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P2074

Manifold Absolute Pressure / Mass Air Flow - Throttle Position Correlation at Higher Load

At higher load, the relationship between MAP/MAF and throttle position does not match the calibrated map — typically a charge-air leak, restricted intake, or wide-open MAF underread.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: medium

Symptoms

  • Check engine light on
  • Power loss, hesitation under acceleration
  • Rough or unstable idle
  • Increased fuel consumption
  • Possible difficulty starting

Common causes

Ordered by how often each turns out to be the cause.

  • Charge-air pipe leak after turboCommon
  • MAF sensor contaminatedPossible
  • Air filter heavily restrictedLess likely

Parts involved

  • Manifold Absolute Pressure Sensor
  • Mass Air Flow Sensor
  • Charge Air Pipe
  • Intake Air Filter

P2074 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.