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.
2008 Saturn Astra L4-1.8LFACTORY OEM SERVICE PROCEDURE
Transmission Position Sensor/Switch: Locations
Automatic Transmission Electronic Component Views
Electronic Components View
32 - Transmission Fluid Temperature Sensor
72 - Park/Neutral Position Switch
74 - Transmission Output Speed Sensor Assembly
76 - Transmission Input Speed Sensor Assembly
301 - Neutral Switching Solenoid Valve
310 - Lock Up Control Solenoid (SLU)
312 - Line Pressure Control Solenoid Valve Assembly (SLT)
313 - 2-3, 3-4 Shift Solenoid Valve Assembly (S1)
316 - 1-2/3-4 Shift Solenoid Valve Assembly (S2)
Powertrain Component Views
Automatic Transmission
1 - Park/Neutral Position (PNP) Switch
2 - X121
3 - Output Speed Sensor
4 - Input Speed Sensor
Factory Service Tools
Use the Manual With the Right Hardware
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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.