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There is a sensor on the air breather which (internally) is made up of small strips of foil and if these strips get contaminated they stick together and trigger the light to come on. This happened to my 04 1.4 Octavia and it turned out to be a leaking exhaust box (back).light was on for a week but car was running ok; after fixing exhaust it took about a week for the light to go off itself.Other cause can be the switch itself but i would not change this until everything else is eliminated (switch is expensive). Other causes can be a problem with petrol mixture or anything that will cause the engine to lose power.If a fault is found and it is not the sensor i would not consider changing sensor for a few weeks as it will probably clear itself. The light on will not cause any problem, it only tells you that there is a problem. It is also worth checking that your fuel filler cap is on properly.
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