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Do what I said in my first post unhook the vac line, plug it, clear the code and see if it comes back. Then report back.
O2 sensors don't last forever naturally. But the O2 sensor has nothing to do with this topic.
Ok, so salt rusts the butterfly mechanism so bypass valve sticks and sets p1436. So if you remove the mechanical arm on the bypass valve, so it...
Joedirte posted a picture of the vsv valve the sensor and hoses on the first page 3/4 of the way down. It is located by the engine dipstick tube....
Personally I removed the vacuum line coming from the tee of the VSV valve by the dipstick tube. This is the part I am thinking is the problem....
How does the 2002 Prius determine that the bypass valve is not opening or closing, there are no sensors in the three cat system for this? I will...
