# Air Filter 2004 Buick Century **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [November 4, 2008, 12:50am UTC](https://community.cartalk.com/t/air-filter-2004-buick-century/21617 "2008-11-04T00:50:41Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![motormonkey](https://avatars.discourse-cdn.com/v4/letter/m/ed8c4c/32.png) [@motormonkey](https://community.cartalk.com/u/motormonkey)\ **Post date:** [November 4, 2008, 12:50am UTC](https://community.cartalk.com/t/air-filter-2004-buick-century/21617/1 "2008-11-04T00:50:41Z")
I just changed my air filter for my engine on my 2004 Buick century. Talk about a pain in the ass! Anyway I unplug a electric circuit, that snapped on and off, that is connected close to the air filter(don’t know the proper name for it). When I replaced the air filter, i drove the car by mistake before reconnecting that electric plug. Now I have the “service your engine soon” light on. Is this related to my “expert” mechanics job on the air filter? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [November 4, 2008, 12:54am UTC](https://community.cartalk.com/t/air-filter-2004-buick-century/21617/2 "2008-11-04T00:54:54Z")
You forgot to plug the Mass Air Flow sensor back in. And this will most certainly turn on the Check Engine light. But don’t worry. Drive the car for a while and the Check Engine light will turn off. Tester ---
**Author:** ![BarryNNJ](https://avatars.discourse-cdn.com/v4/letter/b/bbe5ce/32.png) [@BarryNNJ](https://community.cartalk.com/u/BarryNNJ)\ **Post date:** [November 4, 2008, 1:04am UTC](https://community.cartalk.com/t/air-filter-2004-buick-century/21617/3 "2008-11-04T01:04:58Z")
(Of course, Tester assumes you’re going to plug the MAF sensor back in, which you should.)