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Code
P0174
Fuel / Air

System too lean — Bank 2

Bank 2 is running lean — fuel trims are adding fuel.

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Most likely causes

  1. Vacuum leak
  2. Clogged injectors
  3. Low fuel pressure
  4. MAF fault
  5. Exhaust leak

Symptoms you may notice

  • Check engine light
  • Rough idle
  • Hesitation
  • Higher consumption

Checks to run

  1. Smoke-test the intake
  2. Check fuel pressure
  3. Clean/test MAF
  4. Monitor fuel trims

Tools you may need

Smoke machine Fuel pressure gauge
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Fuel / Air

P0171

System too lean — Bank 1

 P0172

System too rich — Bank 1

 P1131

Oxygen sensor — bank 1, lean signal during closed loop

 P0175

System too rich — Bank 2
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