When the automobile camshaft gear is damaged, it may cause the following problems:

1. Unstable engine operation: Damaged camshaft gear will lead to abnormal camshaft rotation, affect the opening and closing timing of valves, and lead to unstable engine operation, even jitter and fire.

2. Increased engine noise: Damaged camshaft gear will lead to poor gear engagement or abnormal noise, which will lead to increased engine noise, and sharp or metallic impact sound may occur, which will affect driving comfort.

3. Abnormal valve operation: The damage of camshaft gear will affect the normal operation of the valve, which will lead to the failure to open or close the valve accurately, affect the air intake and exhaust efficiency, and reduce the engine performance and combustion efficiency.

4. Engine power decline: The damage of camshaft gear will affect the normal working timing of the valve, resulting in poor air intake and exhaust, reducing the gas flow efficiency in the combustion chamber and reducing the engine output power.

5. Engine fault light comes on: The damage of camshaft gear may cause the engine control unit to detect abnormal signals, which will trigger the engine fault light to come on, prompting the driver that there is something wrong with the engine and it needs to be repaired in time.

To sum up, the damaged camshaft gear of an automobile may cause problems such as unstable engine operation, increased noise, abnormal valve operation, decreased engine power, and engine fault light on, which seriously affects the performance and safety of the vehicle and needs to be repaired or replaced in time to ensure the normal operation of the vehicle.