[wazzy440]

im glad some one posted on this subject.... tonight I was driving my lincoln ls 2002 v8. I was getting on it and when I went from 1-2 gear I noticed the cleck engine light pop on... pulled the code same thing 420.. now When i bought the thing it had 4 bad coil packs and who knows how long the prevous owner was driving with the bad coil packs.... im pretty much figuring the cat is pluged up. im going to let it idle in the garage and shoot the temps of each cat and compare.. which ever one it hotter is the plugged one and if ones hollow.. ill replace that one. anyone know how much a cat is? im going to see about ebay tonight