P0171 Lexus -Cleaned air flow sensor no leaks could it be oxygen sensor

Question

What are ways to to test air flow sensor

Answer 1

P0171 Fuel system lean Bank 1

Usually if this was the MAF (mass airflow) you would have both bank 1 and 2 being a code , you would also have a lean surge. The ways to check the MAF is to measure the MAF signal voltage at 2500 RPM its signal voltage will be at 0,2 Volts to 0.5 volts if its is lower than this the ECM will match incorrect MAF air value .P0171 lean condition can also be 02 sensor and even sparkplugs being worn  which will cause a lean ignition. and this includes fuel injector blockage.