I have 2007 road king, HiFlow air filter, V&H oval slipons and Race tuner.
Ive been getting check engine light every once in awhile and when i check the codes; its been the same two that come up.... P1356 Rear cylinder no combustion and P0152 rear oxygen sensor high/running rich

Replaced the plugs and plug wires twice (each time with OEM) and codes keep coming back after a few hundred miles. I don't feel any loss of power but i do get some backfire when letting off the throttle at highway speeds. Do the codes keep coming back because its in the history?


What should i be looking for now?

Thanks in advance
Jay

 

Check your fuel line that's in the gas tank for pin holes.

https://www.hdforums.com/forum/touri...-on-ultra.html

 

I'll have to take a look at that!!!

 

Throw in a 1/2 bottle Fuel Injector cleaner next time you fill up and a cap full of Marvel Mystery Oil. And here is something new from Marvel Mystery Oil :
http://www.ebay.com/itm/like/1124405...983&rmvSB=true