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#1
04-17-2004, 09:15 PM
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Need to reset O2 sensor dash light
Just replaced my O2 sensor, but I do not know how to reset the
dash light. Searched previous posts and could only find reference to disconnecting battery. Tried it - did not work. '93 190e 2.3 Can anyone help me out? 
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1993 190e 2.3 Spruce Green Metallic 62k original 
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#2
04-17-2004, 09:55 PM
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Could be that the dash light is indicating another problem. Is yours a model with a button and LED in a (X11) connector along the firewall? If so, set the key to #2 position (just before the starter engages), press the button for 2 seconds, then count flashes. Press the button for another 2 seconds and check for other codes. The codes will repeat in ascending sequence.
Sixto 95 S420 87 300SDL
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#3
04-17-2004, 10:32 PM
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Sixto-
Thanks for responding- I believe that I found the test connection (X11/4 - impulse readout, 8-pole). Am I correct? Held button in for 2 seconds and received 1 flash. LED was on when I turned key to #2 position. After I held it in for 2 seconds, it did go out and then the 1 flash. If I press the button again - the LED stays on. -John
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1993 190e 2.3 Spruce Green Metallic 62k original
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#4
04-18-2004, 02:05 AM
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That goes beyond what I know of the early OBD. I'm pretty sure the light should never stay on and shouldn't come on until you hold the button for two seconds. I believe one flash means the ECU is fine.
Try getting Steve B or Donnie in on the thread. Sixto 95 S420 87 300SDL
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#5
04-18-2004, 04:16 AM
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On the later model W201's there's a reset button located under the carpet on the passenger side. Have a look for a square box with a button on the top. Hold the button for at least 2 seconds. The light will only go out after the engine is started.
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#6
04-18-2004, 09:12 AM
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I just did the O2 sensor on my w202 yesterday, and to clear the CE light I just disconnected the battery. Will that work on your 201?
Jonathan
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#7
04-18-2004, 10:29 AM
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Checked under the carpet on passenger side. Can only locate the cruise control amplifier, SRS voltage converter, anti-theft alarm control and X11/13 which is the SRS test connection.
No box with a button. I disconnected the battery again but no luck. The red LED does go on (X11/4) every time I turn the key to the #2 position. If I press the button for 2 seconds it will go out, but will light up again when the key is turned to #2 position.
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1993 190e 2.3 Spruce Green Metallic 62k original
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