The check engine light came on 2 days ago i hooked the scanner and got this P172 P175 which it says bank 1 and bank 2 running rich.I cleared the codes drove today and when i got home i put the scanner again and it said pending codes the same codes again but the check engine light wasnt on.Its 2004 ML350 and the engine runs and drives perfectly fine what could it be that its throwing this codes.
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