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98 geo metro CEL; O2-2 code 136
Topic Started: Sep 18 2017, 07:34 AM (119 Views)
fainya
Fainya
[ *  *  *  * ]
98 Geo Metro 1.3L SOHC, 5 speed.
I have had and intermittent CEL light come on.
The code is 136 rear O2 sensor low voltage.
Now the CEL lite comes on all the time.
With a new O2 sensor installed there is a yellow wire that
is for O2 sensor. Reference voltage is supposed to be 5 volts
I am only getting 2 volts. I tested with O2 sensor unplugged
at the PCM and (connector C3 pin 10) is only showing 2 volts
instead of 5 volts. I have 3 extra PCM's and I get the same reading
of 2 volt with all of the PCM's. Help please.
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freegeo
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Did you check for voltage at the connector for the O2 or at the PCM connection. Did you do all the remaining test procedures too? All other wires and connection for the rear O2 Ok?
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