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I had a resinator and muffler delete and added a high flow off-road cat the other day now my check engine light is on. I talked to Kia service and they said that its because I used aftermarket parts and it shouldn't cause any problems but they did say I won't know if anything goes wrong because the light is already on. I went back had the welds checked and they got my check engine light off but it came back on again this morning. Has anyone had this problem or can anyone help me out with some advise?
 

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2022 Kia K5 awd
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Alot of times adding a high flow cat or catless “test” pipe will throw a check engine light from the down stream (rear o2 sensor) normally have to have the rear o2 turned off or deleted via tune/tuner to get rede of the check engine light,

some people have had success using defoulers or o2 spacers but no clue if they have em for our cars
 
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