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.
1995 Saab 900 SE, 2D Hatchback, StandardFACTORY OEM SERVICE PROCEDURE
Knock Sensor (KS)
- Connect timing light. With engine running at a fast idle, tap cylinder head with a plastic mallet. If timing retards, knock sensor is okay. If timing does not retard, turn ignition switch off and go to next step.
- Locate knock sensor under intake manifold. Unplug connectors from sensor and ignition ECM. Inspect wiring between knock sensor and ECM connector. See the WIRING DIAGRAMS - 2.3L 4-CYL article. If open or short circuit is located, repair as necessary. Reconnect knock sensor and ECM, and retest system. If wiring is good, go to next step.
- Temporarily replace knock sensor with known good unit. Repeat step 1). If timing still does not retard, reinstall original sensor and replace ECM.
Factory Service Tools
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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.
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