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.
2003 Saturn L300FACTORY OEM SERVICE PROCEDURE
Component Locations
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Accelerator Pedal Position Sensor | On Accelerator Pedal Bracket |
| A/C Compressor Clutch Relay | In Underhood Fuse Block |
| Camshaft Position Sensor | Right Front Of Engine, On End Of Cylinder Head |
| Crankshaft Position Sensor | Lower Left Side Of Engine |
| EGR Solenoid | Top Right Of Engine, Near Intake Runner |
| Electronic Ignition Modules | In The Center Of The Camshaft Covers |
| Engine Control Module | Left Rear Of Engine, On Rear Intake Runner |
| Engine Coolant Temperature Sensor | Right Side Of Engine, In Intake Manifold |
| EVAP Purge Solenoid | On Engine, Attached To Right Side Of Cylinder Head |
| EVAP Vent Solenoid | Rear Of Vehicle, Near Fuel Filler Tube |
| Fuel Injectors | Top Of Engine, Under Fuel Rail |
| Fuel Pressure Regulator | On Fuel Injection Rail, Near Service Fitting |
| Fuel Pump Relay | In Underhood Fuse Block |
| Fuel Tank Pressure Sensor | Under Rear Of Vehicle, On Top Of Fuel Tank |
| Heated Oxygen Sensor, Bank 1 Sensor 1 | Rear Of Engine, In Exhaust Manifold |
| Heated Oxygen Sensor, Bank 1 Sensor 2 | Right Side Of Underbody, Behind Bank 1 Catalytic Converter |
| Heated Oxygen Sensor, Bank 2 Sensor 1 | Front Of Engine, In Exhaust Manifold |
| Heated Oxygen Sensor, Bank 2 Sensor 2 | Right Side Of Frame & Underbody, Behind Bank 2 Catalytic Converter |
| Intake Air Temperature Sensor | In Air Intake Tube |
| Intake Manifold Runner Control Solenoid | Left Side Of Engine, Under Upper Intake Manifold |
| Knock Sensor 1 | Rear Of Engine, Under Exhaust Manifold |
| Knock Sensor 2 | Front Of Engine, Behind The Generator |
| Main Relay | In Underhood Fuse Block |
| Manifold Absolute Pressure Sensor | Upper Left Of Engine, In Front Of ECM |
| Mass Airflow Sensor | In Air Intake Tube |
| Throttle Actuator Control Module | Right Front Of Engine, On Upper Intake Manifold |
| Throttle Position Sensor | Part Of Throttle Actuator Control Module |
| Underhood Fuse Block | Left Side Of Engine Compartment, Near Coolant Reservoir |
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.
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