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The exhaust fume light is constantly staying on, the thing is; it comes on sometimes and other times disapperas, do yuo guys know what the cause could be? A garage said it could be the fan belt, does this sound right? Any help would be appreciated.

Deep

Lamba sensor if the lights on and not flashing.

The light will come on and stay on for 14 engine starts then be back on in another 8 or so.