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  #1  
Old 01-22-2003, 01:19 PM
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1984 190e O2 sensor light

Ive heard that my model car has 2 oxygen sensors, is this true? Also the Oxygen sensor warning light on the dash is lit up, I assume that means I need to replace the sensor right? I was able to locate one sensor underneath the car on the exhaust pipe just to the rear of the front wheels, is that the one that needs replacing? I looked up the sensor price and its about $115, Im willing to try the ford mustang one that supposedly works but which mustang is the sensor from?.

Thanks ahead of time for any and all help on this one
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1984
190e 2.3L
107000 miles
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  #2  
Old 01-22-2003, 03:55 PM
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How many miles on your '84? The O2 light is supposed to come on around 60K, which MB estimated the life of the sensor. You can use the Bosch Mustang 5.0 sensor and save quite a bit. I believe the '84 only had one sensor. Be advised that MB did not provided a "reset" switch for the '84 - '86 sensor light, so unless you like that red glow, you have to remove the bulb from the instrument cluster, which generally requires pulling the cluster.
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Old 01-22-2003, 03:59 PM
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I'm sorry, I didn't look at your sig. You obviously got 30K more miles on the sensor timer! Another source for the sensor is www.oxygensensors.com. Nice website, plus they sell the whole kit with the anti-seize compound, heat shrink tubes and some instructions for $40, which includes USPS shipping.
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Old 01-22-2003, 10:47 PM
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The bulb was missing an through the course of me replacing non working dasl bulbs I replaced it and found that its glowing, would clearing the computer reset the light?
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Old 01-23-2003, 01:56 AM
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I don't think so, I've had the battery disconnected while working on other parts of the car and the light is still there. The MB service manual is the source of the instruction to remove the bulb, so I have to assume that they didn't design a reset mode.
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Old 01-23-2003, 01:08 PM
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do you know about the circuit that activates the O2 sensor light?, could it possibly be triggered inside the odometer at a set milage thing or by an out of acceptable value O2 sensor reading tripping a circuit and lighting the warning light
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Old 01-23-2003, 03:02 PM
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When I had my instrument cluster out, I noticed that the O2 sensor light holder was hard wired via a green wire to a connector that seemed to be behind the speedo/odometer. It was the only bulb in the cluster that was wired that way. That would suggest that there's a switch or circuit in the odometer of our vintage cars that sets off the light regardless of the sensor's performance. If the sensor does fail, you would notice decreased fuel efficiency and perhaps some acceleration problems since the sensor is basically telling the fuel system to run rich.
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Old 01-23-2003, 04:16 PM
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Ive got a good amount of throttle lag and low acceleration in my car, I get about 21 miles per gallon from a mix of light highway and suburban driving, does that seem low to you?
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Old 01-23-2003, 05:53 PM
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The MPG does not seem particularly bad, anything in the 20's for average is about right. My '85 has slightly higher compression than your '84 and I'm averaging 22 MPG. I would think that changing out the sensor should help some. I would also suggest running a few tanks of fuel with an injector cleaner, like Chevrons Techron or Redline's cleaner and see if you get more out of the 2.3.
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Old 01-23-2003, 08:07 PM
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I pulled the dash cluster out today to see if i could figure out the O2 sensor light activation mechanism. I figured out how it is activated and how to RESET it. I followed the green wire from the light to the odometer where it connects onto a circuit board. I will have pics of exactly what I am describing within a day and will gladly share them
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Old 01-23-2003, 09:01 PM
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Yankee ingenuity prevails over the white coat boys in Stuttgart! I'd like to see what you found.
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  #12  
Old 01-24-2003, 12:10 PM
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Here is the pic of the side ofthe odometer where the greem wire goes with the O2 sensor light in the on position
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1984 190e O2 sensor light-o2-lit.jpg  
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  #13  
Old 01-24-2003, 12:11 PM
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Here is what needs to be moved onto the wheel looking thing to reset the light. Its indicated by the red pointer, the wheel is to the left of the pointer
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1984 190e O2 sensor light-what-reset.jpg  
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  #14  
Old 01-24-2003, 12:19 PM
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here is the odometer with the O2 sensor activation reset to the off position the part that is circled is what needed to be pushed in the direction of the arrow then lifted upwards and placed onto the wheel so it is supported
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1984 190e O2 sensor light-o2-reset-1.jpg  
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  #15  
Old 01-24-2003, 12:26 PM
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from what I gather from looking at this the O2 sensor light is activated at a set interval of milage regardless of wether or not it actually needs to be replaced though from my estimation the light comes on somewhere around 60,000-70,000 miles and should cause the owner to bring the car to a dealer for service, where the sensor would be replaced and the light reset via cluster removal all at quite an expense to the owner. The lowest Ive found a direct replacement for the sensor was about 115 dollars this not including diagnostic and labor time and charges that would be incurred at a shop
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