Q: check engine light read mass air flow sensor

First of all, cleaning a mass air sensor may not have fixed the sensor and O2 sensors cannot be cleaned. The O2 sensors for bank 1 and bank 2 means that the left and right side of the engine. You have one sensor just below the manifolds on each side of the motor and then sensors after the catalyst. There may be more than three or four sensors on the truck depending on if you have dual exhaust catalyst or not. Each sensor will have a specific code that relates to it in the computer when a failure happens. Your O2 sensors may only be telling you that you are running too lean on both banks of the engine and may have a mass air sensor or fuel injection fuel flow problem that is the cause. Have a mechanic properly diagnose the Check Engine Light before replacing or cleaning the sensors to try and fix the issue. A qualified mechanic will have to do the pinpoint tests to isolate the cause. This will save you money in the long run by not replacing parts that are not needed.