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The power of oscilloscopes and people that know how to use them. Good job, Oz!

A man that actually knows what he's doing!!! WOW!!! Very impressive!

That was an awesome diagnosis, Azael! Great scope work too. Also thanks for the custom PHAD shot glass! :)

Excellent work Oz, I have been chasing a cam sensor fault on a 2001 twin turbo Subaru Legacy. I swapped out the sensor, checked and double-checked the wiring and so on. I was getting to the end of what I could check! scoped everything and hey-presto NOISE! That alternator seemed fine, was putting out a good charge and all but was causing interference. Changed the Alternator and the vehicle runs beautifully. Thank you so much for your great video.

Good job Oz. Really appreciate your videos. From experience 120 mV AC to 250 mV AC seems to be the max allowed ripple depending on manufacturers. Usually outside this range you'll get sensor related codes just like this beauty you diagnosed. Even if no codes occur it's good to test AC ripple when newer batteries are testing bad. AC voltage is bad on batteries.

Found this video as I am tackling a stubborn P0335 Code on a 2010 Honda Civic Hybrid (not my first choice in a car but as a ride share free lancer; it is my bread and butter) Replaced cam sensor (New OEM) and it’s back six months after the repair. Ocasional abnormal idle. Rpm activity will act up while driving and shifting gears. Lurches every now and again while driving. I appreciate this thorough and informative video. I am still scratching my head on what could be causing this code but it looks like I found myself a good channel to subscribe to in the process. Video notifications are turned on. Great video!

Great Video Oz! I wouldn’t have guessed those small ripples on the cam signal would have such an effect, but when you changed your time scale you can see it clear as day. Thanks for sharing!

Very good information I’m in the middle of an electrical problem but I never thought about the alternator causing all those issues with the campshaft thanks a lot very good video👍🏼

Great video dude! This probably saved me from just running and buying the sensor that the codes are related to if they aren’t actually the problem

Nice diag work bro' This one reminded me of a '94 Acura Vigor that would start misfiring around 2500 rpm. It was late in the evening, so I decided to bypass diag mode, & jump straight to iATN Fix Database mode, where I found one hit on this symptom, which turned out to be related to excessive diode ripple. So, I removed the connector from the regulator, & viola, symptom gone! New alternator fixed car. Thanks for another great diag vid.

It's things like this that motivated me to buy a scope. Love the diagnostic strategy. Excellent work Oz 💪

I had a similar issue with my 09 explorer 4.6,had a P0341 and it turned out it was the alternator problem,changed my alternator and the code disappeared buy itself .Thanks for your video bud

Great catch on that signal. True diagnostics at work!

another great video with great info on the scope thank you

Wow! Excelente diagnóstico! Muy buena observación mi hermano, sin el scope le hubieran metido hasta agua bendita para tratar de arreglarlo.

Now how would anyone ever see this without a scope?! Beautiful video Oz ! Great diagnostic process all the way through

Excelente diagnostico gracias x compartir sus conocimientos sobre la mecanica automotriz.

Great video, the right way to diagnose problems.

You would be vey hard pressed to find that without a scope. Fantastic work Azael

Loved it , excellent presentation ! I’m having similar problem with my 94 3.1 liter Olds Ciera , gone through 13 cam position sensors , very frustrating, especially if that’s not the problem , same trouble code here

Thank you so much I have problems with my cam sensor didn't know what was going on until I watch this video and told my personal mechanic and everything worked out right thank you

When I first started down this path of learning about diagnostics, I was attempting to find a way a DIY'er could bypass using a scope and use common methods (cheap). But as I learn, I have also realized having a scope is required, or, you take it to a good shop.

I liked your video tons more since minute 6 👍🏼

Wow . thanks bro, from I install a new alternator I been getting that p0340 code, I change the cam sensor two times still no change , so it is the altinator, 1998 lincoln navigator. Thanks a lot back to AutoZone I go

Super good vid. Nice verification. Always love the vids!!

That was fantastic Oz!!! 😎💪👍 Way to prove it out. And the great thing is once completed you can verify the repair with confidence! Great lesson

Thank you! I really hope this will help me

awesome troubleshooting, good mechanic!

Thanks a lot buddy Grey Bidrio I love your videos which is Gracias amigo👀👍🌿

Had this problem with my mustang 12 years and no one had a clue what was wrong with it. I eventually found a clue on a crown vic forum and got the alternator rebuild. The guy thought I was crazy for thinking it would fix the cam sensor code

Good stuff man, wish you were my mechanic

Great video my friend you rock. Sure helped me on my 97 GMC Sonoma same problem alternator

You did your readiing on tools u use way to go 👍🙌👏

Very nice video! I am newer to your channel but am very glad I subscribed. Thank you for your videos!

cool man! good job. I got a p0340 code on a Pacifica that will now not start...even after I replaced CPS. BUT!, you have given me another place to consider.

Spectacular video, Oz!!!

Wow great video thank you. I want a fancy scanner now!

Thanks bro life saver.. I got the same problem whit this code tomorrow I’m check the alternator signal and camshaft signal too new subcriptor

Awesome video!! I love you, I mean, this video so much! - your biggest fan

Very well done. I wish your shop was closer

Good catch, great video

Very informative! Thanks for that great information!!!

That was great , my cam pos sensor is barely a year old. The body that the sensor rides on was changed about a year and a half ago. That damn p0340 pops up every month or so, truck runs good so I don’t think that it’s sensor. It’s gotta be the alt. Thank You for the Video.

Hello My friend, excellent diagnostic.

alternator noise feeding through the entire power lines. Nice. The should put filters on cam sensor. nice video

I done my timing chain on astra h, as soon as you suspected the alternator, a bell rang in my head and I dont remember plugging this little connector back in. :/

nicely done!

Great diagnostic and shows why electronic problems can be tricky. I hope those who don't wrench on their cars appreciate why the mechanics they pay can't always solve every issue on a 1st pass. It appears the alternator output noise coupled into the analog ground of the engine controller (needs more filters), and also that perhaps Ford chose a too-low threshold for the VR signal from the camshaft sensor. Perhaps purposeful so it would still work as the sensor magnet aged or if installation distance was off, but also makes it touchy to any noise in the signal or controller.

I also think that my transmission Governor solenoid sensor needs to be replaced as well because it won't shift into gear 3. Out here in Atlanta Georgia it seems like people at mechanic shops don't want to help me so I'm thinking of buying some tools and fixing the problem myself

Check engine came on and code P0340 cam position sensor. I replaced and check engine light still on. So I did another scan and code P0340 was coming up, suggesting that I check the plug of the sensor. It looked good. Watching your video alternator will be checked. Thanks for the info.

I got a 2000 Cadillac Deville DHS it has several codes and im now wondering if it all related to my alternator....putting out to much voltage??? Great video... got the 0340 and couple other electrical issues, hmmmmmm

Great video man good job

KNOWLEDGEABLE Oz Mechanics Great tutorial thank you very much helpful video Oz Mechanics Good Morning 🙏 🌄 From Nick Ayivor from London England UK 🇬🇧

really great video...thank you

Nicely done my dude!

Great Video Bro..

Great video sir !

Good job on the video, not all of us have an expensive snap-on scope, how do we diagnose a P0340 code without an expensive scope?

Hey Oz I have a 2005 Subaru Legacy gt i have a cam sensor circuit code and i changed them both changed the oxy sensors had new coils an sparks done an a month later i got the cam code but it runs fine but when i go to slow down it either dies or has a rough idle. Not all the time does it do this though it is random. Most of the time when i crank up it has a moment or two the idle sounds rough an some times when i put it in drive or reverse it acts up but its random though so no consistent. Would that be the wiring harness to the sensors? being its a Subaru not the best wiring. Or would it be something else cause its not feeling a running like a bad cam sensor thank you for your time!!

My trailblazer doinsame thing changes cam sensor 2 times still showin this code great video I'm gna test alternator

Added information... the Radio suppression capacitors are found on the front of the engine. Those capacitors aren't for the "radio." Capacitors filter out noise just like what you saw on your scope. In other words they filter out radio frequency noise (RF noise). You might have fixed it with the alternator but I believe the better fix was with the capacitor... it only costs $8. Soon the new alternator might cause the same problem and you'll be in the same problem. Excellent video but go further just like you said and don't throw parts at your car. In fact might be able to clean the connections on the capacitor and it'll be free.

Had this problem with my 1984 Camaro. The choke light would flicker and the key buzzer would partially come on at certain speeds. It was the diode trio in the alternator had lost one diode function. Ac feedback caused the choke light to flicker. 7 dollar part.

Oh cool. Alternator fits my other codes. I do miss having access to stuff like mitchel online and tech line along with the dealer tsb’s

Great video man✌️✌️

Wow, thank you!

Does the camshaft position sensor brand matters, such as Dorman brand?

Great info my guy!

Good info!

good job

I understand the video very well. But I have the same cold going off on my 1999 Dodge Ram 1500 5.9L. And i don't know if it's just that needs to be replaced or is it just my distributor not screw down all the way that's causing the real problem

I have an 03 neon that dies when driving. Have codes for cam and crank sensors. Replaced them both and took timing cover off to check it. The timing looked good but I put in a new belt since I had that off. There has been no change it still does the same thing. Is there a way I can test the food of the alternator without the scanner?

Got the same problem, Thanks!

Hi OZ I have a 2006 dodge caravan and I have an issue with it I got an engine light on and it started to run rough tough to start and jerking at roughly 2500 rpm diagnosed both sensors and wires there perfectly fine can the alternator cause this ?

Hi there Oz I have that problem with my 2004 nissan pathfinder I changed twice my camshaft sensor bank 2 cause I don't have that equipment that you have, so you think maybe is my alternator?

I have a 2004 Nissan Frontier 4x4 3.3L V6. It all of the sudden would just not start. It threw the P0340 Code so naturally I had the County mechanic replace the distributor because that is where the Cam position sensor is; well, it still didn't fire after that. I saw another video that said this code could also be caused by the Crank position sensor, so i ordered one of those and it hasn't arrived yet. I also ordered a knock sensor because I also got that code a while back when I was having misfires and needed to replace spark plug 6. It is winter here in Northern MN and my truck is a long ways away from civilization parked in the snow. I really need some help with this one.

The money light 😂

Is there a way to diagnose this without an expensive scan tool? I've just got a fluke meter and a cheap Innova scan tool that doesn't graph.

Great video. Just subscribed. That’s the way to diagnose.

good call

Well, I didn’t expect those results.

You might of just solved my issues. I have a 06 3v gt with a p0340 code and before the code popped I had a check charging system light pop and go away and my alternator whines at high RPM and car surges

I'm having this problem right now on a ranger. I don't have the fancy tools and would not have found this. Thanks. I wonder, however, batteries are capacitors that are used to clean up noise on dc. Shouldn't the battery have cleaned up this problem? I wonder if there is more that is wrong here. Thanks.

Si soy Sergio de México el vídeo me arreglo mi problemas gracias

Just one more thing that makes me want a scope.

He's a genius!

Well done bro. What should the max AC ripple be?

I have this code on a 2012 Chrysler 200 I just picked up cheap. Has new cam and crank sensors and a new connector in the back. Connector tests 5v on one side and minimal on the other. Before the charred connector was changed it was reversed minimal on the othet one and 5v on the one now reading low if that makes sense. Could it be the alternator?

2003 Honda Accord 4cyl. I got a check engine light P0341 that i need to clear. It sounds like a lawnmower when i start it and the RPM drops and dies out. I changed the spark plugs and coils with new ones and It cleared the 4 codes it had that were P0300, P0301, P0302, P0303, P0304 HELP?

I got a question. I just replaced my cam sensor (bank 1) on my Nissan Pathfinder 05 and the code is still coming up. What possibilities do you think it could be? Connector? Wiring? Defective part or maybe something else? Because my car starts fine and runs, just bugging that I can't find the root problem. Thanks for the video, gave me more insight!

Can it prevent the car from starting at all with this fault in the altenator, where you have P0340 present?

Good job.

Nice man 👍

Could this be the same issue on my 5.4 e-350 econoline??

Heloo Oz..this is pretty awesome. i am using a Lexus RX300 v6 engine and i had both my Camshaft sensors changed including the Crankshaft sensor. Both the Camshaft sensors responded positively except the Crankshaft sensors which failed to reset. The code keeps on coming back. i also have this Whinnying sound which all along i have been thinking it comes from the Power Steering Pump. Any advice?

Great video, where did you get your scanner?

I'm having this same code in my expedition. Took to Autozone pulled codes. Had the position senor fault P0340 Said replace alternator, with the cam sensor faults. Will find out more Monday when I have my Tech look at it

Could you please make a video of replace camshaft position sensor of Ford transit 250? Thank you.

Could a bad alternator with a po340 code cause no start for any reason?

7:35 "Let me try to get this, so it could be nice and good." LOVE IT!