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Discussion Starter #1
hi I am new to this site i have an 03 sonata with a 2.4 auto just recently had the timing belt replaced it idles very poorly and jerky now i got two codes one saying low exaust and one saying cataletic converter malfunction i can get the nos. of the codes when my wife gets home if that helps... they're in the car. also the car has 90,000 miles thanks
 

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Yep, need exact P-xxxx codes to know where to go.
 

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Discussion Starter #4
i guess its just one code that could mean a couple different things its P0421 any help would be great thanks
 

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Could be the CAT is bad, or the downstream sensor on bank 1 is bad. When is the last time this thing had a tune up?
 

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PCM has determined Catalyst to be ineffective via the pre & post cat Ox sensor movement
 
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