Just finished up my 5.7 crate motor install with the MP harness and ECU.
Car starts and runs great, but I noticed a slightly rich exhaust smell like my old 340 when I pull in garage after driving, slight but there.
ECU is throwing the following codes, 4 of them are related to the 2 rear O2 sensors.
Factory cars come with 4 O2 sensors, this crate install only requires 2.
So I'm wondering why they didn't disable, and is the cause of the rich smell?
P0138, P0158: O2 sensor high voltage Bank 1 and 2, sensor 2
P0038, P0058: Heater control high, Bank 1 and 2, sensor 2

And P0443: Evaporative Emission Control system, purge control valve
I have this nipple capped, isn't this the "gas cap check" code?

Called the tech line and they had no idea, guy kept telling me I need to move the air filter to get cold air.

Anyone have a similar issue?