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Check engine Light trouble
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Sjacket01
Anonymous Poster
sjacket01@yahoo.com
Mar 4, 2009, 10:02 AM
Post #1 of 5
(2620 views)
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Check engine Light trouble
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My check engine light came on so I took it to Autozone to get it checked and they can't find the plugin of the check engine scanner. Any help is appreciated.
2001 Hyundai Sonata
4 cylinder
80k miles
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Double J
Veteran
/ Moderator
Mar 4, 2009, 10:07 AM
Post #2 of 5
(2614 views)
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Re: Check engine Light trouble
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Show 'em this.
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Guest
Anonymous Poster
Mar 4, 2009, 10:50 AM
Post #3 of 5
(2610 views)
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Re: Check engine Light trouble
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I found and showed them where it was thanks.
I got the codes P0304 and P0421. The print out they gave me didn't even list hyundai. Any ideas what those could be?
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Double J
Veteran
/ Moderator
Mar 4, 2009, 12:13 PM
Post #4 of 5
(2600 views)
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Re: Check engine Light trouble
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P0304 is a misfire detected on number 4 cylinder
P0421 is a oxygen sensor code (Rear sensor)
Find and correct the engine misfire code first.(A must)
May take care of the 02 sensor code.
Possible causes of the second code are a faulty 02 sensor (Rear),faulty catalytic converter ,Engine control module(ECM),exhaust leaks,Engine misfires......Get the idea...
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sjacket01
Anonymous Poster
sjacket01@yahoo.com
Mar 25, 2009, 4:19 AM
Post #5 of 5
(2568 views)
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Re: Check engine Light trouble
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Replaced spark plugs and 304 error was fixed.
Replaced catalytic converter and it fixed the problem I was having but check engine lght came on again with same 421 code. I'm guessing it's the O2 sensor now.
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