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 kimmydoll 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.

13,600

Karmon answered 7 years ago

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

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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? 1 Answer

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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?

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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?

1 Answer

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