2003 mazda MPV check engine p0037
 

I am trying to help a friend who has a 2003 Mazda MPV. She got a check engine light so I took a look at the codes with
my code reader. I got a poo37 when the I checked the codes. I used baby Hueys picture to identify the part and replaced it.
I then tried again and I still get a poo37 code. I am kind of wondering where do I look next. Her car runs just fine except for
the p0037 setting the cel on. Oh by the way Baby huey I used your pictures to fix her stuck key problem. I must say you
have saved this poor lady a lot of money. I put in a switch months ago and it worked great. With her current problem
I wonder if I could have replaced the wrong sensor or If I have to do more looking. Any help would be much appreciated.
Thanks a bunch for any help.