Question

2002 BMW 530i 3.0L with OBD2 codes P0172 and P0174, what would cause both codes?

Answer 1

According to our database of repairs for your model year and the engine codes P0172 and P0174, the Crankcase Ventilation Control Valve is the most likely cause of the problem.

P0172 BMW Code - Mixture Control System Too Rich Bank 1
Read more: https://www.autocodes.com/p0172_bmw.html

P0174 BMW Code - Mixture Control 2 System Too Lean Bank 2
Read more: https://www.autocodes.com/p0174_bmw.html