Great news guys! The light came back on again! Took it back down there. Po420 and Po360... I believe he said o2 system and catalytic converter but ill check later..
OK. Knock sensor may be bad. Or your spark plugs are toast. What type of fuel you using? The knock sensor is right under the intake manifold on top of starter. Looks like a black spacer plug
420 9 times out of 10....you need a new catalytic converter.
Price em out at auto zone and advance auto. I'm sure they aren't expensive. I paid like 20$ for a chevy venture knock sensor before.