BMW 3 Series
P0423
The P0423 code indicates that there is an issue with the heated oxygen sensor (HO2S) circuit in the catalytic converter system of a BMW 3 Series E90/E91 (2005-2012). This code typically points to a malfunction in the sensor or its associated wiring.
2 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Symptoms
7 common
- •Check engine light illuminated
- •Poor fuel economy
- •Increased emissions
- +4 more
Most Affected Generations
2 generations
E90
1
F30
1
Severity Levels
1 level
medium
2
Quick Facts
2
Total Solutions
0
Affected Components
7
Common Symptoms
2
Generations
All Solutions
Showing 2 of 2 solutions for error code P0423 across all generations.