mazda390
5/17/2007 3:52:07 AM
I have a 1997 Mazda 626 2.0L engine. I ran the OBDII test and came up with error P0421, my error def. is listed below.
Po421 is a warm-up catalyst efficiency below limit code.
Q= What exactly is the problem, and how do I fix it.
Any help is greatly appreciated.
