You were so worth that 3 hour drive! Nice job Ivan!

About 25 years ago when training as a Bosch techie, heard a story about a Nissan that came in with a problem. This was the early 90s so fuel injection and engine management were still new. Car apparently had an issue when towing a trailer. At certain speeds the car started losing power as if the throttle was being held back. With no trailer it was 100%. And with trailer, it was speed dependant, and not gear dependant (I.e. not engine rev related). To make matters more interesting it turned out to be one specific trailer, as other trailers towed fine. After a little investigation it was discovered that the trailer hitch was for a 2inch ball, but the tow ball on the nissan was 50mm. At certain speeds the .8mm difference was enough for the trailer to oscillate at high enough frequencies on the ball to send a false frequency through the chassis and mounts to the knock sensor.....

I've found that more manufacturers are tying in simple faults that normally wouldn't affect drivability to more critical functions just to get the owner to get the simpler things fixed. My Subaru Forester for example had the P0420 catalytic converter code. This made it lock out the cruise control and traction control. Bells and whistles. The more there are, the more to break.

This is a life lesson for troubleshooting. It's hard to imagine the car was parked for almost a year for an hour's worth of work. GREAT VIDEO!

Nothing like when they throw the parts cannon at it⁉️💯😂😂😂

It shows transmission shops don't always know enough to care or research the issues. Isn't google cool sometimes. It was also sweet that someone was willing to share their problem and eventual solution. The customer must have been ecstatic. Great job Ivan and for not limiting your options.....Pete

That connector being previously disconnected means somebody was so close but yet so far. Being able to ohm out the sensor made all the difference.

I don't have all data but Google is amazing. That is if Ivan hasn't already solved my problem before. Glad to see think tool back in operation.

The owner is very lucky. A lot of transmission shops would have tried to sell him a full rebuild.

...geez...who would'a thunk it....a knock sensor causing the transmission to go into limp mode....Ivan, your diagnostic skills continue to amaze me....this was a very enjoyable and informative video....thanks for posting... 🙂

The sad part is that the guy at autozone could have fixed this car at the parking lot, just to throwing parts and no really knowing how to properly do a diagnostic. Great job Ivan 👍

I've learned that lesson the hard way working in maintenance in a factory. Don't leave any obvious faults behind you, even if they don't seem related. They will sink you every time.

This in so many ways is absolutely ridiculous. Fair play Ivan for fixing it and getting to the bottom of this, but how in the name of God can a shop keep this car for 8 months and still not fix what is frankly under their nose with a bit of research that is available to everyone. Well done Ivan. Easy one for those of us in the know 😀

I have said this for MANY YEARS, Fix what you know is broken. As usual, well done!

Your comment about doing a search reveals something - too many people think that you need to be super technical when you are looking for either a part or to help diagnose a problem. Years ago you had to be pretty specific on how you phrased questions, but in our more modern times, you can type it in the same as you'd ask a friend, and often times you'll get some amazing results. We just encountered almost this exact issue with the AC in my RV as it failed, and trying to find a simple expansion valve on the RV sites was a nightmare. Typed in a simple search for RV AC expansion valve and discovered that the local Advance Auto had almost the same exact valve as what I had been looking for days for using more technical terms. In a nutshell, type in your search using the KISS principal and see what it does - it might shock you!!

THIS is why we love your channel Ivan! ALWAYS learning something new!

Love your thought process. Great job Ivan!

Thanks, man! Great info! It's really entertaining watching your videos, and the stunningly rich rich source of information, just AMAZING!

when it showed the knock sensor code I thought the engine is in limp mode for sure the 3rd gear on the dash thru the customer for a loop for sure and probably made him go the wrong route with the trans shop. thanks for all the good videos

Wow I have had some problems cross between models but never something quite this crazy! Thank you for the video and info!

I bet your neighbors were all impressed by that exhaust!!! 😆

Man oh man ,you are super, you can fix anything, I wish all shops had people like you,way to go

Wow the reverb on that exhaust would drive me nuts, Super diagnosis Ivan, fixed for a $70 part, plus Battery and your time of course. I have a feeling you just earned another customer!. Stay safe thank you for the time you put into the videos. The more content the more answers solved and the world gains all this knowledge.

Another amazing story with a happy ending. Thanks, Ivan!

Great thing to see how these things work That actually happened with my 05 Toyota Sienna, it was not releasing OD just because of a faulty KS. Thanks Ivan for helping people with honesty.

You r a rare real gifted mechanic. Thank God for your gift!

As always, great job, love your channel

I work for Fisher Auto Parts here in Michigan and yes we try to get the parts out the door in 4. Great video Ivan as always nice fix.

Super stuff, really enjoyed that. All of these videos just reinforce my view that manufacturers have made cars so complex they are almost unfixable making them technologically obsolete so we need to buy another one when anything goes wrong. Heard hundreds of tales of cars and bikes taken in to dealerships charging top rates and unable to fix them.

I love watching Ivan. I can't wait to get home every night after work to see if he has a new video out.

Sometimes, to diagnose a malfunction, just say OK Google 😎 Thank you Ivan! This car will be like new! If you do not take into account the sagging ceiling 😁

One of our 2003 S-10's would intermittently want to start out in 3rd gear. I noticed the alternator making noise and the scope showed problems with the rectifier bridge. Replaced the alternator and the transmission never acted up again! Great video!

Wow, well, all the trouble codes can be interrelated to everything. Damn knock sensor knocking out the transmission! Damn good fix Ivan! Great job fixing an hour of diagnosis! Wow unreal. I can't believe it lol

Made me smile Ivan.....You said "as good as new" and the head lining was flapping around like a main sail on an ocean going yacht lol.....Great video again matey....Saludos desde Esaña mi amigo....

Thank you Chrysler for making it easy to read codes on 96 and and newer vehicles. Cycle ignition key 3 times on and off and on the 3rd time, leaving it in the ON position, the dtc codes pop up on the odometer. That's how i keep my my 20+ year old Durango and Dakota running and my previous 4 Grand Cherokees.

Wow unbelievable. You sir have excellent logic skills!

When you said it had a knock sensor code I was betting that was it as you have said in the past on newer vehicles anything can cause all sorts of problems to show up on the CAN BUS HIGH/LOW.I bet the customer was pissed .Cheers another good video.

Great Insight, You Video has impacted a whole lot to me

This is like an extreme version of what happens to Toyotas (and maybe other manufacturers): when the knock sensor code prevents engagement for some gears. I've seen a Nissan (1st gen Xterra V6) have consistent misfires (flashing MIL) under medium to high loads while in motion (i.e. Drive) simply because of a bad knock sensor. The misfire didn't happen when revving the engine in Park or Neutral. P.S: Bless Mazda for that knock sensor location on this V6. Most other OEMs hide them in the valley.

That gives us all hope! Check that everything else is working right before entering the wrong rabbit hole and lining up the parts cannon.

Nice job! This video reminds me of one ScannerDanner did of an Audi that had no power. It had a code for a faulty electronically controlled engine mount that everyone ignored thinking that couldn't possibly be the problem... But it was setting the engine into limp mode without any indication it was being derated. Btw, the slamming into gear is normal. When transmissions go into limp mode they default to maximum line pressure. This causes VERY aggressive gear shifts. These transmissions are some of the most uncomfortable for that. Good job at keeping an open mind!

Just WOW! Who would have thought it. Unplugged too. Top job Ivan. 🙈👍

That is a killer outcome! Sometimes, it's OK to trust what's in your face. While it is true you never know when for sure, but, your instincts are sharp and your nose for little hints and a fine tuned GUT FEELING, serve you extremely well! Stick a fork in that car, it's DONE! Congrats, Ivan! Keep on making it look sickeningly easy! 👏👏👏👍👍👌

Good problem solving. Thank you. We had an oil pressure sending unit failure send a 2019 Honda Pilot into limp in mode.

Wow thinking outside the box, that is your forte Ivan! Cool beans!!

The look on you're face when you saw the first post, was pretty funny on my end , lol

Honest , smart , funny, you are the man.

I faced similar in a 2013 Toyota Venza... Knock sensor codes and transmission goes gaga... However not exactly in limp mode, but give a violent jolt between 2 and 3. Nice job as always

Ivan, another job completed. As I'm concerned about your safety, did I see you do that "test drive" without your seat belt on? We need you Ivan. :-) A loyal follower, mike

Thanks for the video Ivan great job 👍❤️❤️ it. My Subaru outback had a Abs code and O2 bank 1 and Temp sensor. Fixed the Abs code and all good.😅. Take care of yourself and family and be Blessed ❤️❤️❤️.

Great job, as always!

Mazda 6 Wagon....unicorn. Google search to the rescue of a limp mode Mazda. ~10 ago not knowing better about going OEM, installed a BWD/Intermotor (div SMP) camshaft position TDC sensor form Advance on Civic, Still working like a champ. I think they make decent parts (sensors at least) for Asian vehicles. This one time, scan code alone was spot on solving trans limp mode issue. Who'd a thunk it. I'm sure owner happy to have his unicorn back in action. Nice job Ivan.....again. 👍

cool stuff, never thought a knock sensor would cause that , great diag Ivan , good job

There are actually some really smart ingenious people out there, and luckily most of them are willing to share.

Another fantastic finish

Unreal. Thanks Ivan!

Another great diagnosis! By the way, the colourful material on the top of the dashboard at 4.59 was probably what the owner was thinking when the car went into limp-mode....just a thought....!

Crazy how the knock sensor can cause the transmission to go into Limp mode. Great detective work and fix!

Great stuff Dude!

Awsome job as usual!

I got to admit I wouldn’t have thought it would have been a knock sensor good video

Amazing Ivan!

I HATE transmission shops. NEVER had a good experience with them. I learned though- when my 76 GranTorino's tranny quit- I went to the junk yard and got one for $100 (back in 79) - took me and my buddy a week to do the swap- worked perfect. Learned a ton. Had to rent a transmission jack- but that thing was amazing. Anyway- Ivan, you are amazing. I hope that customer didn't pay those other guys anything. A whole year down because nobody wanted to THINK... other than Ivan of course. What baffles me, why NOT replace the knock sensor?? The code came up on the scanner- the part is south of $100 and it's pretty much in front of your face after you remove the BAD battery. Even if it's a "no way it's the knock sensor" thing- you've eliminated a 'possible'. Again Ivan- just awesome. I'd DEFINITELY travel 3 hours to have Ivan look at a problem.

That was awesome! I never would have thought it would limp the transmission.

Good stuff Ivan.

It never fails; customers bring in the car full of gas, if the tank needs to come out, bone dry if you'll need to drive it any distance.

Great video man keep it up

Good job man u saved me a lot of money I'm a car dealer in Togo Lomé Africa and I really appreciate you 🎉❤🎉🎉🎉🎉u r excellent man keep up the gd work man and make a lot of money

IVAN, you will be AWESOME as always in my book thanks for sharing as always.cheeeeeers

Zoom Zoom! You're awesome Ivan!

What a crazy diagnosis. What was the transmission shop folks thinking ! Not transmission related but it fixed the issue. Thanks for sharing !!

Watching you cover so many topics, I have learned to look at everything going on with a car. AND visual inspection! My daughter's car had a blower motor issue and all my research led to a wiring problem near the fuse box. But, performing a visual inspection on the wiring in the circuit, the resistor had gotten so hot, two of the wires had melted together shorting the circuit. A new pigtail connector and it's fixed! The resistor was fried, that was the original cause of the problem.

8:12 "I guess anything is possible" is the ultimate wisdom in this field and every other field. I remember I was diagnosing a car that had shift problems, maybe even had the same symptoms, and the code that was set in TCM was a) unheard of b) had no information about it on the internet c) there were codes stored in the PCM that has no relation whatsoever with the transmission or how should it shift. After almost 3 days of trying to figure out the problem it turns out that one of the codes in the PCM that was caused by a MAP sensor that lost a ground wire causing the transmission to go in some sort of limp mode and make hard to shift gears, exactly like this car with different sensor and error causing the problem. The car was a Renault, a french car and I will NEVER forget this car ever.

Toyotas had an issue similar to this. If knock sensor faults were set on the 3.3L v6 engine, the transmission would shift through all gears fine the first time but would not shift into overdrive or 4th gear afterwards. Would need to shut the car off and restart it. Replace the knock sensor and sub harness, shifting would return to normal.

Watched this before leaving for work this morning. I told Gloria it was the knock sensor as soon as You said it had that code! How did I get so good? (Lucky for once) There is nothing wrong with a quickly once in a while! 👍👍🇺🇸🇺🇸

Yup! K.I.S.S rule first… just a little farther info. Knock sensor was retarding the timing to prevent engine damage. Also putting trans in limp mode (which we know lol) 3 gear is most likely a 1:1 ratio. So putting as little strain on the trans too. That’s also why reverse worked. Direct drive (input and output shafts locked together) inside the transmission. Just turning in opposite direction. Good video!

I-stop is Mazda's system for stop/start operation. With I-stop the engine stops one cylinder at TDC with an unignited charge of fuel/air so when the cars needs to move again the charge is ignited and the engine starts, its a battery saving method of stop/start control. Its a very sophisticated and intelligent system that relies on a perfect second battery.

Great job!!!

THANK YOU FOR FIXING MY CAR!!!! I missed it so much. The exhaust is a glass pack. It sat for so long and I missed it so much!! 😢

Scandalous! All of it. Except the 15 min. repair and placing a new battery. Well done!

Lesson of the day is ; Mazda engeneers build in a safety feature if knock sensor fails or noticed an abnormalty, the drive train should go into limp mode. Anyway excellent find Ivan.

Thank you very much. My neighbors car had the EXACT same problem. Just ordered the sensor. Wish me luck.

Wow nice Ivan does it again!!!

Great lesson. Fix what you know is wrong and see what happens.

Great video Ivan! Obviously everyone else didn't go the extra mile and do the homework.

Amazing job I hope before I die to be half that good 😁👍🏻

Awesome job 😊

Well done mate

Honest man . wish more PPL like you

Great video and that is right never rule out anything

It is a good idea to check the alternator first. My 2005 Mazda 6 went into limp mode a few years ago and it turned out that the alternator was bad. I had the alternator replaced with one from O'Reilly's and it fixed the issue for about a month--until the car went into limp mode again. The alternator ended up still being the culprit. The problem is that at places like O'Reilly's or AutoZone sometimes the remanufactured alternators are not rebuilt properly. I learned that it is a good idea to have alternators and car batteries always bench tested at the store before buying them to spare yourself from future headaches. Hopefully this tip will help someone.

That's crazy. I never would have dreamed a faulty knock sensor would put a computer in limp mode.

wow .. thanks for sharing Amigo

I'm Dan, Martha's my wife. Great diagnosis Ivan. Funny how complicated vehicles are today and how something you'd think would nothing to do with the problem would be the cause of the problem. Knock sensor/trans. problem, who'd have thunk it.

Nice work

Well done Ivan. As I always say: the answer is out there, you just need to find it - power of the internet.

Ivan, your are the man

Ivan, I think all that car needed was a nice day. Great to see you enjoying the weather while doing what you do. Makes us all feel good! Thanks for Sharing!

Damit man you got bad ass skills! Thanks for sharing

Nice one , ace video.