Long Term Fuel Trim Mixture Too Lean
2015-2021 Kia Sedona 3.3L V6
Description
The PCM has detected that the long-term fuel trim is correcting excessively in the rich direction, indicating the engine is running too lean. The fuel system is consistently delivering less fuel than needed.
Symptoms
- Check Engine Light
- Rough idle
- Hesitation on acceleration
- Poor performance
- Possible misfires
Common Causes
- Vacuum leak in intake system
- Low fuel pressure (weak pump or clogged filter)
- Dirty or failing MAF sensor
- Exhaust leak before O2 sensor
- Clogged fuel injectors
Diagnostic Steps
- Check long-term fuel trim values (excessively positive indicates lean correction)
- Perform smoke test for vacuum leaks
- Check fuel pressure under load
- Clean or test MAF sensor
- Check for exhaust leaks
Repair Notes
Repair vacuum leaks or fuel delivery issues causing the lean condition.
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
P1124 on Other Vehicles
Common Questions
What does code P1124 mean on a 2015-2021 Kia Sedona?
P1124 stands for "Long Term Fuel Trim Mixture Too Lean". The PCM has detected that the long-term fuel trim is correcting excessively in the rich direction, indicating the engine is running too lean. The fuel system is consistently delivering less fuel than needed.
What are the symptoms of P1124 on a Kia Sedona?
Common symptoms of P1124 include: Check Engine Light, Rough idle, Hesitation on acceleration, Poor performance, Possible misfires.
What causes P1124 on a 2015-2021 Kia Sedona?
Common causes of P1124 include: Vacuum leak in intake system, Low fuel pressure (weak pump or clogged filter), Dirty or failing MAF sensor, Exhaust leak before O2 sensor, Clogged fuel injectors.