(August 31, 2021 at 11:23 am)Jehanne Wrote: I can't afford to fix my catalytic converter ($2K repair); car runs just fine.
What are you driving?
Most vehicles post 1995 have an upflow and a downflow O2 sensor. (Before and after catcon).
If the catcon is dead your computer will compensate to get the lower O2 level it wants - but you will in reality will be running rich.
The vehicle will not pass emmission testing ( where required) and some of the excess fuel ends up in the crankcase as blow-by, contaminating your oil and shortening engine life.
Got a check engine light showing?
