Evaporation and Condensation

My 97 pathfinder was taken in for a check engine test and was told it had a evaporation emissions control failure and a bad knock sensor can I fix these myself and if so how?


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2008-03-19 19:29:28
2008-03-19 19:29:28

im actually having the same problem right now, and i was told the sensor is under the intake manifold and both the upper and lower intake will have to be taken off.

The evap system is what takes the gas fumes from the fuel tank and sends it into the intake, usually the problem is with a vacuum hose dry rotting so check them all out , issues with the evap can be difficult to lock down and a smoke test might be needed. Purchase a Haynes or Chilton repair manual for your vehicle. it will take you through about all the DIY procedures step by step.


Related Questions

there is a emissions related failure on the vehicle.

No- Code P0440 is only an evaporative emissions failure and will not cause your car to use more gasoline. On the other hand having this code stored in your system will result in an emissions test failure.

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It means that the engine computer has detected an emissions related failure.

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P0440 OBDII code is for evaporative emissions control system failure.. check your gas cap though, many times a loose gas cap is the culprit with this code, hope this helps some1 out.

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No, it comes on when there is a failure that can affect the emissions of the vehicle. See related question below.

Any failure that can increase tailpipe emissions.

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Probably not as the emissions test (Smog test) is carried out by inserting a sensor into the exhaust pipe.

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