Gm’s 1.4L turbocharged 4-cylinder engine, commonly found in the Chevy Sonic, Cruze and Buick Encore, has a well-known issue resulting in a lean code, P0171, and often times oil consumption and/or an engine whistle noise. This issue is often only partially repaired resulting in repeat failures. This video breaks down the process for diagnosis and repair. Enjoy!

https://gotech.com/learn/how-to/fix-p...

0:00 Intro
0:27 Symptoms/trouble code
0:50 Proving its running lean
1:10 Testing PCV valve
2:47 Checking non-return valve
4:31 Removal of intake manifold and valve cover
6:57 RTV sealer location
7:28 Valve cover torque sequence
7:51 Intake manifold installation
9:11 Confirming fix
10:28 Summary