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P2073

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

At idle, the relationship between MAP/MAF and throttle position does not match the calibrated map — typically a vacuum leak, dirty MAF, sticking throttle plate, or sensor drift.

  • 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.

  • Vacuum leak — cracked hose, gasket, or PCVCommon
  • MAF sensor contaminatedPossible
  • Carbon buildup at throttle platePossible

Parts involved

  • Manifold Absolute Pressure Sensor
  • Mass Air Flow Sensor
  • Throttle Position Sensor
  • Intake Manifold

P2073 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.