garajizOBD-II code · manufacturer-specific
P1139
HO2S Transition Time Ratio Sensor 1
- System
- P1 — Powertrain (manufacturer-specific)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P1139 mean?
P1139 is defined as “HO2S Transition Time Ratio Sensor 1”.
You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.
Manufacturer-specific meanings
The same code can mean something different on some makes.
- Subaru: Front Oxygen AF Sensor #1 Heater Circuit Performance Range Problem
- Buick, Cadillac, Chevrolet, Chrysler, GM, GMC, Oldsmobile, Saturn: HO2S Insufficient Switching Bank 1 Sensor 2
- Volkswagen: Long Term Fuel Trim Add Fuel Bank 2 System Too Rich
- BMW: O2 Sensor Heater Circuit High Voltage Bank 1 Sensor 2
- Ford, Lincoln, Mercury: Water In Fuel Indicator Circuit Malfunction
Related codes
Look up another code
This page is general information; an exact diagnosis needs measurements and a technician’s check.