Check engine light on?

2004 HYUNDAI SONATA
160,000 MILES • 2.7L • V6 • 4WD • AUTOMATIC
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HONG LUC
  • MEMBER
  • 1 POST
I changed the o2 sensor and the catalytic converter. After I have done all that my check engine light is still on. Can someone tell me what the problem is so I can take it to smog test?

Thanks
Jul 25, 2023 at 3:21 PM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,308 POSTS
You need to have it scanned in order to retrieve the trouble code that is turning the light on. There are many things that can turn the light on that are not related to those parts. Without the code as a starting point you could actually replace the engine, and still have a light from something in the transmission or fuel system.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Jul 25, 2023 at 11:27 PM
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