Hi people i'm looking for some help please! i have a 2001 astra sxi. it is doing around 20 mpg when knocking around, surely this is not right?!
I have tried a full service, new therostat which was needed as it was stuck open, i also removed throttle body and thourghly cleaned. none of these have made any difference.
Could this have anything at all to do with the lamda (or oxygen) sensors. when i monitor them with opcom the 1st sensor is permanently changing voltages very quickly (from 50mv to 900mv) but the 2nd sensor more or less stays the same. is this right?
I am left scratching my head here really haven't got a clue but surely this low mpg is not right is it?