P0402
EGR Flow Excessive Detected
1992-1996 BMW 318is E36 1.8L I4 🇬🇧
Moderate SeverityPowertrain
Description
The EGR system is flowing too much exhaust gas.
Symptoms
- Check Engine Light
- Rough idle
- Stalling
- Surging
- Poor acceleration
Common Causes
- EGR valve stuck open
- Faulty EGR solenoid
- Vacuum leak to EGR valve
- Faulty DPFE sensor reading low
Diagnostic Steps
- Check EGR valve for stuck-open condition
- Test EGR solenoid
- Check vacuum lines
- Test DPFE/position sensor
Repair Notes
Replace EGR valve if stuck open. Repair vacuum lines.
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
P0402 on Other Vehicles
Common Questions
What does code P0402 mean on a 1992-1996 BMW 318is E36?
P0402 stands for "EGR Flow Excessive Detected". The EGR system is flowing too much exhaust gas.
What are the symptoms of P0402 on a BMW 318is E36?
Common symptoms of P0402 include: Check Engine Light, Rough idle, Stalling, Surging, Poor acceleration.
What causes P0402 on a 1992-1996 BMW 318is E36?
Common causes of P0402 include: EGR valve stuck open, Faulty EGR solenoid, Vacuum leak to EGR valve, Faulty DPFE sensor reading low.