Sorry to bring up a old thread Vadim, but my g20 lowport has been hesitating and it feels like it runs rich in the low rpm range but does great on the highway or revving it pat 3500 range too. Did you experience bad MPG? I think i saw you did....did it get better with the sensor?. My g kind of hiccups and sometimes even backfires then when the rpms get high enough it gets along well. Im thinking the person i bought the car from said it was throwing a knock code too. I was just wondering if yours was doing any kind of backfireing to see if the sensor will fix the issue. Also i did not see if you CEL was constant or intermitent? Thanks in advance