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P1093Diesel & RV
Moderate

P1093 — Air-fuel mixture imbalance — adaptive trim at limit

Long-term fuel trims have hit their limit. The ECM can no longer compensate for a persistent offset—often an unfixed sensor or air leak.

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Likely causes

  • Undetected air leak at the intake manifold
  • Fouled injectors or uneven cylinder flow
  • MAF or MAP sensor out of calibration or failed

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Recommended checks

  1. 1

    Smoke-test or otherwise check the intake manifold for leaks

  2. 2

    Balance and clean the injectors

  3. 3

    Reset adaptations and watch cold-start fuel trims

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Parts to replace