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Oxygen Sensors: difference between pre 93 and later??

posted by  dick on  Wed Oct 2 08:21 CST 2002
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last visit: Sun Aug 3 15:24 CST 2014
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Have noted that applications are different and more expensive for the later B 230FT engines. Sometime back I replaced the O2 sensor on my 93 and I do believe it just doesn't run properly since. I used a generic Bosch which I never have had problems with in 91 and earlier models. Is there a different voltage produced which influences the 'brain'?

Can someone enlighten this dim witt or watt??

Thanks,

dick
--
93-940T + 91-940SE + 87-740GLE = One Happy Volvo Garage!








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    Oxygen Sensors: difference between pre 93 and later??

    posted by  someone claiming to be Frank on  Wed Oct 2 09:22 CST 2002 [RELATED]

    In March of 1993 volvo switched from a three wire O2 sensor to a four wire sensor. I have a 1993 940 turbo and I just recently changed the sensor. Given the different wire configurations, you would not be able to install the wrong sensor because the wiring would not match up. There is one issue with generic sensors. You have to be careful of corrosion where you splice the new wires to the old.








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      Oxygen Sensors: difference between pre 93 and later??

      posted by  dick on  Wed Oct 2 14:07 CST 2002
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      last visit: Sun Aug 3 15:24 CST 2014
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      Mine was mfr'g in January and has a 3 wire unit. Wonder what that 4th wire does.

      Thanks,

      dick







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