Is your truck running rough? Gas mileage taking a nosedive? That dreaded "check engine" light could mean big trouble...or a super easy fix! In this video, I'll break down. This video is about troubleshooting a Toyota Tundra with a P0171 trouble code, which means the system is too lean on both Bank 1 and Bank 2. Here are 3 things you will learn in this video:

How to diagnose a P0171 trouble code
How to check fuel pressure
How to replace a fuel pump
In short, the mechanic finds that the car is running lean because of low fuel pressure. He then replaces the fuel pump and the car runs much better.


00.00 - Introduction
00:50 - I am revving the engine observing its performance under load
01:52 - Checking codes with scanner
02:37 - Install original mass airflow sensor
05:00 - Checking fuel pressure
07:28 - Dropping the fuel tank
08:41 - Install new fuel pump
09:26 - Recheck fuel pressure after installing new pump
09:50 - Test drive to confirm repair