I know this subject comes up from time to time,my light came on my 57 plates mk5 gti 32000 miles fvwsh,owned since new and treated like a princess.Iv read a few older threads and turned the fuel cap, no difference.I checked the oil on saturday and the dip stick seemed brittle and some of it fell away from around where it goes into the engine still fits ok but not as snugg. Could this put the light on?Iv just ordrerd a new one just in case.Thanks for any feedback......