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Check Engine Light - P0430

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Old 03-04-08, 08:06 PM
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Nosexnolex
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Post Check Engine Light - P0430
P0430

Catalyst efficiency below treshhold ( Bank 2 )

This is the error that came up on the scanner. Could this also effect my poor fuel milage? It went to 300 mptank from previous 400mpt. I hear some vibrations in the cat at idle as well sometimes.

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Thank you...
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Old 03-04-08, 08:52 PM
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I have the same problem. Let me know if you resolve this.
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Old 03-04-08, 09:34 PM
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Originally Posted by Nosexnolex
P0430

Catalyst efficiency below treshhold ( Bank 2 )

This is the error that came up on the scanner. Could this also effect my poor fuel milage? It went to 300 mptank from previous 400mpt. I hear some vibrations in the cat at idle as well sometimes.

Opinions?

Thank you...
check the o2 sensors i had the same code unfortunately i had already replaced the cats. and yes it could effect your gas mileage
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Old 03-04-08, 11:48 PM
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u went 400 mpt?! wow how many gal. do u pump up? because i only go 280 and i thought my gas milage was good already. btw i my mpg is 18 in the city
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Old 03-04-08, 11:50 PM
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Originally Posted by swat1727
u went 400 mpt?! wow how many gal. do u pump up? because i only go 280 and i thought my gas milage was good already. btw i my mpg is 18 in the city
you misread the post. i only get about 250 -270 per tank
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Old 03-05-08, 02:53 PM
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mpt as in miles per tank
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Old 03-05-08, 06:09 PM
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I agree with the O2 sensors as the most likely but it could also be a leak
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Old 03-05-08, 06:10 PM
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A leak in your exhaust system or your cat.
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Old 03-11-08, 12:29 AM
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how much did you pay to replace your cat
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Old 03-15-08, 05:10 PM
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Originally Posted by blkgs4wnav
how much did you pay to replace your cat
didn't buy one yet, or checked the car. too busy at this time.
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Old 03-15-08, 06:54 PM
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You should also have your 02 sensors checked out. They might need to be replaced.
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Old 03-25-08, 07:32 PM
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My 98 GS4 just threw the same code. Is this the pre or post O2 sensor?
car seems to run fine.
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Old 03-25-08, 07:37 PM
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This cat would be right under the driver side. P0430 means that you have a bad/blown cat.
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Old 03-25-08, 07:46 PM
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Code PO430 is for the cat or O2 on the pass side. It doesn't state pre or post.
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Old 03-25-08, 07:48 PM
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It's post =]
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