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So at random times the CEL light will come on & i pull the same codes , just wanted to verify if it is what i THINK it is. P0140 02 sensor CKT no activity ( bank 1 sensor 2 ) , P0172 system too rich ( bank1 ) . I suspect the o2 sensor before the cat. converter but im not sure because i dont know what bank 1 sensor 2 means
BTW its a 2000 G20 A/T....am i right in my diagnosis?
TIA
 

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well there is only 1 bank on a inline 4 cyl motor. id say sensor 2 is the second sensor from the engine, however the after cat sensor doesnt usually control fuel emissions trim it only works as a emissions warning sensor. I could be wrong here. if this is the case then your correct your before cat sensor has failed, causing the car to go into fuel limp inorder to keep from running lean. so the after cat sensor is now throwing an emissions code too rich.
 
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