OK, this is the 2nd time I've gotten these. The first time around, I replaced the offending exhaust manifold and O2 sensor under (barely) warranty. Now again!? Same manifold & same O2 sensor. No warranty now. (Waaay over the fed. catalytic warranty)
P0420, as I understand it, is a plugged pre-cat right? And P1151 indicates a lean condition, right?
Am I driving wrong or something, what would cause this twice?
Also, since I've pulled these codes, the car will sometimes stall under hard decelleration.
FYI: 98.5 SVT. Only mods are MAF adapter & K&N and removed resonator.
TIA,
-Chuck
