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If your CEL keeps coming on, but it's throwing a 55 code, I would actually suggest taking it to the shop. There's something odd that's making your CEL come on. Mine came on once after I bogged the car one night, but was throwing a 55, and it never came back on after I reset it. Has this been happening since you replaced the O2 sensor or the MAF? Or was it happening before? It seems that maybe one of the parts you replaced needs to be adjusted or is possibly faulty, since you're commenting on bad gas mileage also.
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