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.
Car Problem Reports
Toyota Tacoma Lean Mass Air Flow Sensor Causing Code P0170
Toyota Tacoma Problem
Average Mileage: 140,000 mi (110,000 mi - 170,000 mi)
Visitor, 1997 Toyota Tacoma, 170,000 mi
just took electrical cleaner to the sensor, worsk fine now.
Visitor, 1997 Toyota Tacoma, 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.