Got a question i'm hoping you guys can help me out with... Check engine light came on with codes 420 & 432 which translate to "Catalyst 1/1 efficiency below required level" & "Catalyst 2/1 efficiency below required level" respectively. Thought I figured it out when i noticed a broken vac line on top of the engine, but after replacing and reseting the computer the codes popped back up within 55 miles. Thought it could be the spark plugs (come to find out they were the original NGKs from 80K miles ago) so I swapped out the plugs. Same thing within 55 miles. My next thought is replacing the two O2 sensors after the precats, but I figured i'd tap the wealth of knowledge that is JF before I continue to fumble around blindly. Thanks!