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 MANUALSBUICK1995REGAL CUSTOM, 4D SEDAN, 3.8 LREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 3.1LECM/PCM CODE CHARTSCODE 43, KNOCK SENSOR ERRORNOTES
1995 Buick Regal Custom, 4D Sedan, 3.8 L
Code 43, Knock Sensor Error: Notes
1995 Buick Regal Custom, 4D Sedan, 3.8 LSECTION Notes
NOTE:
Test numbers refer to numbers on diagnostic chart.
- If conditions for code exist, scan tester will always indicate "yes" when knock signal is monitored. If an audible knock is heard from engine, repair internal engine problem. No engine knock should be detected at idle.
- PCM applies 5-volts on sensor signal line.
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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.