Failed emmissions - codes 0400-0300-0443
P0300 Random Misfire, means any cylinder at anytime.
P0400 Exhaust Gas Recirculation Flow. EGR passages are full of carbon
clean passages and misfires may go away
P0443 Evaporative Emission Purge Control Valve circuit.
now just because a code is present doesn't mean a part/sensor is bad, just where to look and to test.
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