Code
P1071
BMW fuel trim
Adaptation sonde — Rangée 1 (BMW)
BMW : l’adaptation de carburant rangée 1 est hors plage.
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Most likely causes
- Fuite de vide
- MAF encrassé
Symptoms you may notice
- Check engine light
- Rough idle
- Poor economy
Checks to run
- Smoke-test the intake
- Check fuel trims
- Test O2 sensors
Tools you may need
Smoke machine
OBD-II scanner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.