Check engine light with PO172 code
 

Hi all, yesterday I've changed complete throttle body with all sensors in my Spec C and fit Zerosport air intake pipe, car runs fine but after some time EML light come on when I pluged in computer and read the codes there was PO172 system too rich, I checked all connections, cleaned MAF and reset the ECU and so far EML gone, but didn't drive since. Any idea why the EML come on? I read that it may be 1st lambda sensor or MAF but is it possible that it may have something to od with throttle body which I changed or intake pipe? Thanks
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