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 Lexus GS 300 BaseFACTORY OEM SERVICE PROCEDURE
External Pages
These are pages that do not belong to the exact selected vehicle (2018 Lexus GS 300 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 car
- Section 1 (Engine Control System - Diagnostics - Introduction (1 Of 3))
- Section 2 (Emission Control System (Service Information))
- Section 3 (Engine Control System - Service Information)
- Section 4 (Engine Control System - Diagnostic Codes (7 Of 7) & Circuit Tests)
- Section 5 (Automatic Transmission (Aa81E) - Diagnostics - Introduction)
- Section 6 (Automatic Transmission (A760H) - Diagnostics - Introduction)
- Section 7 (Vehicle Stability Control System - Diagnostics - Introduction)
- Section 8 (All Wheel Drive Control System - Diagnostics - Introduction)
- Section 9 (Transfer Case - Service Information)
- Section 10 (Charging System - Diagnostics - Introduction)
- Section 11 (Engine Lubrication System (Service Information))
- Section 12 (Fuel System - Service Information)
- Section 13 (Intake / Exhaust System (Service Information))
- Section 14 (Fuel System - Inspection)
- Section 15 (Battery / Charging System - Service Information)
- Section 16 (Engine Mechanical - Service Information)
- Section 17 (Drive Shaft / Propeller Shaft - Service Information)
- Section 18 (Engine Cooling System (Inspection))
- Section 19 (Engine Control System - Diagnostic Codes (3 Of 7))
- Section 20 (Engine Control System - Diagnostic Codes (6 Of 7))
- Section 21 (Engine Control System - Diagnostic Codes (1 Of 7))
- Section 22 (Engine Control System - Diagnostics - Introduction (3 Of 3))
- Section 23 (Engine Control System - Diagnostic Codes (2 Of 7))
- Section 24 (Engine Control System - Diagnostics - Introduction (2 Of 3))
- Section 25 (Engine Intake System (Inspection))
- Section 26 (Ignition System (Inspection))
- Section 27 (Engine Control System - Diagnostic Codes (2 Of 4))
- Section 28 (Engine Control System - Diagnostics - Introduction)
- Section 29 (Engine Control System - Diagnostic Codes (4 Of 4) & Circuit Tests)
- Section 30 (Emission Control System (Inspection))
- Section 31 (Engine Intake System) (Inspection))
- Section 32 (Engine Control System - Service Information)
- Section 33 (Engine Control System - Diagnostic Codes (1 Of 4))
- Section 34 (Fuel System - Inspection)
- Section 35 (Fuel System - Service Information)
- Section 36 (Ignition System (Inspection))
- Section 37 (Engine Mechanical - Service Information)
- Section 38 (Intake / Exhaust System - Service Information)
- Section 39 (Emission Control System (Service Information))
- Section 40 (Engine Cooling System - Service Information)
- Section 41 (Engine Control System - Diagnostic Codes (4 Of 7))
- Section 42 (Engine Control System - Diagnostic Codes (5 Of 7))
- Section 43 (Automatic Transmission (A760H) - Service Information)
- Section 44 (Automatic Transmission (A760H) - Diagnostic Codes (2 Of 2) & Circuit Tests)
- Section 45 (Automatic Transmission (A760H) - Diagnostic Codes (1 Of 2))
- Section 46 (Automatic Transmission (Aa81E) - Diagnostic Codes (4 Of 4) & Circuit Tests)
- Section 47 (Automatic Transmission (Aa81E) - Diagnostic Codes (3 Of 4))
- Section 48 (Engine Cooling System (Service Information))
- Section 49 (Engine Lubrication System (Inspection))
- Section 50 (Charging System - Service Information)
- Section 51 (Automatic Transmission (Aa81E) - Diagnostic Codes (1 Of 2) & Circuit Tests)
- Section 52 (Charging System - Diagnostic Codes & Symptom Tests)
- Section 53 (Starting System - Service Information)
- Section 54 (Automatic Transmission (A760H) - Diagnostics - Introduction)
- Section 55 (Starting System (Service Information))
- Section 56 (Engine Cooling System (Inspection))
- Section 57 (Automatic Transmission (Aa81E) - Diagnostics - Introduction)
- Section 58 (Automatic Transmission (Aa81E) - Diagnostic Codes (2 Of 2))
- Section 59 (Engine Control System - Diagnostic Codes (3 Of 4))
- Section 60 (Charging System - Diagnostics & Symptom Tests)
- Section 61 (All Wheel Drive Control System - Diagnostic Codes & Symptom Tests)
- Section 62 (Automatic Transmission (Aa81E) - Diagnostic Codes (2 Of 4))
- Section 63 (Engine Cooling System - Diagnostics & Circuit Tests)
- Section 64 (Automatic Transmission (A760H) - Diagnostic Codes & Circuit Tests)
- Section 65 (Engine Lubrication System (Inspection))
- Section 66 (Engine Lubrication System - Service Information)
- Section 67 (Automatic Transmission (Aa81E) - Diagnostic Codes (1 Of 4))
- Section 68 (Engine Control System - Diagnostics & Symptom Tests)
- Section 69 (Engine Cooling System - Diagnostics & Circuit Tests)
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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