P0430
#4
TECH Senior Member
Originally Posted by 2001NBMZ28
You can try swapping the rear 02's from side to side and see if it throws P0420, but most of the time it's the cat.
swap O2s and see if the code follows ("reset" the PCM after swapping)
if it follows... then it's a bad o2 sensor... if not it's a bad cat (likely bat cat)
now... if it's a bad cat... GM recently extended the warranty on cats due to problems... (EPA requires 8 year/80k mile... i think GM extended to 10k/100k mile) ... though don't know if it applies to 98s ... I know 00-02 were covered
#5
thanks
Originally Posted by MasnarT
I just had the #420 and it was the driverside cat and in june I had #430 otherside, and had both done under warranty.....runs alot better