Problems with Camshaft Sensor on a 98 Ford Escort ZX2 2.0L zetec engine.?

I am trying to fix my friends car for her. I took the car to autozone to have them pull the computer code and it came back camshaft sensor. So we bought one and went to put it in and noticed that it is slightly off in size from the original. However I was able to get it back into place, but it didn't make any difference. So is it because of the difference in size or is there some other problem?
 
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