MISFIRES AND AIR INJECTION SYSTEM

Question

MISFIRE CODES P0301, PO302, AND P0303. WHERE TO CHECK FOR LEAKS, ETC.
CODE P0411, WHERE TO CHECK SECONDARY AIR INJECTION SYSTEM INCORRECT FLOW DETECTED.

Answer 1

P0301, P0302 , P0303. Misfire cylinder 1 and 2 and 3

P0411 Secondary air injection

P0411 affects the MAF (mass airflow) this is where the misfire occurs, When there is a P0411 and misfire the most likely suspect that causes this is the PCV system or the Drainback.