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Question:

What else can be causing my Check Engine light to come on?

I have a 1997 Plymouth Breeze with the 2.0 four cylinder engine. The light came on over the weekend and I took the car straight to Auto Zone for a scan of the OBD2 system. The only code that registered was P1494, I called the chysler dealership and they said it was a leak in the evap system. Most likely cause was a loose or missing gas cap. I checked for this, and even went to the expense of buying a new one. After the new cap was installed, I had the code erased. I reset my trip meter and drove about 90 miles and the light came back on. I‘ve had a mechanic check the lines and hoses running from the fuel tank to the charcoal canister and then to the engine. All were tight and in good shape. I was also told by the dealership that the leak detection pump might be bad. This is a small vacume pump that keeps a constant vacume to the evap system. My Haynes manual shows this pump, but my mechanic says there isn‘t one on my car. I‘m now being told the problem is my O2 sensors??????

Answer:

It's very possible that the O2 sensors are the problem. It seems that most of the time when a check engine light comes on, it's to indicate an environmental/anti-pollution system such as this.
Could be from gas cap loose or leaking, make sure you get a replacemet from Dodge after market cap isn't good enough. Far as leak in the line is very hard to detect where the leak is unless you use smoke machine. smoke machine leak smoke out of the trouble area. Far as leak detection pump might be sitting on the top of the tank. Is more than that p1494 just tell us canister system fault,pump,hoses,cap,solonoid etc.

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