Question about 1999 Hyundai Sonata
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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Posted on Jan 02, 2017
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When the service engine soon light (Also called the check engine light) is turned on this is to alert you to the fact that powertrain control module (computer) has detected a failure somewhere in the systems it controls, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.
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See Figure 1
Fig. Fig. 1: Cross-section of the vapor canister
Fuel Tank Pressure Control Valve
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