Smog problem - Should this vehicle have an O2 sensor ? 1985 Subaru GL wagon 1.8L 5 speed
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Asked by 3Vern Feb 17, 2015 at 01:27 PM

Question type: Maintenance & Repair

Vehicle easily passed smog test two years ago; now fails due to quite high NOx.  Catalytic convertor replaced one year ago. EGR is 2 years old and functions normally.  Engine idle is remarkably smooth, but exhaust system now runs unusually hot at highway RPM; timing at idle is correct.  There is no O2 sensor.  Question: should there be an O2 sensor on this vehicle?

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3Vern answered 9 years ago

Thanks!!! Clarification from 3Vern: Right now O2 sensor is missing from vehicle - if it ever had one. Subaru company district engineer says it never had an O2 sensor. My question : Is he correct? (Vehicle = 1985 Subaru GL wagon 1.8L 5 speed) Second question : Jim - what are the abreviations OBD and HTH ?

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3Vern answered 9 years ago

Thanks again!!! More clarification from 3Vern: There is no 'check engine' or 'service engine soon' light. I initially assumed the O2 sensor was not reinstalled when the catalytic convertor was replaced one year ago. But then I could not find an appropriate electrical plug anywhere in the wiring harness to plugin a wire from an O2 sensor - does anyone have a wiring diagram or is one available somewhere online? (vehicle: 1985 Subaru GL wagon 1.8L 5 speed - not the turbo) - 3Vern

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