Question

I got the engine codes P0171, P0174, and P0015 on my 2008 Toyota Sienna, what is the meaning of the codes?

Answer 1

Hi there,

P0015 is a timing over advance code, P0171 and P0174 are both lean codes. Meaning the fuel mixture is not rich enough or doesn't have enough fuel in it to make the computer happy. It is likely there is a timing issue causing the cam sensor code, if the timing is off it can also cause the lean fuel mixture issue. i would start by checking the timing. If the timing is good, then replace the cam position sensor, and check the fuel pressure which can cause the lean fuel mix on both banks as well as the mass air flow sensor.

Answer 2

P0015 TOYOTA Code - Camshaft Position 'B' Timing Over-Retarded Bank 1
Read more: https://www.autocodes.com/p0015_toyota.html

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

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