P1086moderate severityPowertrain
Fuel Control Mixture Rich Bank 2
on 1996 BMW M3 3.2L I6 S52 · RWD
What this code means
The DME detected a rich fuel mixture condition on Bank 2 that is beyond the adaptive fuel trim correction range. Fuel trims have reached their maximum negative adjustment limit.
Symptoms
- Check Engine Light
- Black smoke from exhaust
- Strong fuel odor
- Rough idle
- Reduced power
Common causes
- Leaking fuel injectors Bank 2
- Faulty O2 sensor Bank 2
- Fuel pressure too high
- EVAP system fault
- Crankcase vent valve stuck open
Diagnostic steps
- Monitor Bank 2 fuel trims
- Test O2 sensor Bank 2 response time
- Check fuel pressure with gauge
- Test EVAP purge valve
- Inspect CCV system
Repair notes
Diagnose and repair the root cause of excess fuel delivery on Bank 2.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1