Oxygen sensor earths? - Information required #Archived Message
Posted by Phil Dunmore on April 14, 2007, 9:55 pm
More a theory question than a specific fault as I know the case and have rectified problem. A 1995 Skoda Felicia came in with rotten front pipe. O2 threads corroded & stripped so new sensor also needed. Vehicle specific not available quickly so fitted universal. Ran very poorly, gas test showed very lean. Quick resitance test showed Grey earth wire on original sensor had continuty to sensor mounting, universal did not. Spliced an earth lead to nearby earth point, problem solved.
Was the universal at fault? If so why bother with the grey wire, three wire type must work this way. Puzzled