Engine Performance problem
1999 Honda Accord 4 cyl Front Wheel Drive Automatic 104000 miles
i have a problem with the same code (P0420) coming back. I own a actron auto scanner model cp9180. I look the code up and I get catalyst efficiency below threshold bank 1. And when I look at the freeze screen all different reading seem to be within their value range meaning they seem to be reading normal except for the (st ftrm1 %= -7.7) (lt ftrm1 %= -9.2) (st ftrm3 %= -100.6) (lt ftrm3 %= -100.6) these mean short term fuel trim bank 1 =st ftrmX bank 1 and bank 3. Bank 1 and bank 3 long term air to fuel ratio correction factor = lt ftrmX. I really don't know what all this really means. I recently did a small tune up plugs, oil and oil filter, air filter. The only other thing I could think of is to change plug wires and distributor cap and rotor. I am a little mechanically inclined more than the average joe. But these newer cars there is a lot of electronics that run the vehicle. So if you could please help me with any info or point me in the right direction I would be very greatful. Thank you for your time and effort.
Wednesday, February 24th, 2010 AT 9:39 PM