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The vapor pressure sensor is attached to the charcoal canister via 2 screw and a tube. there is also an electrical plug that goes to the computer.

other possible causes would be

The canister itself- either physical damage or fuel damage(causes by topping off your tank)

the air filter in the evap system

physical damage to the tubing or poor connections ( an evap smoke test will answer those questions)

a wiring problem ( an open or a short)

or the computer itself is bad.

Diagnosing these problems is difficult for the "at home mechanic" to do. this is a tricky spot that may be left to the pro's.

I am not a mechainic for a living but i worked on my truck for a P0450 Nissan code at it was very difficult isolating equipment to diagnose the situation.

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Q: How to fix a Nissan evaporative emission system pressure sensorswitch P0450?
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