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Code

P1071

BMW fuel trim

O2 sensor adaptation — Bank 1

BMW: bank 1 fuel adaptation out of range.

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Most likely causes

Intake vacuum leak
Dirty MAF
O2 sensor aging
Fuel pressure

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.

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