What codes do you have ? Doesn't necessarily mean mass air flow sensor is bad , could be circuit problem !
SOURCE: check engine light
It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
Good luck and hope this helps.
I had a problem on my Nissan Xterra 2000. Symptons sound similar. In my case, it ran fine for a while and then suddenly the engine starts to stumble and lose output. At one point it did not even have enough HP to move. Irregular idling too. Thought it was water in my fuel. Bought water remover from the store and added to gas tank. Problem did not go away. Instead, "Service Engine Soon" light came on. Had to have it towed to the dealer as there was no way the engine could keep up with traffic. Dealer replaced the "Crank Position Sensor" today. Parts $33.00, Labor: $300 (about 3 hrs worth of work). Seems to work fine now but I will wait and see. Dealer also stated that Distributor bearing appears to be noisy and will need to be replaced sooner or later. I will wait for it to go before I fix that.
SOURCE: Repalced O2 sensors, mass air flow sensor, and plugs error messag
dpfe velve
small emissions valve with one electrical connnector and three to four vacume lines located near your egr valve. this is a comon fault on fords emmissions system.
SOURCE: 98 Lincoln Navigator Check Eng light on
fuel pump is going out causing the truck to run lean and miss
SOURCE: ford focus tdci wont start
probably injector take off little black leak off pipes 1 at a time on injectors if 1 spitting out excessively probably that injector down (1 new injector solved my problem)
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