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Three weeks ago I installed the max power header,Helmholtz mid pipe and O2 extensions along with a Roadstersport 2 that I already had on my 2014 Club Edition. Install went great and I love the results. But after about 250 - 300 miles I got a P0137 code. Is this common and should I be worried. If anyone knows what I need to do to fix that would be great. I would like to get a Moto East tune but when I purchased the car I bought the extended warranty and I don't really want to completely void that just yet.
Never seen that code on install here, but my quick Google search says low voltage on rear sensor. So, I would start by checking wires into that rear sensor, make sure they are NOT pinched over at hard angle. Perhaps unplug and replug the extension cables to make sure good connections on those (and LOOK into the plugs and make sure pins are not yanked too far back in the plug, which can happen if during install the extension gets yanked on too hard).