P3198. Coolant leak. Replaced components to no avail.

My thermostat went so i decided to change out the thermostat and water pump along with thermostat sensor. I get get the code P3198 and cannot figure out what it could be. Yes i plugged everything in. I reset the code but it comes back.

Sparkeh wrote

My thermostat went so i decided to change out the thermostat and water pump along with thermostat sensor. I get get the code P3198 and cannot figure out what it could be. Yes i plugged everything in. I reset the code but it comes back.

Hey Sparkeh, couldn't find the code in: https://my.obdcloud.com/dtc_codes/bmw

But quick search gives this: 2AF9 - P3198 https://www.m3post.com/forums/showpost.php?p=15900368&postcount=85

2AF9 however comes up in the Cloud (DCT code) with: "DME: Differential-pressure sensor, intake manifold, signal", or "Coolant temperature sensor".

Seems you have some fairly good leads and possible solutions there.