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Got this code on my car saying system too rich. I cleaned the MAF and it seems fine was clean when I pulled it out. Can anyone tell me what my problem could be before I go spending money.
 

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P0172 NISSAN Possible Causes

What does/could this mean?

Faulty Front Heated Oxygen Sensor
Faulty Spark Plugs
Faulty Mass Air Flow (MAF) sensor
Exhaust Gas Leaks
Ignition Misfiring
Incorrect Fuel Pressure
Faulty Fuel Injectors

Your best option is to have a shop diagnose and pinpoint the problem before you throw money at the problem, without knowing what the problem is.
 
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