i have a code reading of po420 and a code read of po300, i do know that the po300 is multiple misfire and the po420 is catalyst system effiency below threshold, what does this mean?
2005 nissan altima 2.5s
car stuttering and loss of power when trying to accelerate, engine service light
flashes.Feels like the car is going to stall out when in idle.
start by replacing the spark plugs, then any coils if they are defective reset computer and drive it a bit
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