Skip the auto shop - Our mechanics make house calls

Q: What exactly does the code P3fff mean?

asked by on

The check engine light is on. It drives fine. It shifts fine,it drives with no hesitation. But it failed emissions with 2 P3fff codes. Plus, "exhaust gas recirculation flow insufficient detection" and "mass or volume air flow circuit range/performance problem". It makes a high pitch whine when I put it in reverse. Does not whine as I drive.

My car has 80000 miles.
My car's transmission is unknown to me.

A: Hi there. The code P3fff means that there i...

Hi there. The code P3fff means that there is an issue with the PCM (the computer to the vehicle). The codes regarding gas recirculation flow and mass air flow are coming on either due to the PCM failure or due to the fact that the EGR valve and MAF sensor has failed. Check the EGR valve for burned wires and to determine if the valve is working. Take the valve off, clean it out, and then put it back on with a new gasket.

Then, check the MAF sensor and see if there are any burned wires and if the sensor is clean. The whine could be the reverse gear in the transmission, which may use the type of gear that always whines, which would be a normal condition. If you need further assistance troubleshooting your vehicle, then seek out a professional technician, such as one from Your Mechanic, who can come to your location to determine why the service lights are on and what repairs are needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: EPC Light is on and engine will not start

Hello, thanks for writing in about your Volkswagen Jetta. Did you check the output (volume) of the fuel pump? From what you've described, it sounds like you are not getting sufficient fuel to the fuel injectors. For an issue like...

Q: 3 warning lights on, power steering, VMS, and electronic lights. Any clue?

The fact that these lights are on is a warning to the driver that there are fault codes stored because one of more control systems have detected a problem. The vehicle will have to be read with a code scanner...

Q: Car shaking after Check Engine light came on.

It sounds like you have a cylinder misfiring. I would recommend having a technician come out and check the code on the car to determine what is causing the misfire. It could be a wide range of things such as...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.