Welcome to the club. I own a VW Golf 2001 with a similar problem. A 80
euro cleaning job had no effect.
The dealer says there's nothing wrong with the actual emissions. He is
earnest to tell me that he can try to replace parts but that he cannot
guarantee that this will solve the problem.
My solution: a piece of black tape over the light.
Fortunately there are still indicators for oil pressure and coolant
temperature and the car runs OK in every other aspect.

A friend of mine had the same kind of problem with his Volvo.
My sister evenually bougth a Skoda after her Peugeot 206 frequently
simply did not start and the dealer was not able to find the cause.
I also heard about these kinds of problems with a Fiat Stilo.
I think it's all about software. Microsoft is not the only one that
makes a mess of it.
Garage people do not understand what they are doing when dealing with
the motor management system. They simply follow outlined routes that are
sometimes quite irelevant.
It's time the manufacturers find a way so that the involved risks are
better spread over customers.
(I had also a 1300 euro misfortune of damaged valves due to a timebelt
problem, in spite of all prescribed maintenance.)
I noticed that e.g. Honda and Toyota owners were more statisfied, but I
am afraid that these kinds of problems are very common nowadays.
For the time being, my next car will probably a Honda or a Toyota.

not working friday night??

hello I am peugeot fan;- I am now begining to hate them as a result of
the dealers they are killing this brand and the company does not seem
to care.

I had a 1983 205GL great car never gave trouble and now I brought a
406LX (2001). few months back the dreaded engin management light came
on with the reading "Anti Polluition Fault" took in to dealer could
not diagnose but charges me in total £50 for pluging in the machine!!.
said it could be something to do with the "secondary air intake
system" Then I discoved that the exhaust has a bolw out changed the
whole system including the both the O2 sensors. Now the light comes on
and off the car runs fine???!!!??? very frustrating wonder if any one
else has had this problem I have so changed the spark plugs oil as
well. thanks

Hi

I had  a citroen picasso some time ago with a similar problem.  Garage never
solved it and it went away of it's own accord.  There is a web site which
discusses this problem in greater depth
http://www.citroenpicasso.org.uk/picasso/index.php?showtopic=14336.

Whilst it is not the same car it may have commonality of parts / design and
there is a link halfway down the page to a technical discussion document
from Citroen about lambda sensors.

Hope it hels.