The BMW Diagnostic Trouble Code (DTC) P1130 corresponds to an "Oxygen Sensor Heater Control Circuit" issue. Here's what it typically means:
**P1130 - Oxygen Sensor Heater Control Circuit**
This DTC indicates that there is a problem with the control circuit for the oxygen sensor heater. Oxygen sensors in modern vehicles often have built-in heaters to ensure they reach and maintain their operating temperature quickly. A properly functioning oxygen sensor is crucial for accurate fuel mixture control and emissions reduction.
Common causes of a P1130 code in a BMW include:
1. **Faulty Oxygen Sensor Heater:** The oxygen sensor's internal heater element may be malfunctioning, causing it not to heat up properly.
2. **Wiring or Connector Issues:** Damaged or corroded wiring, connectors, or terminals related to the oxygen sensor heater circuit can result in a malfunction.
3. **Faulty Oxygen Sensor:** In some cases, the oxygen sensor itself may be faulty, including its heater element.
4. **ECM/PCM Issues:** There could be a problem with the engine control module (ECM) or powertrain control module (PCM) that affects the oxygen sensor heater circuit.
To diagnose and address a P1130 code, a qualified technician typically performs the following steps:
1. **Visual Inspection:** Inspect the wiring, connectors, and terminals related to the oxygen sensor heater circuit for damage, corrosion, or loose connections.
2. **Check the Oxygen Sensor Heater:** Test the oxygen sensor's heater element for proper function. This may involve checking for resistance or voltage readings, depending on the sensor type.
3. **Wiring Inspection:** Verify the integrity of the wiring harness and conduct a continuity test to identify any breaks or short circuits.
4. **Data Monitoring:** Use a diagnostic scan tool to monitor live data, including oxygen sensor readings and heater circuit status, to help identify any discrepancies or abnormalities.
