The BMW Diagnostic Trouble Code (DTC) P1260 corresponds to a "Throttle Return Spring Weak (Bank 1)" condition. Here's what it typically means:
**P1260 - Throttle Return Spring Weak (Bank 1)**
This DTC indicates that there is a problem with the throttle return spring in Bank 1 of the engine. Bank 1 typically refers to the side of the engine where cylinder 1 is located. The throttle return spring is responsible for returning the throttle to its closed position when you release the accelerator pedal. If the spring is weak or damaged, it may not provide sufficient tension to close the throttle properly, which can affect engine performance and idle control.
Common causes of a P1260 code in a BMW include:
1. **Weak or Damaged Throttle Return Spring:** The throttle return spring may have weakened over time or become damaged, preventing it from closing the throttle effectively.
2. **Throttle Linkage Issues:** Problems with the throttle linkage, such as binding or obstructions, can affect the throttle's ability to return to the closed position.
3. **Throttle Body Issues:** Malfunctions or damage to the throttle body itself can affect the operation of the throttle return spring.
4. **Wiring or Connector Problems:** Damaged or corroded wiring, connectors, or terminals related to the throttle position sensor or throttle control system can result in communication errors.
To diagnose and address a P1260 code, a qualified technician typically performs the following steps:
1. **Visual Inspection:** Inspect the throttle linkage and the throttle return spring for damage, binding, or obstructions.
2. **Check Throttle Body:** Examine the throttle body for malfunctions or damage that may affect the throttle operation.
3. **Inspect Throttle Position Sensor:** Check the throttle position sensor (TPS) and its wiring for proper function and any issues.
4. **Data Monitoring:** Use a diagnostic scan tool to monitor live data, including throttle position sensor readings, to help identify the source of the issue.
