Hi! I'm a complete ignorant when it comes to cars. Apologies.
Have searched the forums for an answer to my problem but have yet to find one the same. Car (J reg 940s estate) has had mot and emissions are fine. Complete new exhaust fitted but since then the lambda exhaust warning sensor dash light (orange) comes on usually after only a few miles and stays on until the car is parked for an hour or so. I say "usually" as there are times when I can drive nigh on a 100 miles before it will. At the same time, the trip meter (and milometer) tend to stick after a few miles. Pushing the trip reset button in can sometimes make the lambda light flicker on and off in rhythm to my pushing the reset button in, but not always. Sometimes pushing the trip reset has no effect at all on the sensor light.
Until recently, the trip meter (originally set back at zero) would only work for 2 to 3 miles before stopping (and consequently also the milometer) but a week ago I managed on a long journey to get well over 150 miles before the trip meter stuck AND before the lambda light came on! And there was me thinking it had all cured itself!!
How can these two faults be related? Surely one is mechanical and one electronic? Unless I have some debris or somesuch that has accumulated behind the speedo panel that is causing this?
The car is parked on the road, not used much - twice a week for short journeys - and I have had condensation build up in winter months behind the glass in the area of the trip readout.
Does any of this sound familiar to anyone?
Is there a cure?
Many thanks in anticipation,
Aytch

 

Following on from my original post, I have been trawling previous "relevant" postings but to no avail for an answer.
One other problem the car (J reg 940s estate / manual box) has (which may or may not be related) is there is a rattle coming from under the car (sounds like to the rear) when going over uneven ground - sleeping policemen etc - which has never been sourced. No sign of it could be found by the fitters when raised on hoist when I had a new exhaust installed (exhaust emissions at MOT were fine).
N.B: The screw-in sensor (?) that fits into the side of the exhaust was reused when the replacement exhaust sytem was installed.
I understand there is a "speed sensor located in the differential" - where is this located and could this be the source of the trip meter problem? The speedo and trip meter will sometimes work for 10's of miles then suddenly stop for a while only to resume later. There is no pattern to the numbers upon which it stalls....so far, the trip meter has just exceed the 400 mile mark, in fits and starts.
The orange lambda sensor light on the dash still comes on after a few miles and usually will stay on till the car has been at rest for a few hours.
Sorry to be a pain.