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Possible Locations
My "Boost Sensor" is giving me hell and I'm looking to replace mine too. This layout is pretty generic, but may be off for your vehicle. The "Boost Sensor" that you speak of is probably the EVAP Pressure Sensor. It should have three wires or plugs (Red, White, Green if I remember right) and a single plasic nipple for a vacuum/pressure hose, about a quater inch in diameter. Now to confirm that your pressure sensor is too blame for any problems, your "Service Light" may have come on. The code that most closely relates to this sensor failing is P0450, retrievable by putting the ECM into diagnostic mode, or scanning from a local auto shop (I hear that autozone will do it for you now).
The EVAP canister is generally located under the car behind the rear left wheel, sometimes it is on the left. There are several sensors and solenoids associated with the EVAP system. In my case, there are 5.
Since this part is part of the Auxilary Emissions control, it is under a warranty by law. If any part involved with emissions fails in the first 50,000 miles of a vehicles operation it is the manufactuers responsibility to replace that part. I'm not sure if the age of the vehicle matters.
To replace the sensor, or any part of the EVAP system, you will need to relieve pressure in the system. This can be done by opening the gas cap, or using the Schrader valve in the engine compartment marked EVAP service port. Once pressure is relieved you should be able to swap the components. In my experience, under chassis machine screws tend to break easily, so it might be handy to have another way to secure the parts.
(In case you're wondering, I have a second generation Altima, although I believe the chassis is first gen.)
Hope that helps.
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05-31-2002, 12:33 AM
where exactly are Boost sensor and Evap. canister control valve?
