Non-Methane Hydrocarbon Catalyst (NMHC) Monitor Some diesel vehicles include an extra catalyst called a Non-methane Hydrocarbon Catalyst. It’s designed to remove non-methane hydrocarbons (NMH) left over from the combustion process from the exhaust stream. The NMH catalyst materials react with the exhaust gases to convert CO, HC, Particulate Matter and Soluble Organic Fraction into CO2 and H2O. The computer checks the efficiency of the catalyst by monitoring the quantity of NMH in the exhaust stream. The monitor also verifies that sufficient temperature is present to aid in particulate matter (PM) … Read More
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