Car runs rich wont pass smog
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
high NOX = too hot = too lean. the one i had that failed with high NOX needed an o2 sensor, so i would check yours. there is a diagnostic port you can put an LED into, and you can then see the 02 sensor cycle when its in closed loop, or not if the sensor is dead
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jsnow82
Single Turbo RX-7's
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Jan 17, 2016 10:21 AM