Fuel Control Mixture Lean Bank 2
1992-1998 BMW 318i E36 1.8L I4
Description
The DME detected a lean fuel mixture condition on Bank 2 beyond the correction capability of the long-term fuel trim. This often accompanies P1083 on V-configuration engines but can appear independently on Bank 2.
Symptoms
- Check Engine Light
- Rough idle
- Lean misfire under load
- Hesitation
- Poor fuel economy
Common Causes
- Vacuum leak on Bank 2 intake side
- Weak or clogged fuel injectors Bank 2
- Low fuel pressure
- Faulty MAF sensor
- Intake manifold gasket leak Bank 2
Diagnostic Steps
- Smoke test for vacuum leaks focusing on Bank 2
- Compare fuel trims Bank 1 vs Bank 2
- Test fuel pressure and volume
- Inspect intake manifold gasket
- Test individual injector flow rates
Repair Notes
Repair vacuum leaks or fuel delivery issues on Bank 2 side.
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
P1085 on Other Vehicles
Common Questions
What does code P1085 mean on a 1992-1998 BMW 318i E36?
P1085 stands for "Fuel Control Mixture Lean Bank 2". The DME detected a lean fuel mixture condition on Bank 2 beyond the correction capability of the long-term fuel trim. This often accompanies P1083 on V-configuration engines but can appear independently on Bank 2.
What are the symptoms of P1085 on a BMW 318i E36?
Common symptoms of P1085 include: Check Engine Light, Rough idle, Lean misfire under load, Hesitation, Poor fuel economy.
What causes P1085 on a 1992-1998 BMW 318i E36?
Common causes of P1085 include: Vacuum leak on Bank 2 intake side, Weak or clogged fuel injectors Bank 2, Low fuel pressure, Faulty MAF sensor, Intake manifold gasket leak Bank 2.