Honda Civic
P0138
The P0138 code indicates that the oxygen sensor circuit for Bank 1 Sensor 2 (downstream oxygen sensor) is reading a high voltage, which may suggest a fault in the sensor or its circuit.
8 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Exhaust System
Symptoms
10 common
- •Check engine light illuminated
- •Poor fuel economy
- •Increased emissions
- +7 more
Most Affected Generations
3 generations
FL
4
FC/FK
3
FB/FC
1
Top Affected Components
1 component
Exhaust System
8
Severity Levels
1 level
medium
8
Quick Facts
8
Total Solutions
1
Affected Components
10
Common Symptoms
3
Generations
All Solutions
Showing 8 of 8 solutions for error code P0138 across all generations.