Fuel Control Mixture Lean Bank 1
2001-2003 BMW 525i E39 2.5L I6 🇨🇦
Description
The DME detected a lean fuel mixture condition on Bank 1 that exceeds the long-term fuel trim correction range. This indicates the engine is receiving too little fuel or too much air on Bank 1, and the adaptive fuel trim has reached its compensation limit.
Symptoms
- Check Engine Light
- Rough idle
- Hesitation on acceleration
- Poor fuel economy
- Possible misfire at idle
Common Causes
- Vacuum leak on Bank 1 intake side
- Weak fuel injectors Bank 1
- Low fuel pressure from fuel pump
- Faulty MAF sensor under-reading airflow
- Cracked intake boot or DISA valve failure
Diagnostic Steps
- Check for vacuum leaks using smoke test
- Monitor short-term and long-term fuel trims on Bank 1
- Test fuel pressure at rail
- Inspect intake boot and DISA valve
- Test fuel injector flow rates
Repair Notes
Repair vacuum leaks first, then check fuel delivery components if trims remain lean.
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
P1083 on Other Vehicles
Common Questions
What does code P1083 mean on a 2001-2003 BMW 525i E39?
P1083 stands for "Fuel Control Mixture Lean Bank 1". The DME detected a lean fuel mixture condition on Bank 1 that exceeds the long-term fuel trim correction range. This indicates the engine is receiving too little fuel or too much air on Bank 1, and the adaptive fuel trim has reached its compensation limit.
What are the symptoms of P1083 on a BMW 525i E39?
Common symptoms of P1083 include: Check Engine Light, Rough idle, Hesitation on acceleration, Poor fuel economy, Possible misfire at idle.
What causes P1083 on a 2001-2003 BMW 525i E39?
Common causes of P1083 include: Vacuum leak on Bank 1 intake side, Weak fuel injectors Bank 1, Low fuel pressure from fuel pump, Faulty MAF sensor under-reading airflow, Cracked intake boot or DISA valve failure.