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Emissions failed NOx. OBD indicates injectors. Exasperated, nearly $ broke 200 1989

posted by  bubba72834 on  Fri Mar 6 15:47 CST 2009
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last visit: Tue Mar 10 07:38 CST 2009
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Your logic makes sense, the O2 sensor might be giving a bogus reading. I don't think you are running rich though, you could expect significantly higher HC and CO readings if you were. I once had the very same symptoms on my '87 240; I spent a small fortune replacing all kinds of parts, not to mention more than $150 on all those failed inspections. Finally, after much stress, the culprit turned out to be a $5 airbox thermostat.






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