How to Clear P0102 Code Replace Mass Air Flow Sensor 2004-12 Nissan Altima L4 2-5L

Hi, I’m Mike from 1A Auto. We’ve been selling auto parts for over 30 years!

All right. So a Nissan has a check engine light on and it's running really rough. We're going to check for the diagnostic code that we're getting on this Nissan Ultima using the scan tool. We're getting a P0102, and it says MAF or VAF check low input. We're going to check the mass airflow meter. Make sure it's plugged in fully, and if it's not plugged in fully, we'll plug it in. If it's plugged in fully, we're going to replace it and see if that clears the code.

We're over here at the mass airflow sensor. It goes right in here in the intake tube after the air filter. Double checking the plug is in there and locked in place. As far as these wires go right here at the connector, where they kind of bend. They don't appear to be broken, so we're going to try and replace this mass airflow sensor.

To replace the mass airflow meter, that's this piece right here. Push the lock in, pull the connector off and set it aside. Our replacement comes with a matching security torques bit that fits right in there. It's a quarter-inch drive. To put the top on, I can use this quarter-inch drive tool. Just unscrew it. The other screw is on the opposite side here on the bottom. It's kind of tight to get the quarter-inch driver in there or a socket ratchet, so I'm just going to use a small quarter-inch wrench. Just going to put it in here. We just need to move it this way. Hold it with one finger, and like that. Once it's loose enough, I can just turn it with my hands. Grab the screw so I don't drop it. Pull the old mass air meter out.

Here's our original one from our vehicle and our brand new one from 1AAuto.com. This actually comes with two new screws, security torques, and the bit to install and remove them. Once you put in the car, it'll work great for you. On our sensor, it's got a tab here and a tab here on the intake tube that match up with these openings here and here, so you can only install it one way. Definitely doesn't fit that way, so I'll have to go in this way. Fits nice and even.

Install the screws. Take our supply torques bit, and you continue to just turn it with my fingers. Wrench till you feel it get tight. I'm just going to stop because it's just a metal screw going into a metal bushing that's inside this plastic. We don't want to strip it. Could use the let driver, top one. Reconnect it so it clicks. Mass air meter has been replaced. Now our check engine light is off.

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