I have had a somewhat similar incident occur where GP light stayed on after starting ... then finally went out. Waited about two weeks and it went away ...

Am wondering if checking connections on GPs, on battery ground etc might help ... at least it is very, very cheap.

Let us know what happened.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg