If it comes on all the time, no big deal, just the sensor.
However If it only comes on at speed, get back to us with the milage and how much oil its consuming.

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."