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MTI · 06-21-2005, 04:48 PM

If you check the Mercedes Service Manual, I believe you'll see that the recommend procedure is to remove the bulb. The sensor light is activated by a trip cog in the odometer, not any diagnostic circuit in the Bosch CIS system. There is no "reset" circuit. A year or so after 1985, the cars were fitted with a relay that had the reset button.

06-21-2005, 04:48 PM	#2 (permalink)
MTI BenzWorld Elite Date registered: Aug 2002 Vehicle: '85 2.3-16 '99 C280 Location: Honolulu, Hawaii, USA Posts: 2,533	RE: 1985 380se oxygen sensor light If you check the Mercedes Service Manual, I believe you'll see that the recommend procedure is to remove the bulb. The sensor light is activated by a trip cog in the odometer, not any diagnostic circuit in the Bosch CIS system. There is no "reset" circuit. A year or so after 1985, the cars were fitted with a relay that had the reset button.