Ive been offered a volvo 850 at a good price, the only concern i have is that the lambda sensor light is permanently on, does anyone have any experience of this problem and the possible causes? many thanks.
Duggie
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No Age, No Mileage, Nothing. You do not expect a response do you !!! ???
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Hi Peter, 1997, just over 100,000 knew id left something out! so whats the likely problem?
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Errr, the lambda sensor? Our t5 required a new one. Not too dear from places like fuelparts. whatever.
However, do check the exhaust on start up and make sure there isnt a puff of blue smoke etc.
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That means emissions problem - might not be lambda.
You can probably read the fault code - google for details.
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we have a 940 with the sensor light on all the time but it passed the exhaust gas test at its mot so nothing to worry about ,perhaps you could get an exhaust check done before you decide,should only cost you a tenner
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It's actually an engine managment warning light, so it means that one or more sensors has gone out of range, or is not working. The car may appear to run fine, but it won't be at its optimum. The fact that it's still on means it's logged a fault in the ECU, which someone with appropriate kit will be able to read. I'd get the code read (at the vendor's expense!) and make a judgement on price, including the cost of rectification, from there. You do not want to buy a 'bargain' car that then needs 00's or more spent on it to rebuild the injeciton system. The cynic in me suggests that the vendor knows what the fault is, and that is why they are selling it "at a good price"....
--
RichardW
Is it illogical? It must be Citroen....
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Volvo Lambda lights go on for any one of dozens of reasons, ranging from trivial to very very expensive.
At best, a momentary circuit blip at some time has triggered it, and clearing the On Board Diagnostic unit will simply put the light out and indicate that there is actually no underlying fault at all.
At worst it might be a failed Air Mass Meter. These cost hundreds. When they fail the car goes into a "limp home mode". It may appear to run all right, but won't be running optimally and may well fail the MOT.
There are lots of other sensors, some cheap, some less so. Sometimes the sensor itself can fail, sometimes it is telling you that some other fault has triggered the sensor.
You really need the codes to be read and then interpreted by someone who understands the implications.
At least the seller has left the bulb in place to warn you - worst case is when they suspect something wrong, but disguise it by simply removing it.
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