If the leaks are gone but the code persists, test the System Main Relays (SMR1, SMR2, and the Pre-charge relay). A sticking SMR can show a false isolation failure.
Do not immediately assume you need a new Hybrid Battery ($2,000+) if you see P1AC000. Start with the basics: toyota p1ac000 better
| Metric | Toyota P1AC000 | Typical Aftermarket (e.g., Fram PH4967) | | :--- | :--- | :--- | | | Silent, immediate pressure | 1-2 secs of rattle | | Oil Analysis (Si levels) | <5 ppm (excellent) | 10-15 ppm (elevated) | | Change Interval | 10k miles (safe) | 5-7k miles (recommended) | | Bypass Valve Accuracy | ± 1 PSI | ± 5 PSI | If the leaks are gone but the code