P2579

What it means

Turbo speed sensor A is electrically intact, but the speed reading does not match the model — for example a speed that does not climb when boost rises, drifts away from the air-mass-flow estimate, or jumps. Often blade-fouling, a contaminated sensor tip or aged element.

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Oil-contaminated sensor tip

  high

  One of the most commonly reported causes for this code — check this first.

• Aged Hall element

  medium

  A plausible cause — test and verify before replacing parts.

• Sensor element aged beyond calibration window

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P2579 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?