When a mass air flow sensor problem occurs, resulting in a loss of power or hesitation on acceleration, the Check Engine Light will illuminate, perhaps indicating random cylinder misfire. The mass air flow sensor may respond to cleaning, but replacement of the sensor is best.
Hesitation or Misfire Due to Failed Mass Air Flow Sensor on Toyota 4Runner
Average mileage: 134,000 (134,000–134,000)
8 people reported this problem
1 person shared problem details
2000 Toyota 4Runner134,000Visitor
This has happened 5 times since I purchased this auto in 2001. It happened 3 times in 3 years. The problem is happening again. The check light came on just two days ago, it has been two years since event. This flow sensor has cost me over $500.00 so far. It has been cleaned, replaced. Why does it go out so often? Houston.Tx
A toyota certified machanic has informed me I need to replace my mass air flow sensor on my 99...
no problem just upgrading to a performance air sensor.
upgrading to a performance Jet Chip air sensor