Two codes one problem

[Babalu]

Ok fixed the overheating issue with a. New waterpump and low temp thermostat I replaced the aos because of the vacuum coming from the oil fill pipe everything fine except the hesitation when I step on the gas two codes illuminated the cel one o2 sensor stuck open bank two sensor second code can’t read data from powertrain control module wich explains the car staying in second gear too long I don’t see these modules for sale or is it called something else from my understanding is theees one up front and one in the trunk of the car has any experienced this should I start by changing the sensor see what happens wich sent cheap 200 oem not sure if the module is faulty or could the vacuum leak set both of these off ?? Lil help I would greatly appreciate thanks

[83 944]

Vacuum leak will create that fault, also open circuit usually means A sensor failed open Circuit or along the way to the DME open circuit. Vacuum leak will lean the car out. Check your Short term long term fuel trims and 02 switching upstream down stream, maf data etc

If you had an AOs failure the plugs could have oil fouled as well

[Babalu]

changed plugs got a new 02 sensor thank you pelican parts you guys have helped me out alot so once i replaced 02 sensor cel went out flat spot went away car ran great bout a week later cel comes on checked code it was p0431 saying something about warm up post cat i replaced all o2 sensors the recent one i mjust purchased was not one of those but went with bosch on all sensors is the cat going bad or should i try a 02 bung car runs fine i think maybe burning a lil more fuel than usual but i have been on the pedal a lil or try another sensor or should i try to map this thing by a shop maybe they can adjust fuel ratio was thinking of going with comp plenium wich it would need to be mapped right after?? any thoughts