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just-n-time 11-12-2012 04:37 PM
Oxygen sensor voltage
 
In testing my heated ox today I turned on the key and when I tested the voltage at the green wire it started out at 11.5 and steadily dropped to around 1.3, why. 1990 190E California car. :mad:

porkface 11-13-2012 05:39 PM
sounds like the heater circuit is shorted with the sensor wire. replace the o2 sensor. good luck, chuck.

just-n-time 11-13-2012 07:16 PM
ox voltage
 
Quote:
Originally Posted by porkface (Post 3048942)
sounds like the heater circuit is shorted with the sensor wire. replace the o2 sensor. good luck, chuck.
the wire to the heated section is what i was refering to. thats the wire from the car to the ox. i wonder if it goes threw a fuse or a relay.


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