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how do i fix this?
Posted: Sun Oct 21, 2007 1:18 pm
by danielc24
i was going through a drive thru yesterday and my check engine light came on and this is the code i got.
P0420(M) 1/1 Catalytic Converter Efficiency Catalyst 1/1 efficiency below required level.
what does this mean?
Posted: Sun Oct 21, 2007 1:20 pm
by kc2005ptgt
I believe that is your upstream o2 sensor - either going bad, or gone bad, or cat is bad, or... wait till someone more knowledgable gets on... but that's a start!
Posted: Sun Oct 21, 2007 1:21 pm
by danielc24
well i've had horrible gas mileage for a while now and my car seems sluggish taking off.
Posted: Sun Oct 21, 2007 1:25 pm
by ZeroChad
Posted: Sun Oct 21, 2007 4:45 pm
by dblsg
thats the infamous code you get with running with no cat. so either you need a new cat or the downstream sensor might be bad. i had my car with that code for over a year.... i recently installed my cat back on.... and then the damn sensor wires snapped
so i still have that code. car runs fine though.