when moved to LHS exhaust, the problem moved too initially, but cleared thereafter. Have decided to buy 2x new Bosch sensors (which arrived yesterday), so that will be a job for the weekend hopefully. Car drove very well once problem cleared (even on the original lambda's), as it clearly liked its Italian Tune-Up at Goodwood:-)
