Had heads professionally rebuilt and shaved on my 2005. In the process I changed quite a few addition parts while I had it torn down. (Water pump, idler, belts, Knocks sensor, plugs, injectors, oil change, radiator flush..) Vehicle is running very well but i keep getting check engine light, triangle warning light and vtm4 light displayed. Bluedriver scanner comes up 171 and 174 - fuel system to lean banks one and 2. Any ideas???