Just had a CA smog test from a star center. The results are okay, except NOx as below:
HC(ppm) 18/59(max.)@15mph(1663rpm), 13/34 @25mph(1616rpm)OK
CO(%) 0.03/0.34@15mph, 0.02/0.32@25mph OK(PASSED)
%CO2 14.6@15mph, 14.6@25mph
%O2 0.2@15mph, 0.1@25mph
NO(ppm) 710/484 @15mph, 797/498 @25mph NOT OK (FAILED)
Note that the mechanics took quite a long time doing the test, and said that the engine was too hot, temp. gauge passed middle, was about a quarter to red zone.
Few months ago, I also had a one-time error code 77, EGR value #3 error; it never showed again after reset though.
The catalytic conveter/Oxy sensor are about 2 and a half year old.
Please let me know what wrong and how to fix the NOx error.
Thanks in Advance.
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