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 P0133: 1/1 O2 Sensor Slow Response: Description
1/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine coolant temperature more than 147°F (64°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 HO2S voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes for DTC to set are: engine mechanical problem, exhaust leak, defective 1/1 HO2S, defective connectors or defective wiring.
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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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