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.
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HOMESERVICE MANUALSCHEVROLET1995CAVALIER LS, 4D SEDAN, 2.2 4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 2.3L (W/OBD-II)DIAGNOSTIC TROUBLE CODESDTC P1133 - O2S INSUFFICIENT SWITCHING SENSOR 1CONDITIONS FOR SETTING THIS DTC ARE AS FOLLOWS
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4
Conditions for setting this DTC are as follows
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4SECTION Conditions for setting this DTC are as follows
- Number of lean to rich counts is less than 10 or rich to lean counts is less than 15.
- Engine speed is 1825-2275 RPM.
- TP sensor angle is 8.2-14 percent.
- Purge learn memory is greater than 192.
- Evaporative emission control system is commanded open for greater than 50 percent Pulse Width Modulated (PWM).
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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.