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I thought that you had . . .
done a pin mapping of X11/4 and that's why you said your car had CF (pin 21). So I quess you hadn't.
See my page, MENU#4 re Lambda testing. I have the M0039 meter and use it measure the car's lambda. But you can accomplish this testing with any meter that has duty cycle. Others have used a Fluke meter: do a search and you'll find alot of info on it.
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Regards . . . . JimF
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'94 S500 Cpe
Visit my Mercedes Web Page
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