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 MANUALSCHEVROLET1992CAVALIER RS, 2D CONVERTIBLE, 3.1 T, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 4 (ENGINE CONTROLS - TESTS W/CODES - 3.3L PFI)PCM/BCM CODE CHARTSCODE 13, OPEN OXYGEN (O2) SENSOR CIRCUITNOTES
1992 Chevrolet Cavalier RS, 2D Convertible, 3.1 T, Standard
Code 13, Open Oxygen (O2) Sensor Circuit: Notes
1992 Chevrolet Cavalier RS, 2D Convertible, 3.1 T, StandardSECTION Notes
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1992 Pontiac Grand Am, 1992 Oldsmobile Cutlass Cruiser, 1992 Oldsmobile Cutlass Ciera, 1992 Oldsmobile Achieva, and 1992 Buick Skylark. However, it is still accessible from the selected car via links, so may be relevant.
CODE 13 ECM TERMINAL & CIRCUIT WIRING IDENTIFICATION
| Application | ECM Terminal | Wire Color |
|---|---|---|
| O2 Signal | YE14 | Purple |
| O2 Ground | YE15 | Tan |
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This tests if problem still exists. Vehicle cannot enter "closed loop" mode if O2 sensor circuit is open. Code 13 indicates an open in O2 sensor circuit. Code will set if:
- Engine is at normal operating temperature.
- Neither Code 21 nor Code 22 is stored.
- O2 sensor voltage is constant within a specified range (.34-.55 volt).
- Throttle angle is greater than idle.
- A precalibrated amount of time has elapsed since start-up.
- All conditions have existed for a precalibrated amount of time.
- Determines if O2 sensor, wiring or control module is at fault. If wiring is good, grounding O2 sensor wire will cause .45 volt reference supplied by control module to pull low.
- This tests O2 sensor circuit wiring. Use only a high impedance (10-megohm minimum) digital voltmeter.
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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.