Replaced mass airflow sensor in 2001 tacoma twice. Is their a way to clean, bypass, etc. new unit lasts about two months, ie engine light comes back on and mechanic is ready to replace sensor, clean airfilters, well maintained vehicle. hesitates when engine light is on, will not start without the sensor?

If the new unit only lasted a couple of months, and the engine light goes back on, I think that you should try to have it replaced at the auto parts store under their 90 day warranty policy, if they have that.

Try to go to a reputable source such as Autozone or Advance Auto Parts where they have a more liberal return and refund policy.

Usually, a MAF sensor once replaced shouldn't go bad in such a short time span.

Maybe, check that the voltage to the MAF sensor is not too much for the sensor, causing it to go bad. If that's the case, the computer reference signal voltage may be the culprit.

Good luck on this repair.

If u replaced your maf sensor it shouldnt be foin bad so fast. u must teset youre fuel adaptives and or kam memory kepp alive memory so your computer is not relying on previous parameters or specification levels it has used in the past. it needs to learn the new learning for youre new sensor. only a good quality scan tool can do this. so u will probably have to go to an import shop or dealer. hope this helps

You can buy the Mass Airflow sensor cleaner at most Auto Parts store including Wall-mart. and i would recommend you to get your engine light code read to see what the problem is.
Your car could be running to Rich in fuel and air or to Lean in air and fuel.