P0174
System Too Lean Bank 2
1999-2000 BMW 323i E46 2.5L I6 🇬🇧
High SeverityPowertrain
Description
The long-term fuel trim for Bank 2 has exceeded the positive limit, indicating lean running on Bank 2.
Symptoms
- Check Engine Light
- Rough idle
- Hesitation
- Possible misfires
Common Causes
- Vacuum leak Bank 2 side
- Low fuel pressure
- Faulty MAF sensor
- Exhaust leak Bank 2
- Clogged injector Bank 2
Diagnostic Steps
- Check fuel trim Bank 2
- Smoke test Bank 2 intake
- Test fuel pressure
- Test MAF sensor
- Check for exhaust leaks Bank 2
Repair Notes
Same diagnostic approach as P0171 but focused on Bank 2.
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
P0174 on Other Vehicles
Common Questions
What does code P0174 mean on a 1999-2000 BMW 323i E46?
P0174 stands for "System Too Lean Bank 2". The long-term fuel trim for Bank 2 has exceeded the positive limit, indicating lean running on Bank 2.
What are the symptoms of P0174 on a BMW 323i E46?
Common symptoms of P0174 include: Check Engine Light, Rough idle, Hesitation, Possible misfires.
What causes P0174 on a 1999-2000 BMW 323i E46?
Common causes of P0174 include: Vacuum leak Bank 2 side, Low fuel pressure, Faulty MAF sensor, Exhaust leak Bank 2, Clogged injector Bank 2.