Problem with Lambda (O2) sensors is that they don't just suddenly go defective . they degrade over time ..
Kinda like spark plugs.. these cars are getting old and if the lambda is over 60k and the fuel consumption is high I'd certainly check it.. either with diagnostics or the good old fashioned voltmeter method.
Autolosso sell the real deal for about 70 quid.. don't p**5 about with an e bay universal one..
They are supposed to have an output voltage swinging between 0.1 volt and 0.9 volt..
a completely duff one will will have a fixed voltage.. usually low.. or zero..
a semi knackered, old, on it's last legs one.. will swing between 0.1 and say 4 or 5 volts.. (this can pass diagnostics). so look at the graph..
A low voltage output means it's telling lies to the the ECU.. in that the engine is running lean.. ECU then richen's up the mixture to compensate.. therefore high fuel consumption.
check all the usual's as well .. filter.. stat.. flints.. etc..
Gettin' to old for this sh*t
Last edited by seadart; 14-02-14 at 11:11.