Question about 1999 Hyundai Sonata

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My engine light has come on in my HG 2003 Hyaundai. I went to have the code read, and it stated warm up calistic below thrust hold needs to be replaced. CODE PO431. Please help. I a, a female and know little about cars. Also do not make very much money. So far I have not tried to repair anything yet. Just need some avice. THANKS VERY MUCH

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I am very sorry to hear you are having this issue. The problem is that you have a plugged or partially plugged catalytic converter. The Catalytic converter is located in the exhaust system generally just after the exhaust leaves the engine. The converter is full of little balls made of palladium, titanium, and other medals. If uses these metals to hold some heat in the exhaust system and help burn off excess hydrocarbons. IT is a federally required emissions part so removing it is against the law. I would suggest that you go to a reputable exhaust dealer like Midas, or Car X and have them test the converter and replace it. This is a expensive repair, priced at Napa the original replacements are $460.00 each X 2. So it would be wise to have a muffler shop diagnose which one is the issue.

Posted on Aug 03, 2010

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It's hard to find these small leaks. If you have a vacuum pump, there are a few tests you can run on the components of the system. See below.


TESTING

Vapor Canister
See Figure 1

  1. Apply a length of hose to the lower tube of the purge valve assembly and attempt to blow air through it. There should be little or no air should passing into the canister.

If the canister is equipped with a constant purge hole, a small amount of air will pass into the canister.
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jturcotte_228.gif

Fig. Fig. 1: Cross-section of the vapor canister


Fuel Tank Pressure Control Valve

  1. Attach a length of hose to the tank side of the valve assembly and try to blow air through it. Little or no air should pass into the canister.
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Thermostatic Vacuum Switch
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purge valve location:

jturcotte_229.gif


EVAP vacuum switch pic:

jturcotte_230.gif

EVAP system diagram:
jturcotte_231.gif

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