TORKO

P0558 Brake booster pressure sensor circuit high

What P0558 means

Many cars measure the vacuum in the brake booster so the engine computer can make sure there is enough assistance for the brake pedal. P0558 means the sensor voltage is above its normal range. The computer can no longer monitor booster vacuum, and start-stop may be disabled.

P0558 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.

At a glance

Severity
Medium
Typical repair cost
80–320 €
Workshop time
0.4–1.4 h
Repair difficulty
Easy
DIY possible
Yes
Check engine light
Yes
Affects emissions test
No

Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.

Symptoms

Common causes

  1. Faulty brake booster pressure sensor
  2. Open ground or signal wire shorted to voltage
  3. Corroded or loose sensor connector
  4. Disconnected or split vacuum hose at the sensor
  5. Faulty vacuum pump on some diesel or direct-injection engines

Can I keep driving with P0558?

You can drive, but check that the brake pedal feels normal. If the pedal is hard or braking takes more effort, stop driving and have it checked; otherwise get it repaired within one or two weeks.

What to check first

  1. Check how the brake pedal feels with the engine running
  2. Inspect the sensor connector and vacuum hose on the booster
  3. Check sensor supply, ground and signal voltage
  4. Replace the sensor if wiring and vacuum are good

Related codes

Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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