Lambda Sensors and Cat Convertors Explained.

[Frank]

Good general overview -

http://www.lambdapower.co.uk/TechNotes/Tech-1.asp" onclick="window.open(this.href);return false;

Good diagnostic FAQ -

http://www.lambdapower.co.uk/Diagnosis/Diagnostic_index.asp" onclick="window.open(this.href);return false;

(seemed pretty balanced and not the usual 'It's shot, buy a new one from us' stuff that you might expect)