Possible Causes
WARNING: This page is about a different car, the 2003 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set if by-pass valve does not operate properly. Possible causes are:
- Defective vacuum hose or line.
- Defective actuator.
- Defective by-pass valve.
- Defective front exhaust pipe.