I'm looking for help to check my limited knowledge of MAF Sensors and ECU's in my 2012 Land Rover LR4.

Issue: Between 40 - 50 mph (1600-2000 rpm) I experience some roughness; feels like lean air fuel ratio issue to diagnose.

Actions and Results:
1. I checked my GAP IID Tool for faults. None.
2. I cleaned the MAF sensors. No change.
3. I checked the MAF sensors diagnostics on my GAP IID Tool and found the voltage reading on MAF 1 is approximately 32V; I unplug the sensor and start the engine and the reading remains the same. MAF 2 goes between .7 and 2 depending on engine on/off/idle.

Assumption: Given that MAF 1 is being given a constant voltage of 32V (even when disconnected) and should range between 1 - 4v, I'm assuming I have an ECU issue?

If this is correct, any thoughts on a resolve are appreciated.

 

Hey did you ever get this resolved? I’m experiencing a similar issue with my 2014.

 

The PCV valve on passenger side valve cover is a known point for air leaks.

The PCM will keep trying to adapt for an air leak until it can’t anymore, then you will get a lean code.

You might notice a slight sucking noise coming from it and when you push on it that noise will change.