Here are some of the most common causes of error code P1470 on a BMW 740IL:
- Faulty secondary air injection pump: The SAI pump is responsible for injecting air into the exhaust system. If the pump fails, the SAI system will not be able to function properly.
- Leaking or damaged air hoses: The SAI system uses hoses to transport air from the pump to the exhaust system. If these hoses leak or become damaged, the SAI system will not be able to function properly.
- Faulty air injection check valve: The air injection check valve prevents air from flowing back into the engine. If the check valve fails, the SAI system will not be able to function properly.
- Electrical problems: The SAI system is controlled by a series of electrical components, such as relays and sensors. If any of these components fail, the SAI system will not be able to function properly.
If you are experiencing error code P1470 on your BMW 740IL, it is important to have the vehicle diagnosed and repaired by a qualified mechanic.
