It helps the system adjust the 'fuel trim' - i.e not running too rich or lean - driving without would c o c k this up & your emissions will be sky-high & economy would be down
My efficiency improved once I fitted a new one
I didn't notice any drop in fuel efficiency in the last week, but it does sound like it's definitely something I need to get done as soon as possible.
I am wondering did the sensor just start malfunctioning since the MCSF light came on, or is it possible that it wasn't working fully before then?
My fuel efficiency has really been quite low (25mpg or so), and it would be interesting to see if this made any difference.
I would say 25MPG is pretty low - Lambda would gradually fail & IMHO the fault may not be recorded immediately - only until a cetain 'threshhold' is reached - BTW, don't take my word as 'gospel' - there's guys here with much more knowledge than me
and I was just wondering what it does? What happens if I drive without it (as I have done for the last week or so). Should I get any better fuel efficiency/ performance with a new one?
It is there to measure oxygen in the exhaust and adjust the mixture to suit. If it's the wrong type or faulty it could run rich, hence low MPG, or lean, which over a long time could damage the valves.
My 2.0 is currently fitted with the NTK (I have a Bosch unit to replace it when I can get the old one out!), and since fitting it is has constantly caused a couple of fault codes to appear but never caused the management light to come on.
HIS: 1998 156 2.0 TSpark with Sport Pack 2, sunroof and hi-level spoiler in Alfa Rosso. V6 intake mod, clear side repeaters and Zeatek undertray.
HERS: 2009 MiTo 1.4 95bhp Turismo arrived 21st November in Techno Grey with colour-coded headlight surrounds.