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 P1195: Slow Upstream O2 Sensor During Catalyst Monitor: Description
Circuit is monitored with engine running, engine coolant temperature more than 170°F (77°C), open throttle, steady to slightly increasing vehicle speed (more than 18 MPH but less than 55 MPH), with a light load on engine for no less than 5 minutes. DTC is set when O2 sensor voltage is switching from less than .39 volts to more than .6 volts and back fewer times than required. Possible causes for DTC to set are: O2 sensor 1/1 ground circuit open, O2 sensor 1/1 connector failure, defective O2 sensor 1/1, engine uses oil or coolant, exhaust system leaks or defective Powertrain Control Module (PCM) connector.
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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.