Car Problem Reports

Toyota Tacoma Lean Mass Air Flow Sensor Causing Code P0170

Toyota Tacoma Problem
8 Reports
Me Too

Model Years Affected: 1995, 1996, 1997, 1999

Average Mileage: 163,750 mi (110,000 mi - 235,000 mi)


Occasionally, the mass air flow sensor can go lean and set a code P0170 for fuel system lean. This in not an oxygen sensor problem. If there are no vacuum leaks, the mass air flow sensor may need to be replaced. Our technicians remind us to use a factory part because the aftermarket rebuilds are very inconsistent.

  • Visitor, , 235,000 mi

    Don't buy a new Mass Air a Flow Sensor. Clean the old one. I've cleaned the old one 2 or 3 times now -- still have factory original. Can easily be accessed and cleaned with a Q-tip and rubbing alcohol.

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  • Visitor, , 170,000 mi

    just took electrical cleaner to the sensor, worsk fine now.

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  • Visitor, , 140,000 mi

    Mine did this. Cleaned it with a can of spray injector cleaner. Warning. Spray softly, mass air flow sensor has very fine wire elements in it that can be damaged.

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