The enhanced diagnostics is an OBD Fusion in app purchase for $10, I bought it for my 2011 4Runner and my 2016 Highlander.

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I've read all of the comments here and watched the entire video, all of this is excellent information, however, I am a bit confused after reading some of the back and forth regarding whether or not to change the filter EVER or what interval to replace the filter... While I am very comfortable with tools and general repairs, mechanical maintenance on a vehicle is new to me (besides engine oil changes).

Here is my situation:
- I just bought a 2016 Trail Premium with 97K miles, drove it from CA to VA and crossed the 100K mark during the trip. It drove great, no issues whatsoever.
- The carfax shows that it was always serviced at dealerships by the previous two owners.
- Based on the fact that it is a '16 with 100K miles I am sure it was taken on many trips and the owners' commute must have been long (likely highway)
- In addition to the above, the previous owner had left their home address in the GPS address book and I googled it, they lived way out in the mountains and based off of the satellite images it looked like a lot of dirt road.

With that said, the maintenance records are scarce (besides the Carfax) and I am unsure of when the various fluids were last replaced. I had a trusted toyota mechanic give it a look over before the trip and he replaced the front rotors, brakes all around and did an oil change. Nothing else was noted other than the front struts must have been replaced within the last 20K miles with OEM.

Now that I am in VA, I'm starting to learn more and more about the maintenance of the vehicle and wanting to do all of my own servicing from here on out.

My questions:
1) Should I simply drain and fill the trans or should I go in and all in and replace the filter?
2) If you were in my shoes, what other fluids would you tackle right away? (rear/front diff, transfer case, etc?)

Any advice is greatly appreciated!
~smee

If it were me and I just bought it with 100K I’d personally do it all. I’d do the full trans service, diffs, t-case, brake fluid flush, fresh coolant, air filter, pollen filter, spark plugs, set the tire pressure in the spare because neither the pervious owner or their shop has ever actually checked that - no one does. The fact that your questioning it means you have your uncertainties about it. A known baseline reset and the piece of mind that it comes with it counts for something.

Thank you. I think that I knew this was the answer but just wanted someone else to say it so I didn't feel crazy. You're right about needing a baseline, I know I'll sleep better at night.... and I certainly intend to drive this vehicle into the ground.

Good note about the spare tire.

Looks like I have a lot of work to do and your video is going to be a life saver!

I am also utilizing the spreadsheet and info from this post for other servicing: Beginner Fluid Maintenance

I would add checking or replacing the serpentine belt and cleaning the MAF and throttle body. Both are cheap and easy to DIY.
My MAF and TB were pretty clean at 110k but looking online at vids, excessive dust and dirt could be a sign of air filter neglect or a lot of off-road use.

Good call. I picked up some MAF cleaner and TB cleaner while I was out today. Going to order the belt.

Edit: Just placed a hefty order through a local dealer... Tackling the ATF, Transfer Case, Rear/Front Diff first and a few other items:

I have the same app with the Toyota plug-in but can't find the trans temp. Is it one of the prebuilt sensors?

There’s a lot of talk on here about cost and availability of the OEM fluid for diffs and especially the T/C. Looks like you found a dealer willing to actually order and ship the liquid gold?

Also some talk on the serpentine belt: Toyota vs. “OEM” Bando.
If possible, could you post a pic of the belt you get from Toyota to compare?

You don't need a dongle, software, techstream, scanner or any other hardware to set fluid level in an A750E(2WD) or A750F(4WD) 4R 5th Gen /Tacoma 2nd Gen transmission.

All you need is a jumper wire and the instructions found on the first 2 pages of the following URL:

How to Drain/Refill Automatic Transmission | Tacoma World

Diagnostics-> PID values -> Menu -> Select PIDs -> Toyota, Lexus, Scion -> Engine and Electronic Controlled Transmission

Then select your values.

You don’t buy diagnostic ability for reading trans temp. You buy it for being able to read and clear faults from every control in the vehicle and we’ll as see diagnostic data and measured values of anything and everything. Seeing actual trans temp is just one of many many uses.

I agree, but some of the discussion in your fluid change thread centers around determining ATF fluid temp.
I was merely pointing out that Toyota's built-in jumper wire method addresses that.
Yes - scanners are useful for problem determination.

Well, I was able to place the order and get a confirmation of the order. I will report back if they contact me saying "we can't order this".

Ordered from: Toyota Parts and Accessories Online - DARCARS Toyota of Frederick in Frederick, MD

Damn. I didn't realize this. Yes I will post a pic once I receive it.

Great Video, thanks Agent O.

Watching this video made me think...can 5th gen ATF be changed like the 4th gen? There are videos for a complete ATF change using the 4th gens 4runners ATF pump. Basically, find the trans cooler input/output. Then run the engine to pump out 2 quarts, put in two new quarts of ATF and repeat about 6x.

I've always found the best Toyota WS deals on ebay. One of the better prices on there now is $104.99 for 12 qts. or $8.75 a qt. - free ship. Local dealer wants $13.00 a qt.

toyota Lexus Scion atf ws World Standard Transmission Fluid 12qts 00289-atfws | eBay