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I have a recurring CEL I have been trying to troubleshoot without success. The car is an '07 turbo, stock engine and exhaust, but I am told it previously had a protomotive tune (now supposed to be stock software). It drives perfectly, no hesitation or mis-fire, but the CEL that appears every 3-5 drives after reset. So far, the right side O2 sensors (leading and trailing) and MAF have been replaced in the past couple of months. Recently, this was the status before I reset the light: --- P2099 Post Catalyst Fuel Trim System Too Rich Bank 2 P2272 O2 Sensor Signal Stuck Lean