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The diagnostic trouble code P0733:00-68 indicates that there is an incorrect gear ratio detected in Gear 3. This code typically points to a problem with the automatic transmission system of a vehicle.

Here are some possible causes and solutions for this issue:

1. Low transmission fluid level: Insufficient transmission fluid can cause improper gear shifting and lead to incorrect gear ratios. Check the transmission fluid level and ensure it is at the appropriate level. If it is low, refill it to the recommended level and inspect for any leaks that may be causing the fluid loss.
2. Dirty or contaminated transmission fluid: Dirty or contaminated transmission fluid can affect the performance of the transmission and lead to incorrect gear ratios. Consider performing a transmission fluid flush and filter replacement to ensure clean fluid is circulating in the system.
3. Faulty transmission shift solenoid: The transmission shift solenoids are responsible for controlling the engagement of different gears. A malfunctioning shift solenoid can result in incorrect gear ratios. A professional mechanic should perform diagnostic tests to identify and replace any faulty shift solenoids.
4. Mechanical issue with the transmission: Internal mechanical problems within the transmission, such as worn or damaged components, can cause incorrect gear ratios. If this is the case, a thorough inspection and potential repair or rebuild of the transmission may be necessary. It is recommended to consult a qualified mechanic or transmission specialist for proper diagnosis and repair.
5. Software or programming issues: In some cases, the incorrect gear ratio can be caused by software or programming glitches in the transmission control module. Updating or reprogramming the control module with the latest software from the manufacturer may help resolve the issue. A professional mechanic or dealership can perform this task.

It is important to note that these are general suggestions, and the specific diagnostic and repair procedures may vary depending on the make, model, and year of your vehicle. If you are unsure or uncomfortable performing these steps yourself, it is recommended to seek assistance from a qualified mechanic or dealership. They will have the expertise and tools to accurately diagnose and resolve the issue with the incorrect gear ratio in Gear 3.