Fuel Rail Pressure Sensor Circuit
1999-2000 BMW 323i E46 2.5L I6
Description
The DME detected a malfunction in the fuel rail pressure sensor circuit. The sensor signal is outside the expected voltage range, preventing accurate fuel pressure monitoring. This affects both direct injection and common rail diesel systems.
Symptoms
- Check Engine Light
- Engine may not start
- Reduced power mode
- Rough idle
- Engine stalling
Common Causes
- Faulty fuel rail pressure sensor
- Damaged wiring to fuel rail sensor
- Corroded sensor connector
- DME internal fault
- Sensor reference voltage issue
Diagnostic Steps
- Test sensor supply voltage (should be 5V reference)
- Check sensor signal voltage range
- Inspect wiring and connector for damage
- Test sensor resistance
- Swap sensor if available to confirm
Repair Notes
Replace fuel rail pressure sensor after confirming wiring and connector integrity.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1188 on Other Vehicles
Common Questions
What does code P1188 mean on a 1999-2000 BMW 323i E46?
P1188 stands for "Fuel Rail Pressure Sensor Circuit". The DME detected a malfunction in the fuel rail pressure sensor circuit. The sensor signal is outside the expected voltage range, preventing accurate fuel pressure monitoring. This affects both direct injection and common rail diesel systems.
What are the symptoms of P1188 on a BMW 323i E46?
Common symptoms of P1188 include: Check Engine Light, Engine may not start, Reduced power mode, Rough idle, Engine stalling.
What causes P1188 on a 1999-2000 BMW 323i E46?
Common causes of P1188 include: Faulty fuel rail pressure sensor, Damaged wiring to fuel rail sensor, Corroded sensor connector, DME internal fault, Sensor reference voltage issue.