Question about Jeep Grand Cherokee

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Replaced O2 sensors and those codes are taken care of. Check engine light comes on and using hand held scanner code 1494 comes up. Can not pass inspection. Any answers?

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  • Frank Meert Mar 14, 2011

    year modeland engine size please



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The code refers to the leak detection pump that is part of the gasoline vapor control system which is for pollution minimization. It says either that the pump switch or mechanical operation is faulty. According to a Chrysler manual I have, you would find the pump, probably on the underside of the vehicle by tracing the hoses related to the vapor recovery tank that may be in the right front corner of the engine compartment (I don't know Jeep designs) and then check to see if the pump starts when you turn the ignition to the run position when the vehicle is cold. Then remove the vacuum hose side of the pump and see if it draws a vacuum. If it does, then the vacuum-detecting switch that detects that the pump operation is OK may be faulty. If the pump doesn't start or doesn't draw a vacuum then the power to the pump, the pump itself, or the vacuum line may be leaky. Finally, the powertrain controller could be at fault.

In any case, that is where the issue is, and it should not be a major issue if it is handled by a knowledgeable mechanic. But you could check it over yourself if you are so inclined.

Posted on Mar 14, 2011


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First, inspect the exhaust manifold. If there are any cracks present then you need to replace the manifold and gaskets, as well as the sensor. VERY common with Accents.

If the manifold has no cracks then continue on.

Run the car until it's at normal operating temperature then shut it off.

Using an o2 sensor socket and a ratchet with extension (all very cheap at auto parts stores) remove the o2 sensor. If it begins to turn hard on removal then stop and put it back in, you will need an exhaust manifold. You can take the plug off easy by using a flat head screwdriver to press the button that holds the plug together and wiggling the plug at the same time. Otherwise, put the new sensor in being careful to NOT TOUCH IT TO ANYTHING!

If the tip of the sensor contacts your skin, or anything else that has oils on it, the sensor will be rendered useless and you will have a check engine light.

Tighten the sensor down, plug it in. Drive to your local auto parts store and have them clear the code in the computer with their hand held scanner. This is usually free. If you did ok, you won't have a light come on and you will enjoy better gas mileage. If the light comes back on in a day or two then you messed something up or there was a crack in the manifold that you didn't catch.

Good luck!

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