I took my battery out because im moving my cold air to go underneath it, and i found a lone sensor not connected to anything. What could it possibly go to? I discovered my check engine light is on, which it hasnt EVER been on since 1999. Anyone know what this is for? Here's some pics.

[IMG]local://upfiles/58535/9FCD5888D6CA463486976C695CD6745C.jpg[/IMG]

[IMG]local://upfiles/58535/B6696E810A6648DE87CDDCF78343F890.jpg[/IMG]

[IMG]local://upfiles/58535/CBAE1C36DA194E07B35F7264065F9221.jpg[/IMG]

[IMG]local://upfiles/58535/83FE2D1C54834E26A0964CFB681EC89C.jpg[/IMG]

Isnt that the battery temp sensor or something?

Ya probably, that sounds about right. Was just curious what exactly it did, and what the purpose of it was. Haha thanks.

it goes to a hole in the side or bottomof the battery tray.

You would be correct sir!

Out of curiosity why is there a temp sensor for the battery, ?

The battery temperature sensor is used to determine the battery temperature. This temperature data, along with data from monitored line voltage, is used by the PCM to vary the battery charging rate. System voltage will be higher at colder temperatures and is gradually reduced at warmer temperatures.

That's interesting, I really thought it was just there for looks honestly. But it makes sense now I didn't figure temperature would really affect a batterie's performance, but I learn something new everyday on here.