Running rich P219A - MAP Sensor or something else?

[q45inca]

Hi, new to me 2016 QX80 with 150k miles is running rich. The exhaust pipe inside is black not gray. Fuel economy is bad in my opinion, about 9pmg city, 14-16mpg gentle highway driving. Where is the 20mpg specs claim? What do people get? Power is good, but feels like it's missing or misfiring sometimes. New engine oil/filter and air filter. Spark plugs look good. No blue/oil smoke and not much of a smoke in general, just too much fuel burnt.

O2 sensors appear to respond correctly, Long Term Fuel trim is too high (e.g. 28% bank2 , bank1 is ok), intake manifold absolute pressure is constant and too low at 0.29 PSI (does not change at all). MAF sensor appears to respond ok to the throttle, about 6 g/s at idle and 20 g/s blip on throttle. Everything else looks good on a computer, except occasional error P219A Air Fuel Ratio Imbalance Bank 1

So my first guess was a bad intake manifold pressure sensor. I've bought 2016 Infiniti QX80 MAP Sensor at partsgeek.com , Beck Arnley SKU 158-1705

Looks like this:

sensor.jpg (2.52 KiB) Viewed 3268 times

1. Is it a right part and if so, where does it fit? I can't find anything like that under the hood

2. What else should be checked or fixed or replaced in a case like that?

thanks a lot!

[q45inca]

To answer myself: RTFM

The manual shows the same looking part and says as below. And the sensor is actually at the very back of the manifold, that's why I could not find it. Still a question, anything else to check apart from replacing this sensor? thanks

Manifold Absolute Pressure Sensor
The manifold absolute pressure (MAP) sensor is installed on the
intake manifold collector. Detects intake manifold pressure, and
transmits a voltage signal to the ECM.
The sensor uses a silicon diaphragm which is sensitive to the
change in pressure. As the pressure increases, the voltage rises.

[q45inca]

Bad news, there is no sensor there in 2016 and newer, it ended in 2015. So either the sensor is elsewhere (where?) or it was discontinued in 2016 and simply no longer exists.

Back to the starting point. Thoughts?

[VStar650CL]

Have you tried cleaning the Throttle Body and doing an IAVL on the MAF? First things first, and when you have an induction issue on a Nissan (any Nissan), that's first.

[q45inca]

Not yet. A very good thought, I'll do it next, thanks for the advice!

[VStar650CL]