My 2.0 Litre 10V 850 has covered 115,000 miles......
Friday morning I do my ususal run (40 miles) to work, all is well. About
lunchtime I had to move the car to let a colleague out the car park. So The
car ran for 5 minutes, again all was well.
On starting the car to go home at about 2pm I notice that the Lambda light
is on. The car seems to be running normally.
I drove home.... (40 miles again) Let the car cool overnight, it starts
fine..... Left the car alone on Sunday 'till about mid-day Monday. Again
it runs normally with no other sign of ill-health..... It's very cold and
damp here so the car's starting under difficult conditions. It idles well
right the way through the temperature range... Cruises happily, drives fine
in city traffic.... Did maybe 20 miles yesterday...
I have a few questions.....
1) This is a 'check engine' light yes? Which indicates the ECU found an
error on one of the sensors?
2) If an intermittant (or spurious) fault developed giving rise to a freak
error on starting, would this permanently set the lambda light on? Or would
the light clear when the error cleared (I'm thinking here the short 5 minute
run may have left unburnt fuel somewhere)
3) My car has the data connector in the centre console. I'm an electronics
engineer by training, is there a schematic for a fault code reader online or
even a device that would allow me to reset the light....
4) Assuming the light would clear itself on curing a fault, what's the most
likely cause of the lambda light coming on....
I've left the Volvo at home today; don't want to do any more damage.......
