Wrong parts replaced because of these scantools! 

And this is why I use Autel!! Woot woot! And yes this means Autel is better Dan! Jk'in I will give you some advice if using Autel on Chrysler EVAP systems. The advice is, don't use it. It displays the wrong switch status data for the NVLD and ESIM systems and will lead you to a faulty PCM. Has been this way for years. Real handy.... 😐

Sorry to LAUNCH user and Thanks to Dan. We will correct the fault as soon as possible. The issue already report to the software department and it will be update on next update. Thanks for support and we will do our best.

You know it's a Dan video when Dan knows it beter then the scantool itself. Great video (again)

i watch your videos for training purposes. your approaches are methodical and your ability to share your thoughts is perfect. thank you for another great video.

What a great intro Dan. Love your humility and willingness to admit a mistake and awesome that it wasn't your fault! I'm here on an autoplay btw :-) Seems google knew I'd like this video

It's nice to see how quick SnapOn made an update for this fault. Great video as ever, it's just amazing how many of the scan tools were wrong, so no surprise you were led down the wrong path

Fantastic, informative video, Dan! You always bring fantastic educational content in a manner that everyone can understand. Good luck with everything you have going on and congratulations on your continued success!

I saw many videos of others, But to be honest You teach smoothly and open, I appreciat u! Keep it that Dan!

This is one of the reasons I keep a different variety of scanners around in my shop! Great video Dan!

I just ran into this 2 weeks ago on a Honda using a Launch scanner. The scanner had banks 1 and 2 backwards. I didn't trust it, so I tried my Snap On. My suspicions were correct.

Excellent Dan. As always, your associative thinking and attention to detail is world leading.

Amazing difference. Thanks for posting this video Dan.

Great job Dan for the software bug discovery. This will prevent any more misdiagnoses in the field.

Great video and explanation on SCR/DOC/DPF system as well as the info on how you never know which tool brand will work on a given vehicle! Exactly why you can never have just one!

You are a genius!! Well done Dan!

Hi Dan, Thank you for the video clip and very interesting regarding the results and also being totally honest regarding your dilemma.

Great video Dan, i have actually experienced this myself, this time i was using the autel maxisys on a transit van and the tool miss identified the cylinder on which the glow plug was faulty

I recently dealt with something similar while working on my BMW 335d - I was getting intermittent check engine lights and the LAUNCH Scan Tool was giving DTCs for DPF pressure issues. Checked the data PIDs and noted that there were seemingly erroneous readings for the exhaust pressure sensor. Replaced it and it stayed exactly the same (It was showing like 120psi). Ended up utilizing ISTA+ which showed the correct data and led me to find a soot clogged differential pressure sensor hose.

Nice work Dan!

Another very clear video. Thanks Dan.

Great information as usual and with the added bonus of getting to learn how the ad-blue system works! (Where's the second thumbs up?)

Today it's scan tools with software flaws, a few months ago it was a Bosch engine speed sensor poorly enginnered!... Dan, your job is already hard enough as it is!... I can't imagine your frustation when you get these kind of findings in your shop!

I love LOVE love this video! Dan, bless you.

Thanks Dan !👍 lot of reactions on this topic i see. Personally i think It’s on of the most challenging systems to diagnose. You explained it really well how it works (my opinion even better then my master training at the Ford academy 😬😂) thanks again and keep it up 💪🏻👊🏻

This is as I see it an effect of an incorrect scaling for the PID in question and I assume that manufacturers of aftermarket scan tools only have a few sources for PID data where most goes back to the vehicle manufacturer. And even at vehicle manufacturers the scaling sometimes gets incorrect. The reason might even go back to a replacement of the sensor late in production where you had sensor A during development but changed to sensor B with a different resolution and then someone forgot to update the PID accordingly. It can be even more interesting if the build order for a vehicle lists the wrong part number. A friend of mine had one car with a MAF issue but it was revealed that the build order for that car listed the wrong MAF and the ECU just thought it was a faulty MAF, not the wrong one and did set the check engine light and throw a code about a bad MAF. Replacing the MAF gave the same incorrect MAF again until there was a mechanic able to discover that it was the wrong MAF. I wouldn't be surprised if that happens now and then, something to consider when you end up with a lemon with mystery issues.

Kinda looks like the other scan tools forgot a decimal point. 5263 ppm instead of 526.3 ppm

Fair play for sharing this information Dan, greatly appreciated 🙏

As always - excellent video. Used Snap On for years, altho' not on the newer models. Thanks Dan

Great content as usual! These (branded) scan tools are expensive and so can make you too trusting! Any tools that make extensive use of software/firmware can produce plausible errors

I really like my Autel--it sure would be nice to have a gas analyzer though-- many, many moons ago I used the gas analyzer to rejet carburetors on cammed engines--before your time sir--great video, thank you for your time.

Great video Dan as always. I just brought the Autel MS909. That was a relief for me after watching your video. Thanks 😊

I’ve been watching Ivan and paul and others for years. RU-vid just showed me your stuff today when I looked up to fix some things on my new to me Alpina. :) I’m watching all your vids. Love it!! And thank you!!

i wish my teachers in school could have explained things like you i would have been a better student

Thanks Dan for putting this out. I remember one buddy of mine asking me to look up the part number for the "sliding door switch" on a Mk1 Seat Leon since that was the component his china knockoff VAG CAN PRO flagged up as faulty in his convenience module. I know this is a silly example but some people really seem to trust whatever they get to plug into their OBD socket.

Another great video by Diagnose Dan. Thank you

Another great video.. Thanks for explaining SCR systems in greater detail 👍🏻

Hello Dan. Diagbox is a very complicated tool. Sometimes it lies too or does not have enough data PIDs. After workin 15 years with PSA it still amazes how complicated it has become with euro 6 engines Nox sensors Adblue readings and many more.

Good example of being careful about the data you read. Scan tools are helpful but sometimes you can get tricked. Working in a dealership I see a number of the early glitches. I primarily do transmission work and for me the glitchy functions of even the factory scan tools is a way of life. Often there are tests that I need to do the factory scan tool won't work and the Snap-On scanner I have does and vice versa. There are certain models of transmissions the Snap-On scanner is useless for certain functions and I have to use the factory scanner. You illustrate clearly here the need when you see something that is wildly out of spec, try another scanner. In your case maybe the third one would have been the charm. Good video Dan.

Great job as always Dan thanks for sharing!

Has happened to me a few times . Not only the wrong data but INCOMPLETE coverage of what they CLAIM they cover . You are a great teacher Dan , Thanks !

Awesome video Dan !! I have been waiting for you to end up doing a video like this. I have ran into the exact same problems in the past. For me it was the “Last Straw” for my Snap-On and I have been using Autel Pro since then. The factory tools are just way too expensive here in the US.

That cool van has a gear stick they are impossible to find here in the US especially in late models.

Dan, you correctly prove that scan tools are just that, a tool. With your experience znd training your assisting everyone on how to better use a scanner along with doing better diag's. Thank you!

Reputation here on name brands is at question but as tech, it really lay a challenge on a chosen profession. Great video DD! Enjoyed!🙏

Dan thanks for sharing. I’m not that familiar with Diesel engine emission systems but you not only explained the scan tool anomalies but gave me a heads up on diesel emissions. Thanks Dan and hope all is well Artie 😊

This is an example of one of the frustrating things we are dealing also at franchised dealers business with OEM scan tools. It is not common issue but once happens and you realized you are dealing with false data, you start being an IT guy instead of diagnosis guy, downgrading scan tool versions, looking for known hotfix scan tool patches and trying updating the ECU on the vehicle. It is not only causing wrong diagnosis judgment and good part replacement but also time spent you cannot charge the car owner or warranty.

Running 2 Autel tools and both have performed very well so far. Nice video Dan

Wow! Nice find.Experience is the best teacher.

I realised nearly 30 years ago while learning diagnostics with early eg analysers, or any other digital readout.... If it's unbelievable high... Doubt the decimal point.... Honours to Dan for owning up to a rare mistake.....😅👍

Nice find, but if you move the decimal place accordingly to the numbers from the factory tool and the Autel, All the tools seem reasonable, looks like a decimal indicator problem with the Launch and Snap-on. Cool! The PIDS are getting the right data from the ECU, but are displaying incorrectly. The trends in the numbers in the testing you did made me think of this!!!

Yep, I enjoyed the video! I have two scanners and have experienced similar outcomes.

thanks for the information, great video Dan.

Actually bought a Autel im608 for key programming but turned out to be my best diagnostic tool launch x431 ain’t worth a toss

I had Texa IDC5 say the fault was with the adblue heater and a cheap clone say Nox sensor 2. I checked the feed at the Nox sensor, no feed! The £50 clone was right! The sensor had blown the fuse, I replaced the sensor and BOOM light went out.

Great video, Danny!

The wizard of diagnoses👏👏

Amazing different, when you are making a judgement call on data, and the information is wrong. I think its hard enough to diagnosis some jobs with out questioning your data. Great video again Dan, as I said before, Dan your the man!!

Great video Dan as always, keep up the good work. How would you rate those scan tools from best to worst regarding their capabilities and functions? Im thinking of buying Autel or Launch scan tool what would you recommend?

Thanks again Dan ! , just a remark : your hands looks like real mechanic worker ! Congrats!

Nice work Dan 👍🏼

Very interesting video Dan! Was the incorrect data only on the downstream sensor, or both upstream and downstream? Can you swap the upstream and downstream Nox sensors to see if the problem follows the sensor? I've seen a similar scanner issue twice where the scanner would swap the live data for the rear ABS sensors... Code was for Left Rear, but speed was missing for Right Rear 😅

Had wrong data even with a factory tool showing one of the keyless go sensors for the wrong door handle, very confusing as it showed the lock button working correctly but the unlock didn’t change indicating a faulty handle until you touched the opposite side handle to find that the pid now changed. How many door handles were incorrectly changed & the parts cannon then fired for an ecu god only knows 🤪

Great video Dan, first I thought you were talking about a knock sensor, but when you came to ppm and particles I got it! :-)

you're the best teacher more audible than anyone

Autel for the win I’ve never had a problem with them and love them. I’ve heard people say they don’t like them and that they’re garbage. I’ve used multiple Autels and have always been a fan.

Many many years ago a friend of mine did data capture for Snapon for Holden cars. Data and testing was done against GM/Holden tool and actual cars. Snapon ended up being better than dealer tool because errors in dealer tool were identified and fixed on Snapon. Holden cars were not new releases - GM tool was just not updated/tested very well. But then GM global (dealer) network was using NT4.0 way after it was end of life and totally insecure.

I really enjoy all your work thanks Dan. cheers NZ

Maestro nice to hear from you again. and like always. Great info. I spent many hours tring to get t right scan tool. N i can now say i don't regret getting t autel .. N now thanks to u. i can say it was worth it And t right call. Thank you.

Great video Dan. Thanks. Did you report the issue to the customer service/support department, for each scan tool, to let them know of the problem (so hopefully they can fix it in their next software update)?

I've noticed a thing. The numbers are so similar to each other. Just put a decimal point after the 3rd number and you'll see. In that case that number matches the correct number that Dan managed to read with the factory scan tool. I wonder what was the number on the upstream Nox with the "faulty" scan tools.

Great Video Dan. Keep them coming.

I loved the tutorial video of the Pure System thanks Dan

Was it not just a case of moving the decimal point to the left?

I wonder if you could take a reading as 10x actual figure, being faulty calculation from the software rather than faulty reading. They all looked just about identical if you took the first 3 readings as a value 10x what it is supposed to read? Just goes to prove that this job is a constant learning curve.

Great breakdown Dan. I think most any tech could have been easily fooled on that issue. It’s great info to know though, and if something looks way off on the data, might bE the scan tool.

VERY well explained thanks Dan.

I think the scanner forgot a decimal place, as you could see on the test drive the numbers went down, not up with the incorrect pids. Its not the first time I've been fooled by a snap on scanner, but for all the money they charge us for these tools, maybe they should reimburse you for your misdiagnosis.

Nice! Did you try generic ODB mode with any of the "lying" tools?

This is sad! In this situation is hard to explain customer that scan tool is lying, not you. Thanks for video!👍

Thanks Dan.🤷‍♂️ very important information.

It looks like, there is something wrong with the multiplication factor in these scantools 😮😮😮

Nox nox Who’s there?

Another great video Dan , we just have to have so many diagnostic toys to do our jobs, well done , at least you have a known good testing Part for these now

Good info glad you brought this to my attention. I guess I was like probably 90% of other people and wouldn't think that you pay Good money for a good scanner brand and it could be so off the mark!

The vehicle manufacturer must provide information to the scan tool mfrs on how to access the data and how to interpret it. Possibly the wrong data was provided to three of the companies, then they found the error and fixed it before giving that info to Autel. Seems unlikely that all three companies would have gotten that same data PID wrong by chance.

This happened to me last week. Chased an APPS signal drop out for an hour but in the end it was the scan tool reporting incorrectly. Verified this with two other tools and a Picoscope. I too have seen the OE scan tool report the wrong data. Fun times!

Never fixed anything on a car and probably never will, but I still watch your videos every time. If Sherlock Holmes had been a mechanic instead..

I love modern life, so we have manufacturer approved repairers using approved software to diagnose, but from experience not enough people experienced to understand the data and find the issue, or we have extremely knowledgable non approved repairers using whatever they can get their hands on (at great expense) that may or may not interpret the data from wherever they source it, correctly. Brilliant.

It looks like, that 3 scanners missed comma in their values (the last zero should be after comma). Try to report this to scanners support contacts :-)

Thanks, Dan. Most interesting!

Weer een mooie toevoeging Danny, goed verhaal. Groet Hans

You are pro ....presentation ,narative ,content,whole...

Was looking forward to the bloopers though. :D Great video, thanks.

an EXCELLENT catch ... well done ..

Great advice, Dan.

nice to see another of your fine video's thank you

Yes Dan... that was an amazing video indeed... thanks a lot 👋😎👋😎

I have an Autel...thanks, Dan!

More videos like yours Dan and the top four will get them to correct them thank you thank you thank you very much

Right from the intro, I love this vid... Dan, I just love your vids man....