P2526

What it means

The vacuum reservoir pressure sensor is electrically intact, but the reading does not match the model — vacuum that does not build up after pump activation, does not bleed off when consumers draw, or stays at one value. Often a partly clogged hose, a leaking reservoir or an aged sensor.

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

• Leaking reservoir or vacuum line

  high

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

• Aged sensor with offset drift

  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 P2526 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?