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Probably should have taken note on what code was listed. Whenever I get a CE light I grab my ELM327 bluetooth module and plug it into the OBDII port. Launch my Torque app and scan codes. Note the code listed and then clear codes.
My last CE light was P0172 and P0175 rich condition and happened also on a long 2500 mile trip halfway through it. Cleared the codes and it stayed away until I got back home and lit again. Looked at my long term fuel trims and they were -8 %. (once they hit +/- 10%, you trigger the CE light) Turned out to be a worn out, over reporting MAF sensor. Replaced it along with the original 2 pre catalyst O2 sensors and problem solved.
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