29E2moderate severityPowertrain
Lambda Multiplicative Part-Load Adaptation Limit, Bank 1
on 2013 BMW 750i 4.4L V8 Twin-Turbo N63 · RWD
What this code means
The part-load (multiplicative) fuel trim has hit its correction limit on bank 1, meaning the mixture is too lean (OBD P0171). The ECU can no longer offset the air/fuel error at higher loads.
Symptoms
- Hesitation under load
- Check engine light
- Reduced power
Common causes
- Vacuum/intake air leak
- Faulty MAF sensor
- Low fuel pressure
- Dirty or clogged injectors
Diagnostic steps
- Read fuel trim values with scan tool
- Smoke test intake for leaks
- Check fuel pressure under load
- Inspect MAF sensor and injectors
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Other Powertrain codes on this vehicle
29CC
Misfire Cylinder 1
29CD
Misfire Cylinder 2
29CE
Misfire Cylinder 3
29CF
Misfire Cylinder 4
29D0
Misfire Cylinder 5
29D1
Misfire Cylinder 6
29D2
Misfire Cylinder 7
29E0
Lambda Additive/Idle Adaptation Limit, Bank 1
29E1
Lambda Additive/Idle Adaptation Limit, Bank 2
29E3
Lambda Multiplicative Part-Load Adaptation Limit, Bank 2