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Oxygen Sensor '84 240 DL B23F 138,000[850/1995] posted by Tony on
Sunday, 29 March 1998, at 7:17 a.m.
My car has been running rough. Using the Bentley manual I found my O2 sensor was putting out on .001 volts; not the .6 volts as
advertised. I checked a friends car and found he was putting out the .6 volts. So it seemed to me my problem was the O2 sensor.
Got one & put it in. The old one was a bear to remove. Tried to start the car & it wouldn't. Found out I had lost the +12 volts
to both the coil & my Chrysler ignition unit. So after tracing it back I found a connector with 2 wires tie wrapped by the
windshield motor. Blue wire in had 12 volts, brown & blue coming out had zilch. I clean the connector and power was restored
However, my new O2 sensor is putting out the same .001 volts. I tried different grounds w/o success & even used the O2 shield as a
ground. Anybody got any suggestions/recommendations? I also found my car uses a 3 wire O2 sensor & not the single wire listed for
'84s.
Re: Oxygen Sensor '84 240 DL B23F 138,000[850/1995] posted by Ozzie France on
Monday, 30 March 1998, at 8:46 a.m.
I have an 84' 240 DL with 180K,
Mine has a single wire O2 sensor, I agree it was a pain to remove, when I tested mine I got a bad reading, but after I changed the sensor the driving conditions weren't any better. I don't have a chrysler distributer either, I wonder what the person before you did to the car?
Ozzie
84' 240 DL 180k
68' 142S 150k
Re: Oxygen Sensor '84 240 DL B23F 138,000[850/1995] posted by Mark Klein on
Monday, 30 March 1998, at 8:17 p.m.
The O2 sensor is an input to the computer. If it senses a lean condition, this will make the sensor register a low voltage. The .5 volt is a reference signal from the control unit. You should get this signal at the green wire end even if the O2 sensor is disconnected. With the O2 sensor connected and the car at operating temp and running, you should have a fluctuating voltage of anywhere from .2v to .8v if everything is normal. If there is a large vacuum leak, you will get a low voltage. If it were rich, you would get a much higher voltage.