toxic fumes warning light??

[1sam23]

my toxic fume monitoring warning light has just come on for no apparent reason anyone have any idea at what might be causing this? Cheers

 

[syko6288]

Faulty lambda sensor

 

[Munson]

Mine did this at least twice a year for 5 years.

 

[vibez666]

Mine came on yesterday for no reason at all, cars running fine though, It was slinging it down with rain so i'm putting it down to that lol!! Goes in for MOT in a couple of weeks, so I'm sure they will let me no if anything is wrong by giving it a big fat FAIL!!