The mass air flow sensor on higher mileage cars occasionally needs to be cleaned or replaced if sluggish acceleration is experienced or the Check Engine Light is illuminated with a mass air flow meter sensor fault code stored.Google+
Car Problem Reports
Toyota Sienna Cleaning May Correct Faulty Mass Air Flow Sensor
Toyota Sienna Problem
Engine Affected: 3.0L V6
Average Mileage: 112,000 mi (82,000 mi - 140,000 mi)
Visitor, 2001 Toyota Sienna, 3.0L V6, 91,000 mi
I had check engine light coming on. They told me to replace catalytic converter but I was getting the check light indicator the Midas people told me to replace o2 sensor, with no luck. Now they told me to replace mass air flow sensors.
I have spent almost 2000 USD. I will NEVER BUY A TOYOTA SIENNA AGAIN.
Visitor, 2000 Toyota Sienna, 3.0L V6, 135,000 mi
the engine light stays on and sometimes blinks. MPG seems to stay the same at 20 MPG. replaced coils and plugs with no change
Visitor, 2002 Toyota Sienna, 3.0L V6, 82,000 mi
Changed Air Filter (not from Toyota but quite similar) and Check engine light went on in 15 minutes of driving. Code: Engine running lean. Need to clean MAF. I will buy the MAF sensor cleaner today.
Visitor, 2001 Toyota Sienna, 3.0L V6, 140,000 mi
Check engine light was on. Disconnect battery and drive car about 50 miles before it would pass inspection (emission standard). Finally took it to dealer. Cleaned MAF. Light is off but only driven 25 miles thus far.