# Service engine soon light is on

**URL:** <https://community.cartalk.com/t/service-engine-soon-light-is-on/55123>\
**Category:** Maintenance/Repairs\
**Tags:** f350, ford\
**Created:** [September 14, 2010, 5:03pm UTC](https://community.cartalk.com/t/service-engine-soon-light-is-on/55123 "2010-09-14T17:03:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![davidxray](https://avatars.discourse-cdn.com/v4/letter/d/d07c76/32.png) [@davidxray](https://community.cartalk.com/u/davidxray)\
**Post date:** [September 14, 2010, 5:03pm UTC](https://community.cartalk.com/t/service-engine-soon-light-is-on/55123/1 "2010-09-14T17:03:55Z")

</div>

My truck is giving me 2 codes PO676,PO683. I changed the #6 glowplug and relay. I cleared the computer and it’s still reading code PO676. How can I fix it.  
  
 it’s a 2001 ford f350 Diesel 7.3