And, most of the time they are right by the air box and easy to replace.įaulty Mass Airflow Sensor Symptoms: Nissan Altima If you do determine that you need a new mass airflow sensor, they aren’t too expensive. The ECU uses this information along with other sensor data to control the amount of fuel that enters the combustion chamber. It passes this information onto your Altima’s ECU. A bad mass airflow sensor can leave your Nissan Altima’s engine running rough, or even inoperable.Ī MAF sensor measures the density of the air entering the intake manifold. I suspect an aftermarket MAF was used by the shop that previously attempted the repair, though I was told the part was OEM manufacturer.The mass airflow sensor (commonly abbreviated to MAF) is one of the most important engine management sensors. This is a revisit of a problem that has occurred in the past.
Grounds checked, potential vacuum leaks checked and MAF replaced with genuine Nissan part. Mass Air Flow sensor failed again, setting the car in limp mode. Problem solved and car drives smoother with new fluid. Shield was removed and CVT fluid changed while car was in shop. Heat shield above transmission was rotten and vibrating against the transmission causing a noise that sounded like it was coming from the transmission. ECU reflashed with an update from Nissan that is supposed to solve the false MAF code that keeps returning. Check engine light returns with same MAF code. Noise no longer there at this time.Ĭheck engine light indicated problem with Mass Air FLow sensor but there were no driveability problems. Change of oil from 5w-30 conventional to 5w-30 synthetic seems to have quieted the tensioner. Timing chain tensioner made rattle noise for 1-2 seconds on cold start. Replaced water pump and belt.įaulty o-ring replacement in oil housing. Dealer replaced O2 sensor under warranty.Įxhaust manifold heat shield rattling. Vehicle threw a code for throttle position sensor. Nissan warranty for cat converters is 8 years or 80,000 miles. Dealer replaced exhaust manifold with cat converter mount.
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