said by miscnick :
Actually the most common cause is a plugged fuel filter...maybe 10-15$.
Next common IS the O2 sensors, maybe 50$ each.
LEAST common cause is the mass airflow, cost about 300$.
I speak from personal experience repairing that exact DTC on that exact model.
I stand by everything I have said, and disagree with your opinions based on firsthand experience.
said by miscnick :
Again we get fuzzy math, please stop it.
It isn't funny math. The numbers are about understanding what the ECM uses to make the judgment whether to turn on the MIL.
Using them and the freeze frame data (stored with the DTC) or the live data are part of diagnosis.
said by miscnick :
I've seen many more torn intake bellows on a Toyota than I ever have mass airflow sensors...
Checking that is certainly valid. My whole point all along has been to diagnose the problem, not throw parts at it.
On that model I have never seen a torn 'intake bellows', but I have seen airflow meters cause this DTC (P0171).