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hello everyone, hope to find any clue to my problem that i am carrying for allmost 4 month now. i own a chevy sonic RS 1.4T year - 2014 with 138K KM on it. running it with trifecta perfomence tune for more than 3 years and never had any issues (PCV kit allready installed and working perfectly)...

Hello everyone. i own Sonic RS 14', lately noticed missfires/Sluggish accelerations/P0137 FAULT COD and decided first to replace the oxygen sensor before heading to the thoughts that something wrong with my catalitic converter. i ordered one from amazon but i am a bit confused since i have just...