P1578
Brake Booster Vacuum Sensor Circuit Low Vacuum
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Increased brake pedal force
- Deterioration in braking performance
- Check Engine Light Is On
- Unstable engine operation at idle
- Noises when operating the brake booster
Causes
- Brake booster vacuum sensor malfunction
- Vacuum leak in the brake booster system
- Open or short circuit in the sensor circuit
- Vacuum pump malfunction
- Problems with the sensor wiring harness
How to Fix
- Check the continuity of the brake booster vacuum sensor circuit
- Check for vacuum leaks in the system
- Test the brake booster vacuum sensor
- Replace the vacuum sensor if necessary
- Check and, if necessary, replace the vacuum pump