Fitted new lambda sensor, also after Nigel Cowies advice on ECT switch tested this unit. We found that this it performed reasonably under cold conditions but dropped right out of recommended resistance reading when hot. So now she boasts a new one of these as well! Dont know if we have a further problem in the pipeline as No one cylinder reference sensor code still flags up in code reader, but does not even after 20 mile drive light EML, any thoughts? Thanks for all help! Phrom fill