Hello all
I have a 2000 ES300 with the code P0171, any suggestions of what to look for? Any information would be helpful. I've seen suggestions from you tube and replaced those parts but the code is still present.

So far I've replaced
-MAF
-2 O2 sensors (one in the front and back of engine)
-VVT solenoids
-Hose that goes from intake to engine (circled in red in picture)

Best regards

 

Hello,

Where did you get all the parts? I would only trust OEM components here, and those can run a pretty penny, MAF alone is more than $200. I would return all original parts back, as they are a lot more trustworthy than aftermarket components.

Here is a thread on a Lean mixture code. In short, check that your intake is more or less tight plugging the intake while the car is running, it should stall almost immediately. If that's good, check MAF and A/F sensor readouts, refer to thread above for more information.

Hope this helps and best of luck!