Newby back again, having had engine warning lights on recently & scanner checks indicating CAT underperforming I tried ‘Cataclean’ which worked for 3 days. Before that a tank full of 99 RON petrol seemed to extinguish the little engine warning light for a few days too. Had the engine carbon cleaned for twice the normal time (60 mins) today & the minute I drove away, vibrating steering wheel & new warning lights not seen before (as in title). I have seen comments like "sensors need re-calibrating" to "replacement oxygen sensors" elsewhere which I hope leads to sensors & not CATS as I have been quoted nearly £1200 for OEM parts.
BTW The engine can hardly be heard now, smoother shifting and power delivery, probably quicker too & they claim up to 4 MPG improvement as well so for £100 a good investment despite current situation, especially as mine has done nearly 195,000 miles.
Merry Christmas