Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Kia Borrego LX, 3.8 1, RWDFACTORY OEM SERVICE PROCEDURE
DTC P0139: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2): Specifications
(Reference only)
VOLTAGE SPECIFICATION CHART
| Test Condition | HO2S Voltage (Sensor1) | HO2S Voltage (Sensor2) |
|---|---|---|
| HO2S Signal at idle after warm-up | Signal is commonly switching from rich to lean more than 3 times in 10 sec. | Signal is commonly above 0.6V. |
| HO2S signal at open circuit (Pumping current OFF) | Approx. 0.45V | |
| HO2S signal at open circuit (Pumping current ON) | Approx. 3.5V | |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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