Put on a SLP lid and now I am thowing a po137 and po157 code. I know what the code means, what could be causing it, the lid?? I have been searching the board for 2 hours and cant find a answer. Any help would be appreciated!!

Thanks

 

It sounds like you need new rear o2 sensors if you are throwing these codes. I'm not sure how adding a lid caused these to go off. The rear sensors are just there to see if the cats are working. I guess if the lid really messed up your air/fuel ratio this could happen, but I havn't heard of it before. Hopefully someone with more experience will chime in.

 

clean the MAF.

 

I will try cleaning the MAF today. I did get on it a little bit trying to feel some difference with the new lid. Thanks!