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 MANUALSCADILLAC1993SEVILLE BASEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - PCMPCM CODE CHARTSPCM CODE P043 - FRONT OXYGEN SENSOR RICH SIGNALACTION
1993 Cadillac Seville Base
Pcm Code P043 - Front Oxygen Sensor Rich Signal: Action
1993 Cadillac Seville BaseSECTION Action
PCM turns on SERVICE ENGINE SOON light. PCM turns on canister purge solenoid if Code P045 is also set.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- If PCM Code P017 is present, diagnose this code first since an oxygen sensor not ready can cause other emission related problems.
- If oxygen sensor is operating correctly, voltage should fluctuate at less than 0.6 volt. A rich sensor condition will cause voltage to remain at greater than 0.6 volt.
- If voltage measured is less than one volt, PCM and circuit No. 1589 are okay. See CHART 8 under POWERTRAIN CHARTS.
RENDER: 1.0x
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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.