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I'm stuck with o2 sensor/ check engine light 200 1989

posted by  Mark Lundell on  Tue Sep 7 13:31 CST 2004
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last visit: Sun Sep 14 21:34 CST 2014
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My '90 240 was running very poorly. Gas millage dropped dramatically in a short time period. Codes said signal missing from O2 sensor. I just replaced it with a bosch 13913 3 wire (for a ford mustang). It runs a bit better, but then check engine light came back on again. Codes are now 1-1-3 - injector fault, 2-3-1 O2 sensor is not operating, and 2-2-1 O2 sensor not operating. When I check the voltage from the sensor it reads 1.8 volts to 2.0 volts. Can this be right or did I measure it wrong?








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    I'm stuck with o2 sensor/ check engine light 200 1989

    posted by  someone claiming to be 240snowmobile on  Wed Sep 8 05:01 CST 2004 [RELATED]

    That reading is wrong. A working sensor should toggle between 0.1 and 0.9 volts. Steady readings greater than 0.45 indicate rich mixture; less than 0.45 is lean. Your readings are off the scale; make sure you are not measuring the heater wires by mistake, or using a 2x scale on your meter.

    The important thing is the sensor should swing back and forth between rich and lean as the ECU constantly adjusts the mixture and tries to hold the engine as close to the ideal 0.45V as possible. The swing should happen about every 0.5 to 2 seconds.







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    I'm stuck with o2 sensor/ check engine light 200 1989

    posted by  someone claiming to be Another240Guy on  Wed Sep 8 04:41 CST 2004 [RELATED]

    Did you reset the ecu after you replace the senzor?, check your #4 fuse that supply voltage to the 02 senzor, I've similar problem few months back because the blown fuse, good luck.
    Tom







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