Question

I have a 2001 Toyota Sienna with engine codes P0171 and P0174. How do I fix it?

Answer 1

P0171 TOYOTA - Air/Fuel Mixture System Lean Bank 1
Read more: https://www.autocodes.com/p0171_toyota.html

P0174 TOYOTA - Air/Fuel Mixture System Too Lean Bank 2
Read more: https://www.autocodes.com/p0174_toyota.html

Answer 2

Hi there,

These are lean codes for both banks of the engine. Usually when you have the lean codes on both banks it's normally a result of low fuel pressure or a faulty mass air flow sensor. This is because it's affecting the whole engine and not just one bank.