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?

Asked by Jul 20, 2017 at 12:13 PM about the 2005 Nissan Altima 2.5 S

Question type: Maintenance & Repair

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.

1 Answer

1,590

start by replacing the spark plugs, then any coils if they are defective reset computer and drive it a bit

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