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 4Runner Lean Mass Air Flow Sensor Causing Code P0170
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Visitor, 2000 Toyota 4Runner, 311,000 mi
P0170 code was showing when tested, chcked for vacuum leaks and found a cracked vacuum hose, replaced and code was gone.
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