p0172/p0175 codes

Question

I have changed the o2 sensors for all 4 o2 banks, upstream/down stream,,,the p0172 code resolved with the new sensors, for both upstream, and the 1 left downstream,,now the code p0175 is showing again on the right side bank 2,,,the EMC has been checked and cleaned along with the intake,,,,any suggestions?

Answer 1

P0175 Fuel trim Rich Bank 2

How the Sparkplugs on Bank 2 ? Along Bank 2 note any different sparkplug appearance for that particular cylinder, Fuel trim that are rich are mostly indication of a mechanical problem such as low compression , Even exhaust back pressure can cause rich running condition.