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The one in the trunk area is the intake. The exhaust vent for the diff is on the top of diff . I ordered one of these back in 2016 to confirm it was an exhaust only diff valve using some vacuum tests. On the top of rear diff somewhere.. think I located it in the day but can't remember now...

21-5C1 in this schematic is reportedly the breather tube for AT https://www.zoomzoomnationparts.com/p/Mazda__CX-5/BREATHER-PIPE--BREATHER/105422307/FZ11215C1.html

Diff hose I used on mine shows as compatible to at least ‘25 CX-5 https://www.oemvehicleparts.com/oem-parts/mazda-differential-vent-hose-ke0227090a

Probably terminates in similar areas as the ‘13-‘16.5 models. Former member hear with a ‘14 CX-5 IIRC… lost his diff from water intrusion.. TSB was unknown at that time years back.. he thought a water crossing but I think it was from a car wash I change my front transfer and rear diff on 30k...

I was told in the past you had to double the percentage to get accurate distribution but maybe that is no longer the case

Anyone know where the diff vent terminates in the rear area of a 3 AWD? I wonder if there is a rare issue with a car wash that allows water in like the ‘13-‘16.5 CX-5 models? Reference...

You can view rear diff engagement as well. Forscan being discussed here but you can also view with OBD Fusion/Link. Be sure to double the value shown to see correct percentage of engagement. https://mazdas247.com/forum/t/2016-cx-5-awd-system-questions.123878840/post-6772708

It wasn’t hard to replace https://mazdas247.com/forum/t/cx-5-rear-diff-and-transfer-case-fluid-change-tools-parts-and-links.123850370/page-8#post-6745047

Mine seems fine but replacing my tensioner at 100k miles (~161k km) along with belts, hoses, coolant, and AT fluid/filter replacement.

0000-77-ECO7-QT https://www.mazdaswag.com/oem-parts/mazda-eco-7-gf-6-0w20-motor-oil-77eco7qt

My '13-'15 FSM shows it... I often lift at that spot swapping seasonal tires.

Here is one which could be caused by low flow through a filter. https://static.nhtsa.gov/odi/tsbs/2015/SB-10105639-2532.pdf

This TSB? https://static.nhtsa.gov/odi/tsbs/2018/MC-10134934-9999.pdf

Ordered some near 100k mile maintenance parts.. not many with free shipping still and local dealers don't seem willing to price match. Nothing wrong with current tensioner but just a matter of time...and making job easy on myself with a little less RTV to scrape on the AT pan. Ordered...

Reminder to ensure your ‘13-‘16.5 has this retrofit vent for the rear differential on AWD models to avoid potential water intrusion into rear differential. #RearDiffWaterIntrusion