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GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

Error Codes...Please Help Po305/ Po300

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Old Apr 3, 2006 | 02:58 PM
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Default Error Codes...Please Help Po305/ Po300

My VSC, Vsc Off and engine light came on, i got it read and i got a whole bunch of codes coming back especially about a misfire on cylinder 5 and a few of the codes were PO300 Random Misfire & PO305 misfire #5

Does anyone have any info on this or know where i can get some at???

Thanks

P.s. I just replaced 2 of my O2's and changed spark plugs and wires.......

Last edited by Alexus-Kia; Apr 3, 2006 at 03:25 PM.
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Old Apr 3, 2006 | 03:28 PM
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Try sparkplugs.com. I got an oem o2 sensor for 98, came in 3-4days. NO Tax added.

Last edited by suge66; Apr 3, 2006 at 03:31 PM. Reason: wrong info
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Old Apr 3, 2006 | 03:29 PM
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Go to AutoZone gave them the cods and the info of your car like the year and the model of the car and they will tell you what are the cods about.
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Old Apr 3, 2006 | 03:37 PM
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Originally Posted by suge66
Try sparkplugs.com. I got an oem o2 sensor for 98, came in 3-4days. NO Tax added.
Well i'm all set on the O2s and sparks i have a slight rocking and roughness when driving ...so some of the codes are saying random misfire and cylinder 5 misfire....
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Old Apr 3, 2006 | 03:46 PM
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Did you put the wires on the right spark plugs? Sounds like a misplaced ign wire or the wire could be arcing on something (bad wire). Check all the wires and make sure they are on the right spark plug.
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Old Apr 3, 2006 | 04:10 PM
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Yes....The lights (engine, vsc) came on 2 days after i got the o2 sensors changed!

So today we changed all the sparks and wires thinking that would fix it......which it didnt so we are left at this point....All the other codes cleared except these 2.

The engine is slighty like rocking back and fourth...........

I have misfire in cylinder 1,3,5
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Old Apr 3, 2006 | 04:18 PM
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What brand o2 sensors did u install? Maybe an inferior product would not respond as good as factory. As a rule of thumb, you always back track if a problem arises. Since u changed the o2's I would relate the problem to that.
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Old Apr 3, 2006 | 04:52 PM
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it was the same brand that was taking out....
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