Oem vs Aftermarket 

For more information about the Ditex Carscope Viso visit: autoditex.com/ (Main website) www.tfasolutions.co.uk/ (UK) www.ryansautomotive.ie/ (Ireland) www.diagnosexl.nl/ (Holland) For other countries go to the Ditex main website to find your local reseller.

there are a lot..ChrisFix, EricTheCarGuy, Scotty Kilmer etc. But DiagnoseDan is the best.

Great job on the diagnosis, Dan! For electronic components I have learned that the ONLY reliable option is OEM. Even a used or remanufactured OEM component is better than a NEW aftermarket. Now I wonder how the aftermarket manufacturers test their products for functionality and calibration. Maybe they don't at all xD

Excellent description. It's nice to see someone who understands electronics in its fundamental level in car diagnosing.

This is one channel on RU-vid that I really like to watch everything that is coming out of it

The worst fuel economy the owner of this car would have due to the aftermarket sensor probably would be more expensive than the OEM MAF. Sensors are not something you can cheap out on.

That is why I don't use aftermarket sensors, just too much of a crap shoot if they will work right

Well done Dan. Thank you for making this video about aftermarket parts. You killed Nipparts, and you did it right.

where did you get the MAF calculator from??? is it in the tool you are using by autoditex??

Another brilliant video, love how your video teach on a understandable level for most. Thanks Dan

12:00 best part of the video you're welcome people skip to this part🤣🤣🤣🤣 Do I really have to watch the rest😴😴😴🤣🤣🤣🤣

Thank you for your kind words about the VISO oscilloscope. This is an amazing video, Danny. Thank you again for your hard work!

Great video! Well everything except for the way you pronounced Tucson..... ;)

Great video dan! Learned my lesson with aftermarket sensors. In october i had someone diagnose a bad MAF Sensor so i went into autozone thinking what the heck ill slap it on there and boom it was fixed..for now. Last week( February ) i turned on my car to go to work and immediately noticed the idle jumped around and the car smelled like gas. I thought it was just acting up and it would pass so i drove on and going down the street of my neighborhood the car would jerk on acceleration almost to the point that my head was hitting the horn!! I knew something was up but decided to go on the main road and merge onto the highway to get to work. Worst freaking mistake ever. The jerking stopped until i got to around 60 mph and everything seemed fine for 5 minutes. I pushed down the accelerator and noticed i wasnt going anywhere. All the dash lights came on and i realized the fucking car just stalled going 60mph in rush hour traffic !!!!! I had to call a tow truck on the side of the road and towed it into a shop. They diagnosed it to be a bad MAF sensor!!! The same one i had put in 4 months prior almost cost me my life!! Never again am i buying Aftermarket stuff!!!

Diagnose Dan South Main Auto turn me on RU-vid channel👍👍👍👍👍👍👍👍☕

Tuk-son? I know English is your second language, and you speak really excellent English, but the car was named after a city in Arizona. The "c" is silent. Something like to-sonn.

Great video dan Thanks for sharing I think the only thing we need to bear in mind is some aftermarket parts brands have OE or OEM inside there own branded box and are good quality There are many big parts company’s that buy for the likes of Bosch, PIerburg, Valeo etc and just put in there own packaging

This is why I just roll my eyes when I have someone ask me about a drivability issues, and a code they have and they follow it up with I replaced the MAP, MAF, Cam and Crank Sensors, O2 Sensors, Fuel Injectors, Plugs and Wires, Coils, and it still happens. I know they just put aftermarket parts in and threw away the good stuff. I use aftermarket stuff, but most of the time I'd rater find a good used OEM one from a salvage yard vs. going with aftermarket when possible. I have had really good luck with Wells aftermarket sensors though.

Dan, Excellent Tutorial on MAF sensors, that aftermarket MAF was terrible compared to original. Thanks for the hard work you put in.

Hi Dan Thank you for all the videos that you showing us how to repair a car step by step PLEASE do not stop recording how to fix and repair cars I am following you from Iraq🇮🇶🇮🇶🇮🇶🇮🇶 and I really had a lot of information from you. wish and I will visit you at your workshop. Big thank you from Basra, Iraq. 🇮🇶 Note Make some funny records I like it 😂😂😂😂😂😂

If you're going to keep the car, use OEM. If you're selling the car, do what used car dealers do and fix it as cheaply as possible.

Great case study Dan, it proves why we as professionals should insist on OEM parts for a proper repair. Love the MAF calculator, looks just like the one we have for our Tech Support Group Subscribers from TFA Solutions 👍

Please turn down the music and background music. I could enjoy the video, then. Thanks..

Dan that is a fantastic video great content and very well presented. Keep up the good work

Dan understood you the first time & 2nd time. I gave you a thumbs-up but repetition over & over almost made me change the video! It's a good video just, less repetitive when explaining the long version.

I always get away from aftermarket sensors... But sometimes you can only fit what the customer is willing to pay for... Great video again! Thanks for sharing!

Great comparison! I wonder what quality / make and price class that aftermarket part was. It looked like low quality ‘imitation’ level quality. When I buy aftermarket parts I always buy quality ones. E.g. the fuel pump of my car is OEM from VDO. The MAF sensor is OEM Bosch as goes for both O2 sensors. Brake parts from ATE. Spark plugs are from Bosch or NGK. And the headlights are form Valeo or Hella 🙂 I mean VW does not produce all these parts themselves right? Last OEM part I bought was a N75 sensor because I could not figure out what make it originally came from. Further I like your videos because they are like slow tv and I don’t have to rewind again and again because the information density is to high for me to follow 👍🏼👌🏻 Keep on going !

Hey Dan, great video! But I have one question: how can I get the calculator for the approximately g/s airflow? Until this point I only knew the calculator for volumetric efficiency from OTC thank you for the great videos!

Diagnose DAN okish.... ha ha nice work buddy stay well

Dan fantastic video. Thank you for sharing all of that knowledge. Please keep your videos coming. I only follow a few guys and you are definitely on top of the list with Eric O Paul Danner Keith DeFazio and Ivan from PHD. Thanks for your time and knowledge. I

The term OEM is very misleading. For example you will buy spark plug for Audi will you buy VAG or NGK? How about Ford Motorcraft or Autolite? Are you willing to pay more just for the Logo?

The 1985 Chev Blazer call mass airflow pin, i mean "pin" which is called.

Get an EV and 95% of the auto problems are fixed.

Hi Dan, thank you for another great video. This has prompted a question : when you say original MAF sensor do you mean an actual Hyundai one or an OE supplier one, conversely when you say an aftermarket one one do you mean a no-name cheapy Chinese one or an OE supplier one. As we all know, Hyundai like all car manufactures don't usually make their own sensors, they buy them in from the likes of Bosch/Delphi etc. So what I'm getting to is, having seen this video and after your answer to the above question, should I really only buy sensors from the car manufacturer, or can I, in your opinion work with OE supplier sensors with confidence?

One thumbs down, already?? What the heck!! Dan, you must have done something really bad, to get this guy mad at you!! I just can't figure out what was so bad! Did you take his family farm, after a lost bet? Did you tell the world that his mother and father were never married? Is he the maker of AFTER MARKET PARTS? It must have been something really bad, to give this video a thumbs down!

This proves why OEM should be used. great video.

Great explanation of MAF sensors. How can I get the formula for calculating MAP or is there a software program I need to purchase? Thanks

i have nothing against after market but dont they test them before th ey are shipped ????????

Have you ever heard of a pulse signal from an ECU? Apparently this is the cause of my radiator fan constantly starting and stopping every few seconds. There's 2 fans on my cooling system and the larger of the 2 is the problem. I took it to a local mechanic and he said it was a dealer issue and he couldn't fix it. I replaced the thermostat and thermo switch but to know avail. The engine light is on. This is the only issue with the car.. 2005 seat Toledo MK3 1.9tdi bkc engine 105bhp.. any help would greatfully appreciated..

Hey Dan I love how you explain how the systems and components work as you diagnose them! Thanks for all your videos!

Those aftermarket sensors (lambda, MAF, MAP etc.) can be pain in the butt. Specially when customer have replaced the sensor with aftermarket one himself or somewhere else and car still not working properly. Oh boy i remember one aftermarket lambda thats was driven only about 100km and it didnt want to stay closed loop. I had hard times to get customer to believe that he has to buy original lambda to fix the problem. I promised to pay the sensor with my own money if it didnt fix the problem. I won the bet and got new regular customer to my company where i was working. :)

Was that AM supplier the same one used for the faulty wheel-speed? The box markings looked the same. They may want to revisit quality-control.

I like load testing power and ground ckts with a 9007 headlite bulb, cheaper than a test lite. I have had horrible luck with aftermarket sensors, especially the reman ones, one subaru I worked on, we had two bad out of the box, so we just got one from a wrecker-finally fixed it.

That's the problem with testing anything. Which is correct the OEM or aftermarket or neither. However if either is off .13 volts which one is better or worse... and that leads to the computer telling other components to adjust and are they working correctly. As you said cars get old so that's why value ranges are important. Who is to say the aftermarket from a local garage or a OEM from a dealer is the better value.. I like the simplicity of that Ditex, now if it could just have the option to give the manufacture testing values of the components..

Thank you for being such an outstanding teacher. I love everything you do Dan!

Wow!...This is very good info. regarding the quality, or lack there of, regarding aftermarket parts. This is especially critical in electronic engine control replacement parts! If price is all you care about, be prepared to experience less performance & gas mileage as well as likely lower reliability. In this case...you get what you pay for! Very good content Dan. My first time on your channel & I am impressed with your attention to details & your thoroughness. GOOD Job!!!

This video is proof beyond reasonable doubt! Dan is the real winner here : he made a great video and got himself a free test light! 😁

Thats quite disgraceful the large difference in outputs. Is there no followup RnD from these companies to ensure they get as close as possible to the mark? And considering in this age of social media and how us DIYer's look for known quality you'd think parts manufacturers would get their game together. Sometimes on older cars you cant get OEM anymore so you rely on AM. I mean how much extra would it cost for them to use better bits? Bugger all I'd say especially when this can relay on to higher sales due to a good reputation for good quality replacements. Word spreads fast on the DIY grapevine now.

Hi dan. Just curious if the aftermarket values affect the fuel trims?

Great dandiagnose the best engineering technology

Danny, where did you located the maf output calculator app from?

🌟🌟🌟🌟 for you Dan ... you and..( hps mexico)and (New Auto Level )are my favorites. One more star wating for you if you make videos of toyotas and hondas🤓

in·can·des·cent. Dictionary result for incandescent /ˌinkənˈdes(ə)nt/Submit. adjective 1. emitting light as a result of being heated.

Excellent you provide a great understanding

Was wondering, if the after market senior gives a lower reading won't the engine be running leaner? Also, Would the upstream O2 sensor pick this up and adjust the fuel trim to compensate?

Good proof Dan, That there not worth stocking in the parts suppliers. !!!its an epidemic !!!

Hey Dan, not to nitpick but that is a Tucson...yep as you said it but it's said like this "Tooson" the C is kind of silent...I know another english language oddity.

Super video as always Dan! Having been burnt with aftermarket sensors you are money ahead buying OEM. I will however use Bosch if available. I'm going right now to check out this scope. Thanks again!

Unbelievable difference. These aftermarket parts are just not good enough. Great video Dan!

Damn that company single-handedly discovered a way to save 20% fuel cost the world over I'm investing what's their name?

Thanks for using the vizo as you promise! You shpw know how to use it and is user friendly. as far as i am concern the verus is way too expensive youll be paying for life for a veruz which is bullshit!

That difference between air mass calculations between OEM and aftermarket is potentiality an engine destroying difference.

Hi. Great channel. My only issue with comparing two MAF sensors is how much of a deviation is there between two OEM sensors. Would the fuel trim not compensate for any deviations in MAF sensor readings (or even a dirty filter)? Shouldn't the engine adaptations be cleared or the vehicle driven enough for the fuel trims to compensate for any differences in readings before condemning the aftermarket sensor.

OEM all the way !!!

Dan your diagnose skills and equipment are absolutely amazing, added to your ability to teach anyone interested in learning, makes it perfect. Thank you again.

hey did you realize you have been pulling some parts changer already about 7 haters 😉

dan, could you have used your fancy new test light to jump the ref wire to the signal wire..to check the integrity of a signal wire..I think at least sometimes it can be done

Dan, here in America the majority of after market parts that are junk or doa are made in China, sometimes Mexico. Where you are from is this also a problem or are us Americans just un lucky? Here, we either take chances at parts stores or online retailers or buy oem at 4x the cost.

great video DD do you know if the MAF calculator can be used for a VE calculator on a speed density car ie chrysler honda to see how well an engine is breathing? best to you Dan

Maf just went bad on our personal Nissan. This is why I ordered a oem Nissan part and didn't want to take the chance on a aftermarket part👍

Most Aftermarket Sensors are not manufactured to the same High Standards as the OEM Sensors. Its too risky to use Aftermarket Sensors.

Thanks dan great video that shows just how bad aftermarket parts can be it got me thinking on how many guys put those sensors and then they are left scratching their heads. I feel bad for them

Thanks Dan from the U.S. I always enjoy watching your videos. Please continue.

Why didn't you try to clean the sensor before replacing it? Not having a go at you, just asking.

That aftermarket MAF is robbing power from a poor old engine. Possibly ended up killing it due to extended lean condition. How ruthless! Always an amazing diagnosis n fix from you. Can't wait to see more coming. Cheers.

I would do a comparison with a few different aftermarket versus OEM to see which aftermarket is better

Wow, v interesting. Guess u get what u pay for. Would be interesting to know the actual price difference in the 2 parts

Cheap electrical components gets all stuff of issues. Less money less music. The car is not running 100 % but there is no engine light. ' sometimes it is'😂 Very good professor and thank you for the video.👍

As always. Topnotch video dan. Very cool stuffs and lessons. Thanks

I wonder who REALLY makes the OEM parts ? VW, Hyundai, Mercedes ??? C'mon people, there are Aftermarket parts that are way better and way cheaper then OEM parts. You think that a Bosch fuel filter is not as good as an OEM one (that could also be a Bosch) ?

Great vid Dan, but I would also like to add that you could have tested all of this with a cheap multimeter... (voltage out, ground voltage in and continuity from sensor to pcm). Also most cheap code readers with live data, (even non graphing) will tell you grams per sec. I am a poor technican, like most of us in the states I make due with what tools I can afford. Believe it or not most shops in the US don't have lab scopes. We here in the US have awful aftermarket MAF sensors too, the worst are remans from a place called A1 cardone and they should be avoided like the plague.

I don't like aftermarket parts .prefer oem all day long . And the maf sensor snapon is correct it most commonly part to get changed . You see it on the net .it will be mass sensor and they not even plugged in to the car lol

Are you not supposed to do an offset calibration / teach in procedure for these MAF sensors? That would explain the difference between two sensors.

after market not good i wonder if that is the case with all aftermarket parts

Hey,Idol Dan,please check how you pronounce the word "Hyundai" and "Tucson". For all we know you're no American,but it's just cringe our ears to hear those two words.peace.

You're gonna make them put a hit out on you degrading their parts😂😂😂 Knowing what you know about that brand, will you continue to purchase that brand part?

I can’t find the DiagnosES website on the internet please give me the link 😅

I got burned on an ebay MAF for a Nissan. I should have known by the fuel trims that it wasn't working right. car would randomly stall at idle, big PITA. thanks for the wisdom Dan.

dan, where did you get the manifold pressure as 300 bar from scan tool ?

China'a Finest...am I just repeating myself here?

ow my God........,3 weeks and no video,Dan.........,you are........,cruel Man)

You teach perfectly like u have been a high school once. Your step by step and patience is unique

Question:You didn't check the heater voltage. In your description of operation you said the heater is part of the feedback circuit of the amplifier. What if the heater was not operating? What can one expect to see on the heater wires? I'd assume it might be a similar signal to the sensor output since the voltage must vary in response to the amount of air flowing as well - No? If the heater is open (or the pcm is not driving it) what would the output of the sensor be? Zero (like you observed?) Maybe the heater was bad or the wiring or pcm output was bad. For a thorough check it might be wise to confirm the heater circuit as well - No?

Hi dan Was there a noticeable difference in fuel trim values, I find looking at the fuel trims really help when diagnosing mass airflow sensors Great content by thy way I love your videos 👍

Oooo Dan, that aftermarket sensor is better!? MADE FUEL ECONOMY...HAHAHA safe fuel and money...hahaha... just joke.

This is one big reason why I am an advocate of OEM parts, even on older cars. If outfits a new car with a sensor that's bad enough to noticably affect driving behaviour, but good enough to not trigger a check engine light, imagine what it would mean if you are the lucky one with a "good enough" ignition coil AND injector AND pump AND camshaft sensor.

Exselete diagnostic amigo nice video. Good tools.

Hello Mr. D. ! I have a question for you. I know in your country they use to run the petrol cars on LPG. Do you encounter the problem of ceck engine light, do to lean condition , and positive long term fuel trim ,how it can be fixed? Thank you ! Cheers!

Goedenavond Danny, Weer een super duidelijk verhaal, in combinatie met Electude echt goed gedaan. De vergelijkende test als conclusie, Top Groeten Hans

Nice Video but at the end of the day we cannot always spend the extra time and resources to compare. It seen to me that over the last few years OE parts have gone down in price and that is why I often just price the customer the OE instead of the aftermarket. I think we have all ran into that same problem here and there!