P0405
EGR Sensor A Circuit Low
2001-2003 BMW 525iT E39 2.5L I6 🇨🇦
Moderate SeverityPowertrain
Description
Low voltage from the EGR position sensor A.
Symptoms
- Check Engine Light
- EGR control issues
Common Causes
- Short to ground in sensor circuit
- Faulty sensor
- Wiring damage
Diagnostic Steps
- Test sensor voltage
- Check for shorts
- Inspect wiring
Repair Notes
Repair wiring or replace EGR valve (sensor often integrated).
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
P0405 on Other Vehicles
Common Questions
What does code P0405 mean on a 2001-2003 BMW 525iT E39?
P0405 stands for "EGR Sensor A Circuit Low". Low voltage from the EGR position sensor A.
What are the symptoms of P0405 on a BMW 525iT E39?
Common symptoms of P0405 include: Check Engine Light, EGR control issues.
What causes P0405 on a 2001-2003 BMW 525iT E39?
Common causes of P0405 include: Short to ground in sensor circuit, Faulty sensor, Wiring damage.