I followed your procedure, and I'm assuming I'll pass the smog test with my old catalytic converter. Does this mean I will pass it again next year without doing your recommended stunt all over again?


If you passed the smog test this year because you followed my recommended procedure, you need to do the same thing again year after year. Keep in mind the vehicle’s computer system will reset and return to its old settings shortly after completing 150 miles of run time. My recommended procedure is intended to go around your vehicle’s computer readings only up to a certain number of miles, around 150 to maybe 300 miles.

Updated on April 12, 2018

Original Article:

How to Pass a Smog Test With an Old Catalytic Converter
By Daniel Mollat