Just been trying to tune but gave up. The wideband reading was all over the place flashing from 12 to 80 and back. even at idle it changes. Tried on two cars and the same. Recalibrated but still the same. Any ideas? Bad sensor?

 

Sorry should have put, its the LM1 with a boshh sensor. Its taking longer to heat up (i think) but no theres no rattle. In free air it will read 20.9 o2 steady, its strange. It was doing it the other day in mine so tried it today im my mates evo and a cruising its was reading anywhere between 30 and 50.
I wondered if it could be the lead as i often route it through the boot but there is no visible damage/kinks.