2006 Hyundai Alantra P0172 code

Question

P0172 code

replaced oxygen sensor on 2006 Hyundai Alantra. Engine code came back on. What's next?

Answer 1

This code is for a rich fuel mix. The sensor is usually the reporter and not the problem. The following can cause this code and need to be inspected individually to determine the problem.

restricted intake or exhaust system

over full or dirty engine oil

MAF sensor or front O2 sensor

High fuel pressure

Leaking fuel injectors