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.
2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
External Pages
These are pages that do not belong to the exact selected vehicle (2018 Subaru WRX Base), but are still accessible from a link in your vehicle's manual. Be very cautious using repair info from here because these pages may not apply to your vehicle.
- Different variant/trim
- Section 1 (Starting System & Charging System (STI))
- Section 2 (Continuously Variable Transmission (Diagnostics))
- Section 3 (CVT Transaxle (Tr690) (Service Information))
- Section 4 (Engine Lubrication System (STI))
- Section 5 (Engine Control System (Diagnostics - Introduction) (STI))
- Section 6 (Engine Cooling System (STI))
- Section 7 (Fuel Injection System (STI))
- Section 8 (Engine Mechanical (STI))
- Section 9 (Engine Intake System (Induction) And Turbocharger (STI))
- Section 10 (Exhaust System (STI))
- Section 11 (Emission Control Systems (Aux. Emission Control Devices) (STI))
- Section 12 (Engine Control System (Diagnostics) (General) (STI))
- Section 13 (Manual Transaxle & Differential (TY85))
- Section 14 (Engine Ignition System (STI))
- Section 15 (Engine Control System (Diagnostics) (1 Of 4) (STI))
- Section 16 (Engine Control System (Diagnostics) (2 Of 4) (STI))
- Section 17 (Engine Control System (Diagnostics) (3 Of 4) (STI))
- Section 18 (Engine Control System (Diagnostics) (4 Of 4) (STI))
- Section 19 (Speed Control System (STI))
- Different car
- Section 1 (General Information & Specifications)
- Section 2 (Eyesight System)
- Section 3 (CVT Transaxle (Tr690))
- Section 4 (Common Diagnostic Procedures)
- Section 5 (Vehicle Dynamics Control (VDC) System)
- Section 6 (SUBARU Eyesight System (Driver Assist) (Diagnostics))
- Section 7 (Lighting System)
- Section 8 (Window Glass & Mirrors)
- Section 9 (Body Control System (Diagnostics))
- Section 10 (Instrumentation System & Driver Information Center)
- Section 11 (Entertainment System)
- Section 12 (Sunroof)
- Section 13 (Air Bag System (Diagnostics))
- Section 14 (Air Bag System)
- Section 15 (Security And Locks - Keyless Access (W/Push Button Start) (Diagnostics))
- Section 16 (Engine Starting System & Charging System)
- Section 17 (Brake System)
- Section 18 (Manual Transaxle & Differential (TY75))
- Section 19 (Engine Cooling System)
- Section 20 (Tire Pressure Monitoring System (TPMS) (Diagnostics))
- Section 21 (Engine Control System (Diagnostics) - Introduction)
- Section 22 (Immobilizer System (Diagnostics))
- Section 23 (Wiper System & Washer System)
- Section 24 (Power Windows (Diagnostics))
- Section 25 (Blind Spot Detection/Rear Cross Traffic Alert System (Diagnostics))
- Section 26 (Engine Lubrication System)
- Section 27 (Engine Ignition System)
- Section 28 (Engine Mechanical System)
- Section 29 (Fuel Injection System)
- Section 30 (Engine Intake System (Induction))
- Section 31 (M/T Clutch System)
- Section 32 (A/T & M/T Differentials)
- Section 33 (Parking Brake System)
- Section 34 (Brake Control (Diagnostics))
- Section 35 (Front Suspension And Wheel Alignment)
- Section 36 (Rear Suspension System)
- Section 37 (Axle Shafts, Propeller Shaft & Hubs)
- Section 38 (Tires, Wheels & Tire Pressure Monitoring System (TPMS))
- Section 39 (Power Steering System)
- Section 40 (Power Steering System (Diagnostics))
- Section 41 (HVAC System (Heater, Ventilator And A/C))
- Section 42 (Anti-Theft System - Security And Locks)
- Section 43 (Speed Control System)
- Section 44 (Emission Control Systems (Aux. Emission Control Devices))
- Section 45 (Exterior Trim & Interior Trim)
- Section 46 (Seat System - Seats)
- Section 47 (Exhaust System)
- Section 48 (Exterior Body Panels)
- Section 49 (LAN Communication System (Diagnostics))
- Section 50 (Instrumentation System (Diagnostics))
- Section 51 (Engine Control System (Diagnostics) (General))
- Section 52 (OEM Wiring Diagrams W/ Connector End Views & Fuse/Relay Locations)
- Section 53 (Transmission Control System)
- Section 54 (Electric Brake Booster (Diagnostics))
- Section 55 (Continuously Variable Transmission (Diagnostics))
- Section 56 (Cruise Control System)
- Section 57 (HVAC System (Diagnostics))
- Section 58 (Reverse Automatic Braking System)
- Section 59 (Seat Belt System)
- Section 60 (Exterior Lights (Diagnostics))
- Section 61 (Front Relay Control Module (Diagnostics))
- Section 62 (Body Control/Communication System)
- Section 63 (Horn System)
- Section 64 (Cockpit Control System (Diagnostics))
- Section 65 (Telematics System (Diagnostics))
- Section 66 (Security And Locks - Keyless Entry (Diagnostics))
- Section 67 (Cruise Control System (Diagnostics))
- Section 68 (SUBARU Eyesight Assist Monitor (Driver Assist) (Diagnostics))
- Section 69 (Blind Spot Detection/Rear Cross Traffic Alert System)
- Section 70 (Reverse Automatic Braking System (Diagnostics))
- Section 71 (Engine Control System (Diagnostics) (1 Of 4))
- Section 72 (Engine Control System (Diagnostics) (2 Of 4))
- Section 73 (Engine Control System (Diagnostics) (3 Of 4))
- Section 74 (Central Gateway System (Diagnostics))
- Section 75 (Engine Control System (Diagnostics) (4 Of 4))
- Section 76 (Steering Angle Sensor (Diagnostics))
- Section 77 (Electronic Suspension (Diagnostics))
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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