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203 gs300 code# P0430; catalytic malfunction

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Old 11-03-12, 12:49 PM   #1
viprtwo
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Default 203 gs300 code# P0430; catalytic malfunction

hey guys my friend is getting a cel code p0430 catalytic converter malfunction on bank one.

An independent shop is quoting him $1150 including labor to replace the cat..

I'm not sure if that means replacing the entire manifold or just the car.

is this a good price or could something else be causing that code to throw?

Any help is really appreciated.

Thank you!
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Old 11-04-12, 06:46 AM   #2
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Replace 02 sensors first!!!! Then, if you're still getting code then replace with an aftermarket cat. They are MUCH cheaper than stock.
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Old 11-04-12, 07:26 AM   #3
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Codes don't tell you what part to replace, they are a troubleshooting aid to help determine what the actual problem is.

Has the gas mileage decrease significantly, how about acceleration? How many miles are on the car, and what does the exhaust smell like?
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Old 11-04-12, 07:33 AM   #4
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Quote:
Originally Posted by viprtwo View Post
hey guys my friend is getting a cel code p0430 catalytic converter malfunction on bank one.

Thank you!
PO430 is bank 2, this location is the sensor on the midpipe, under the passenger seat.
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Old 11-04-12, 08:53 AM   #5
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Like 99_GS3 said. Unless you're smelling rotten eggs from your exhaust and crappy gas mileage then your cat is still good. It's prolly one of your O2 Sensors then.
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Old 11-05-12, 05:04 AM   #6
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If the exhaust gas is not smelling like rotten egg it could be the midpipe exhaust gasket. That was the problem with mine. Have your friend change out the 2 donut gaskets in the midpipe section of the exhaust. You can get the gasket from the dealer or Autozone for about $12.00 for the set.
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Old 03-27-14, 04:25 PM   #7
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I have a 2006 GS430 with 90000mi.
I have the same code. Exhause doesn't smell like anything bad.
I MAY have power loss but I haven't pushed the car hard.
I guess I will do a scan on the O2 sensors and see which ones values are fluctuating
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Old 03-27-14, 04:25 PM
 
 
 
 
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200, 2001, 2007, 300, 33, 430, 430p, cat, code, codes, eff, es, gs, gs300code, gx, lexus, ls, p0430, rx350, sale

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