Question

2003 Chevrolet Suburban 350, what is most likely fix for P0172 and P0175?

Answer 1

HI there,

This code can be the result of something simple like a plugged or dirty air filter, or something a little bit bigger like the engine coolant temp sensor. The truck is running rich according to these codes, and since it's on both sides of the engine it's usually something that affects both banks like a dirty air filter.

Answer 2

P0172 CHEVROLET - Fuel Trim System Rich Bank 1
Read more: https://www.autocodes.com/p0172_chevrolet.html

P0175 CHEVROLET - Fuel Trim System Rich Bank 2
Read more: https://www.autocodes.com/p0175_chevrolet.html