I have a 2012 maxima and must share this. At 50k got a P0101. I Replaced MAF & code returned. Since it seemed to be running ok I put it on the back burner. Performance slowly degraded and at 58k I dove deeper into this. I borrowed a good scan tool from a friend and started diagnosing. After going into the Nissan Enhance Program it showed a code for the CVT transmission manual switch. I decided to drop CVT pan and replace the NS-2 fluid. Also, replaced CVT fluid cooler filter. I removed 4 quarts of fluid but it took 5 quarts to refill(center of hash marks while running and hot). Guess what happen next? The P0101 MAF sensor code dissappeared along with the CVT manual switch code. I cannot believe how good this car is running and gas milage improved. Diagnosis with a scanner that can read Nissan codes is a must! My friend that lent me the scanner told me the transmission and engine communicate with each other. Sometimes the tranny has an issue and tells the engine to do strange things with air fuel causing the P0101. So, my problem was the tranny. Low CVT fluid and diry filters caused this issue.
