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2001 LS430 P0430 code & exhaust noise

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Old 04-10-14, 04:28 PM   #16
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This doesn't sound like a place I would want working on my Lexus. What did they suggest was the problem. Their work or a new area? Fixing a car and then delivering it with yet another problem seems a bit strange to me.
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Old 04-11-14, 08:08 AM   #17
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Hopefully the check engine light wont come on again. I've cleared my codes before, thinking the problem was fixed, only to see them come back the next day.
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Old 04-11-14, 08:45 PM   #18
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Did seem a little odd, but there is no engine light after multiple drives. They would have had to disconnect, and then reconnect, the two oxygen sensors, when they replaced the y-pipe, so maybe the computer had to have time to read all of the new information before it squared itself away, who knows.

The current status is no engine light, so everything is fine.

Thanks for all your support.
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Old 10-21-14, 06:34 AM   #19
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I got sick of seeing the check engine light on, so I took my car to the muffler shop. After reading this thread my assumption of an exhaust leak was confirmed. The muffler shop found a crack in the passenger side muffler around the second O2 sensor and welded it. It only cost me $20 and now I have no more check engine light.
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Old 10-22-14, 12:35 PM   #20
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My 2002 had a P0430, and there were two causes: 1) a small gasket leak at the front of the Y-pipe, 2) a small crack in the passenger side of the Y-pipe, directly underneath the very front of the heat shield.

Every LS430 over 10 years old and driven on salted roads will develop this problem. The heat shields, heat shield clamps, and exhaust pipe are made of different metals, which encourages galvanic corrosion.

The mild steel heat shield clamps are in close contact with the stainless steel heat shields. This + salt quickly rusts off the clamps and cause them to rattle against the pipe. Because the stainless heat shields are in close contact with the mild steel pipe, I believe this also encourages corrosion of the exhaust pipe. With the clamp loosened, it is even easier for salt water to get inside the stainless heat shields, which burns off, and then the remaining salt encourages rusting from the inside.

See thread at http://us.lexusownersclub.com/forums...0420-on-ls430/

If you catch the problem too late, it will cost you $300-600 to buy and install a new Y-pipe. Cheaper to catch the problem early when the muffler shop can still weld the crack. If the crack is too deep/big, it is usually not possible to weld. You can get a brand new pipe+catalyst for the essentially the same price as having a shop cut off the bad pipe, fabricate a replacement, and weld the replacement in.

Also, don't bother reattaching the heat shields unless you do a lot of offroading and driving over dry grass.
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