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Estimator » Vacuum Leak Diagnosis

Vacuum Leak Diagnosis Cost




$88 to $111
National Average
Estimate includes:


Best Practices
  • When locating a vacuum leak, we recommend using a smoke machine to find all of the areas that are leaking. 

  • After all of the known vacuum leaks are repaired, we recommend performing a drive cycle test drive to verify that the air-to-fuel ratio has returned to normal.

Common Symptoms
  • When an engine has a vacuum leak, it may:

    1. Idle rough

    2. Be hard to start and/or keep running when cold

    3. Misfire

    4. Hesitate under acceleration

    5. Get poor fuel economy

  • The Check Engine Light may illuminate setting a P0171 or P0174 code, indicating that the fuel system is running too lean due to the vacuum leak. 

Common Misdiagnoses
  • Vacuum leak symptoms can be caused by a defective mass air flow sensor, ignition misfires, a defective idle air control motor, or a stuck-open EGR valve.