1990 Mazda 626 MASS AIRFLOW SENSOR

I'm not sure what the issue is. If the mass air flow sensor has been diagnosed as defective, you can order one for your specific application and replace it yourself. Thank you for listing the engine size. Be aware there are two different 2.2L engines. One uses a turbocharger. Most likely the mass air flow sensor is the same for both applications, but if your engine uses a MAP sensor too, that will be different. That sensor measures intake manifold vacuum, and with a turbo, the intake can go into a pressure situation. The MAP sensor has to be able to measure that too.

The main thing to watch out for when replacing the mass air flow sensor is there can't be any air leaks between it and the throttle body. If any air sneaks in that doesn't go through the sensor. It won't get measured, so no fuel will be commanded to go with it.

What I meant was I don't know what the issue is with your mechanics. The Engine Computer will learn the characteristics of the new sensor. All you have to worry about is the sensor must be the correct part number for your car's year, model, engine size, and other options.

I don't know what you have for auto parts stores. Here in the U.S. We have Carquest, Auto Zone, Advance Auto, NAPA, and O'Reilly Auto. Those are the big ones. I found your mass air flow sensor on O'Reilly's web site for $190.00. They want your old one traded in.

The fuel pump must never have voltage with just the ignition switch turned on. If it did, that would pose a serious fire hazard if a fuel line got ruptured in a crash. You need to check for voltage to the pump while a helper is cranking the engine.