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 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
Use PROBLEM SYMPTOMS to find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in order. If necessary, replace these parts.
PROBLEM SYMPTOMS
| Symptom/Suspect Area | See | |
|---|---|---|
| Noise | ||
| (1) Oil (Level Low) | ) Replace Transaxle Oil | |
| (2) Oil (Wrong) | ) Replace Transaxle Oil | |
| (3) Gear (Worn Or Damaged) | HYBRID TRANSAXLE INTERNAL COMPONENTS | |
| (4) Bearing (Worn Or Damaged) | HYBRID TRANSAXLE INTERNAL COMPONENTS | |
| Oil Leakage | ||
| (1) Oil (Level Too High) | ) Replace Transaxle Oil | |
| (2) Gasket, (Damaged) | HYBRID TRANSAXLE EXTERNAL COMPONENTS | |
| (3) Oil Seal (Worn Or Damaged) | DIFFERENTIAL OIL SEAL | |
| (3) Oil Seal (Worn Or Damaged) | INPUT SHAFT OIL SEAL | |
| (3) Oil Seal (Worn Or Damaged) | HYBRID TRANSAXLE COMPONENTS | |
| (4) O-Ring (Worn Or Damaged) | OIL PUMP ASSEMBLY | |
| (4) O-Ring (Worn Or Damaged) | HYBRID TRANSAXLE COMPONENTS | |
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.