Emissions System warning keeps coming on. Mechanic & muffler shop disagree.

Question edited for clarity.
Question moved to model category.

You need it scanned with a pro grade scan tool.

https://www.google.com/search?q=2007+Acura+MDX.+SH-AWD+light+comes+on+solid

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the IMMO is bad
scan it, next if all fuse are good
the scan tool tell you why IMMO is not happy with DTC errors
is suggestion was dead on.
He is not CAR ASE tech, he is a locksmith.

If the car is new it may have been disabled to hide the location of the vehicle. That is the type of vehicle that is stolen in the US and Europe and shipped to Africa. They just busted a gang in Toronto Canada with 200 vehicles in a warehouse.

Or

The subscription to use the Navigation hasn't been paid or has lapsed.

Check the fuse for it.

Fuse Box Diagram Acura MDX (YD2; 2007-2013)

https://fuse-box.info > acura > acura-mdx-yd2-2007-20...

The interior fuse box is underneath the dashboard on the driver's side. To remove the fuse box lid, put your finger in the notch on the lid, pull it toward you, ...

Acura MDX (2007 - 2008) - fuse box diagram - Auto Genius

https://www.autogenius.info > acura-mdx-2007-fuse-bo...

May 28, 2017 - Acura MDX (2007 - 2008) - fuse box diagram · Primary under-hood fuse box · Secondary under-hood fuse box · Rear fuse box · Interior fuse box.

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sounds to me like a BAD CO2/Lambda Sensor Good Luck Mike L.

Exhaust and Emissions Auto Parts for your ACURA MDX

this may or may NOT help please let me know.

2001 Acura MDX Repair Problems Cost and Maintenance

P0400 Acura - Exhaust Gas Recirculation System Leak Detected

Hose, gasket, or egr has gone bad

I have a 2007 Acura MDX and its take forever for the air to get cold. Once it starts getting cold it work AMAZING, however waiting 20-30 minutes for the air to start is the WORST!

The full procedure how to reset oil service light Acura MDX. After an oil change, if you like to reset any maintenance oil light for Acura cars. Or any error which appears on the display.
http://resetservicelight.com/reset-oil-service-light-acura-mdx/

being an 07 your car is covered for all emmissions related problems for 8yrs 80k miles under warranty. recommend taking to acura dealer,so as to incur no cost to you

It may be the computer itself. If the light keeps returning, either the computer is faulty or the fans are really failing. I do not recommend dealers but actual mechanic shops.