Can someone please offer input as to why Im throwing p0155 and p1153 after my kooks headers + no cats (no rear 02 sensors or sims, the connections are just "there") + dyno tune. Im trying to solve all issues so I can move on. Thanks.

 

well your p1153 may also get a p1133... just turn the freakers off.

its got to do something with the exhaust gases flowing by the oxygen sensor and headers with their bungs for oxygen sensors don't have them in the flow enough. BUT if you just turn the codes off your car will run no differently in any shape way or form.

the po155...looking it up now