# CEL - codes P0300, 0303, 0035

**URL:** <https://community.cartalk.com/t/cel-codes-p0300-0303-0035/23214>\
**Category:** Maintenance/Repairs\
**Created:** [December 10, 2008, 6:10am UTC](https://community.cartalk.com/t/cel-codes-p0300-0303-0035/23214 "2008-12-10T06:10:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![giants](https://avatars.discourse-cdn.com/v4/letter/g/43a26b/32.png) [@giants](https://community.cartalk.com/u/giants)\
**Post date:** [December 10, 2008, 6:10am UTC](https://community.cartalk.com/t/cel-codes-p0300-0303-0035/23214/1 "2008-12-10T06:10:42Z")

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are these for faulty spark plugs? Thanks!

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**Author:** ![giants](https://avatars.discourse-cdn.com/v4/letter/g/43a26b/32.png) [@giants](https://community.cartalk.com/u/giants)\
**Post date:** [December 10, 2008, 6:12am UTC](https://community.cartalk.com/t/cel-codes-p0300-0303-0035/23214/2 "2008-12-10T06:12:22Z")

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sorry, last DTC is: P0305…

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [December 10, 2008, 12:40pm UTC](https://community.cartalk.com/t/cel-codes-p0300-0303-0035/23214/3 "2008-12-10T12:40:23Z")

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These DTC (Diagnostic Trouble Codes) are for misfire in general (P0300), #3 cylinder (P0303), and #5 (P0305) cylinder. Yes, replace the spark plugs, disconnect the battery for 2 minuets (to erase the codes), and give it a drive. If / when the check engine light comes on, read them again, and give us another “call”.