# Check Engine Light

**URL:** <https://community.cartalk.com/t/check-engine-light/30156>\
**Category:** Maintenance/Repairs\
**Created:** [May 7, 2009, 5:19am UTC](https://community.cartalk.com/t/check-engine-light/30156 "2009-05-07T05:19:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Schoff04](https://avatars.discourse-cdn.com/v4/letter/s/96bed5/32.png) [@Schoff04](https://community.cartalk.com/u/Schoff04)\
**Post date:** [May 7, 2009, 5:19am UTC](https://community.cartalk.com/t/check-engine-light/30156/1 "2009-05-07T05:19:03Z")

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I have an 03 Mustang GT. I picked the car up used from a dealer. Little did i know i bought a car full of problems. Come to find our the owner before me had a supercharger on it, and once he traded it, he took it off and went back to stock engine. I have had a “Cylinder 3 misfire detected” code on since about the time i bought it. I have replaced spark plugs, fuel injector, moved the coil pack to see if the code followed the coil pack, and i have had compression and air leak tests run and it was perfectly fine. I still do not know why the light would be one…the car runs perfect…

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [May 7, 2009, 11:37am UTC](https://community.cartalk.com/t/check-engine-light/30156/2 "2009-05-07T11:37:09Z")

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You might try swapping the crankshaft and/or camshaft position sensors.