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Code

P1151

Ford fuel trim

Fuel system lean — HO2S bank 1 sensor 1

Ford generic: bank 1 runs lean.

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Most likely causes

Vacuum leak
Faulty O2 sensor
Fuel pressure low
MAF fault

Symptoms you may notice

Check engine light
Hesitation
Poor economy

Checks to run

Smoke-test the intake
Test fuel pressure
Check O2 switching

Tools you may need

Smoke machine Fuel pressure gauge

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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