Question

My check engine lite came on and the code P0171 was read with scan. How do we fix this on my 2006 Toyota Tundra SR5 4.7L?

Answer 1

HI there,

The most common cause for the lean mixture code on bank 1 is either a leaking intake, leaking exhaust manifold or the front O2 sensor on bank 1. Check for leaks, if none are found, then try replacing the bank 1 o2 sensor BEFORE the converter.