Never noticed this before, but on my 1988 260E there's supposed to be an air temperature sensor fitted into the intake air duct just forward of where the duct joins the air cleaner. According to the service manual, this was added as a production change beginning in the 1986 model year, so it should be there. In the pic below, all that's there is a little round button cap covering the hole where the sensor should go, with no electrical wires coming off it, so it can't be a sensor. The motor runs great, but how is that possible if the ECU is not getting any signal from the ATS? I've tried removing the button cap, but it's stubborn. Anyone know how to remove it? Twist? Pry? Once off, I suppose I can fit a new ATS in the hole and find the wires buried under the air cleaner somewhere, right? Would anything else be required to bring it into spec? The service manual doesn't give much detail. TIA

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't