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high NoX, no pass emissions

Discussion in 'General Tech and Maintenance' started by deadhooker, Feb 10, 2010.

  1. deadhooker

    deadhooker New Member

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    Hi All,

    I've got a 91 Civic that I believe has the stock motor. It has now failed emissions twice, both times with a high nox reading.

    Any ideas on what to inspect or replace?

    all new cap,rotor, plugs,wires,etc. I did a search and alot of stuff came up with possible o2 sensor. If so, which one would I inspect?
     
  2. Briansol

    Briansol Admins Admin VIP

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    o2 sensor is likely the cause... that or a bad cat.
     
  3. deadhooker

    deadhooker New Member

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    stupid cats, this will be my 3rd in the last month (not this car, a different one).

    Also, it has an engine light on. The oil light is also on, but it has good pressure and does indeed have oil. Where could I just buy an obd1 scanner?
     
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