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Noise from bypass valve

Symptom: Noise from bypass valve. Defective valve.

Noise from bypass valve

Fault symptoms

Noise from bypass valve.

Defective valve.

Conditions

The following conditions apply for this fault symptom:

A screeching sound can be heard on some cars when the diaphragm in the bypass valve oscillates.

Diagnostic procedure

A new bypass valve has been introduced. The diaphragm is weighted to prevent oscillation. Replace the defective bypass valve with a new one with part no. 44 41 895.