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Emission test help. I got a 93 Mercury Topaz that had high NoX. What should I do?


Yes, the EGR is the most likely cause. Other causes are a bad catalytic converter, of a high operating temperature caused by a faulty thermostat, low coolant, or a cooling fan not working.

This entry was posted on Monday, December 14th, 2009 at 6:42 am and is filed under nox emission. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “Emission test help. I got a 93 Mercury Topaz that had high NoX. What should I do?”

  1. have the egr valve looked at. that is what controls nox emissions
    References :

  2. Yes, the EGR is the most likely cause. Other causes are a bad catalytic converter, of a high operating temperature caused by a faulty thermostat, low coolant, or a cooling fan not working.
    References :

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