Slightly lean conditions are the main reason for high NOx readings.Lower HC readings are always better for engine and converter efficiency.If high HC readings exist along with O2 readings, a misfire or cylinder imbalance may be inferred - This may cause the converter to overheat and the shell to glow red and discolor, resulting in substrate meltdown.High HC reading can result in excessive carbon restricting the converter.High readings indicate rich condition and are an indicator of incomplete combustion.CO reading should be close to but slightly higher than the O2 reading (well within.<.5% Balanced with <.5 O2, but normally not zero
High readings indicate a lean condition that can result in a false P0420 code.02 reading should be close to but often slightly lower than CO reading (well within.<.5% Balanced with <.5 CO, but normally not zero Single cylinder misfire in a 4-cylinder engine reduces reading by 25%.Higher readings indicate high efficiency.co2 is an indicator of complete combustion.
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