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1993 Volvo 940: Nitrogen Oxides Emissions

posted by  onlyVolvo on  Sat May 24 13:32 CST 2014
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last visit: Thu Jun 26 20:57 CST 2014
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My 1993 Volvo 940 recently passed its California smog emissions test except for Nitrogen Oxides (NOx). The test pass level for NOx is 486 ppm max. My car emitted 521 ppm of NOx. I suspect that there may be a problem with the EGR System, (e.g., clogged valve, bad temperature sensor, etc.) Any advice will be greatly appreciated... I do not believe that the issue has anything to do with the Catalytic Converter as the Hydrocarbon % was well within the test limits.

Many thanks,

OnlyVolvo






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