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.
the engine light stays on and sometimes blinks. MPG seems to stay the same at 20 MPG. replaced coils and plugs with no change
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.
My check engine light is on and when I used the code reader it stated that it's the massive air flow sensor, but I replaced that it and it still doesn't work.
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.