P0172 Ford - e350

Question

p0172 code with a check engine light is on. I replace 02 sensor bank 1. I also cleaned the map sensor.

Answer 1

Hi Mark

Either one of the bank 2 O2 sensors can cause this code. If you only replaced one and don't have a scan tool that can read live data it's difficult to know which one to replace. A leaking fuel injector can also cause this problem on a single side of the engine.