Have not visited for couple years. My 2000 Disco II now has 153k miles. Couple months ago I have done Seafoam treatment, the most common via brake booster vacuum port on the intake manifold. After that I had check engine light come on. My code reader displayed following codes:

P1884 CAN Message - Certain Inputs / Outputs Out Of Range
P0102 Mass Air Flow Sensor Faulty, Drive Cycle A - Signal Out Of Range / Below Minimum
P0112 Intake Air Temperature Sensor 1 Circuit Low Input
P1590 ABS rough road signal circuit malfunction
P0130 O2 Circuit (Bank 1, Sensor 1)

I have reset the codes couple of times, however, all came back again.
Since I had a spare MAF sensor since about 2008 (OEM Land Rover) I figured I start with that. After replacement I have cleared the codes again and bingo. All DTC's cleared and have not reappeared again. Only P1590 is showing a unresolved issue, however, this does not trigger check engine light.

Just wanted to post this if it may someone with their MAF sensor issues diagnostics.
I have no clue regarding timing of this problem in association with the seafoam treatment, perhaps someone else have experienced similar problems. Could I have done something wrong? Maybe administering the seafoam too fast?

 

112 also is from the combo MAF/IAT sensor -

The IAT sensor signal must be less than -35°C (-31°F) for longer than 200 ms.

Not likely you are at this temp, but do you have connector seated fully on first sensor? Seafoam down stream has no easy way to contact the IAT...

 

I live in San Diego where temps are rarely below 40°F. I agree, the brake booster vacuum port is too far downstream for Seafoam to have contacted the MAF/IAT sensors. Still, it's puzzling what happened.