How do I fix P0101: Mass or Volume Air Flow Circuit Range/Performance?

Probably the MAF sensor needs to be cleaned (carefully) or replaced.

 

Hi. Please give me some details. Which is MAF sensor? I have same problem P0101. Thanks.

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Thanks for your kind answer.

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Probably noted in the videos, but: there's a very specific cleaner to use: Mass Air Flow Sensor Cleaner (aka MAF Sensor Cleaner). It's readily available in North America, by CRC for one.

You're in Romania, Rome, or??

 

Solving this problem is quite easy.

First things first.

Remove the MAF if you can, and inspect it for dirty. If you've got dirt's stuck in the thermistor of the MAF sensor, it sends a weird kind of signals to the car's ECU, and in term, you might get misfire issues, and excess fuel consumptions.

Secondly, do a voltage test(I mean check if you've got power being fed to the sensor from the ECU wiring harness. If you're not getting, 12volts(I can't remember the specified voltage input), the sensor would send wrong signals.

Thirdly, do a ground test, to confirm if the circuit is complete. If it isn't, you've got problem in your hands.

Fourthly, and the most important, is to do a signal voltage test. In this test, the MAF, monitors and measures the amount of incoming ambient air, and converts this signal(m/g) to a 5volt signal, which it sends to the ECU, for proper metering of the fuel system.

Fifth, would be a last resort, if after you've done all the aforementioned tests, and the situation still persists, the ECU or the MAF sensor wiring harness to the ECU might be the culprit.

Do relay to the house your findings pls.

PS: The FFD is very important in troubleshooting this.

Dxta

 

Thanks a lot.

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Romania.

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I had the same P0101 on my 2011 Prius. Taking my cue from this forum, I cleaned the MAF, twice. I cleaned the throttle body. I reset the codes. They returned. After a couple of months of this, I took my Prius into a local repair shop. Fuel Pump!! $950 later, I was repaired. A side benefit, is that the indicated fuel mileage was repaired as well. It had been reading 40mpg when I was actually getting 50mpg. I guess the sensor in the fuel pump thought it was moving more fuel than it actually was.

 

Here is a related question thread. I'd appreciate any thoughts there. Thanks!

2008 prius mass air flow sensor problem | PriusChat