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The other day I changed my coolant temp sensor with one from the junk yard cause the one I had on it, the plug would spin on the metal part. So I wasn't sure if it was reading right. Lastnight iwas driving home from work and at a red light my car started idling up and down like it will when the coolant was low. When I changed the sensor coolant came out and I never topped it back off. Then my check engine light came on. I looked at my coolant this morning before I went to work and it was full. When I got to work I checked the codes. 9 11 and 5. Which is engine coolant temp sensor iat sensor and knock signal. ...wtf? Just wondering if anyone has a ideal of where to look.