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.
DTC P0137: 1/2 O2 Sensor Shorted To Ground: Description
Circuit is monitored at a cold start with engine coolant temperature less than 98°F (37°C), ambient temperature within 27°F of engine coolant temperature, and engine coolant temperature more than 170°F (77°C) on previous key off. DTC will set when 1/2 O2 sensor voltage is less than .156 volt for 28 seconds after starting engine. Possible causes are: defective HO2S, signal circuit shorted to ground or defective PCM.
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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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