Honda Accord fluctuating idle issue with high idle at 1500 RPM despite O2 sensor replacement on Honda Accord

Some Honda Accord owners report experiencing a fluctuating idle issue, with a high idle at 1500 RPM, even after replacing the O2 sensor. These owners often find that a faulty idle air control valve (IACV), vacuum leaks, or problems with the throttle position sensor (TPS) can contribute to this high idle. Additionally, vacuum leaks may result in a rough idle, despite the car performing well otherwise, prompting some to check for cracked engine mounts. Furthermore, the idle air control valve can become stiff and sticky over time, leading to idle problems; cleaning it with carb cleaner and ensuring it operates smoothly can help resolve the issue. Therefore, it is advisable for owners to inspect the IACV, check for vacuum leaks, and verify the TPS's functionality to address these persistent idle concerns.