What is a PO174 code on a 2002 Toyota Highlander?

Question

What is a PO174 code mean on a 2002 Toyota Highlander?

Answer 1

most likely an intake leak, check the engine bay hoses, and air filter

 

Possible causes

- Intake air leaks

- Faulty front heated oxygen sensor

- Ignition misfiring 

- Faulty fuel injectors 

- Exhaust gas leaks

- Incorrect fuel pressure

- Lack of fuel

- Faulty Mass Air Flow (MAF) sensor

- Incorrect Positive Crankcase Ventilation (PCV) hose connection