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 MANUALSVOLVO1991940 TURBO, 4D SEDAN, AW71LREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESSELF-DIAGNOSTICS - TURBO SYSTEMCLEARING CODESERASING DIAGNOSTIC SYSTEM MEMORY
1991 Volvo 940 Turbo, 4D Sedan, AW71L
Erasing Diagnostic System Memory
1991 Volvo 940 Turbo, 4D Sedan, AW71LSECTION Erasing Diagnostic System Memory
- After all fault codes have been read and faults corrected, diagnostic system memory can be erased. Turn ignition switch to ON position. Read fault codes again. Depress push button for longer than 5 seconds.
- After 3 seconds, the LED should light. While the LED is lit, depress push button again for more than 5 seconds. Release button. LED should be out. Disconnect battery cable to erase codes.
- To ensure memory is erased, depress push button for more than 1 second and less than 3 seconds. A flash code 1-1-1 denotes erased memory.
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.