For the past year I have been dealing with this issue of getting the codes P0132 and P0152, I replaced both O2 sensors just to have the codes reappear a few days later. When the CEL is set and I pull the freeze frame data it's always the same thing, stft are -25 but ltft are at or slightly above 0. After i bought the car I did the motordyne plenum spacer , injen cai, injen exhaust, and berk hfcs. Shortly after I got a knock sensor code and had to replace the sensor and sub harness (which I learned from this forum, ty). When I pulled it all back apart I noticed my injectors where leaking a little as well as my valve cover so I replaced the valve cover gaskets and put in reman injectors, which turned out to either be defective or not the correct ones although they did a pear to be but I pretty much ended up with a or bunch of stuck injectors and had to pull them out and I out in verified working ones that had been cleaned. After some time the P0132 and 152 codes came back. Finally I have had time to look into it. Before the car is fully warmed up and under light throttle (1,500-2,500 rpms) the fuel trims go from +10 to -25 resulting in those codes and reduced power and stumbling. You can definitely smell raw fuel and there is carbon build up on the exhaust tips. After the car is full warmed up all issues go away completely until it cools off, then they return. I have been watching my O2 voltage which can spike to 1.3 on both upstream and remain at .28 downstream which rarely ever fluctuates. Today I installed 2 new downstream and still the same no fluctuations, I unplugged them and the torque app was still reading them at .28v so I reset the ecm and unplugged them again and still .28v, some times .27v. My understanding is they should be around .6-.8 with some minor fluctuations. At this point even sensor is working as they should except my O2 sensors here and there, this is not an everyday problem and can be a min to min issue which resolves quickly but almost always happens during warm up. I'm leaning towards a bad ecm, any input would be appreciated , ty.

 

Not likely a bad ECM as that only has inputs. Most common reasons for getting rich codes in both banks is engine knock with excessive oxygen commonly caused by low octane or fuel. When I worked at a Dodge dealer I've seen wiring issues causing both banks to read rich. Wires pinched going through firewall. Vacuum leak could possibly cause it also which is the easiest to test for. Starting fluid, spray it around your intake. Gaskets may not be sealing properly around spacer until engine warms up. Hope this helps. Let me know if you find a solution. These bugs always strike curiosity. lol