Every now and then a job like this comes along, and kicks your arse. It is just to remind you to be humble, and it usually renews your respect for what you do and makes you extra careful in future. Good that you got it sorted in the end, because thats what really matters.

Wow 3 fun-loving times. I know the feeling. While watching I was wondering how your back holds up to all that, and then saw that work stand! Nice. IMO you are the best instructor. Never pedantic or boring but well humored and cleaver. You are saving people so much grief with your vids. Thank You Sir.

Brian your videos are so helpful across all makes and models. As a shade tree mechanic myself, I always learn new tips and tricks from your efforts. Thank you.

Its okay man, you are waaaaayyy ahead than any of us. Your patience to save us from severe headaches is very honored. Thank You on behalf from all the people that learned from this video.

Your video has inspired me to do more repairs due to the fact your instructions were fantastic! My knock sensor areas was full of water and bank 1 was completely rusted. I have completed the repairs and No check engine light! Thanks and keep the repair video coming.

best video ever man... helped me out a lot and only took a couple hours to change out the sensors.. this video definitely saved me from spending big bucks at the dealership. i appreciate the details at the end also.. awesome job

Just wanted to say you are the man... I am not a mechanic but with your videos I have been able to complete a few decent sized jobs.. thanks for the great videos

This is absolutely the best demonstration I've seen of this job. Great video Brian!

I just wanted to thank you for showing me how to replace the knock sensors on my 2002 Avalanche. It took me a while longer than I thought it would but knowing I had all the details from your video to fall back on I dove in, took my time and got it done. It was even slightly fun. Keep 'em coming!

Thanks for posting this. I just replaced the knock sensors in my 2001 Chev Silverado along with the gaskets and wiring harness. All Chev parts! The only extra step I took was I removed the alternator to give me more room to remove the intake manifold. This job turned out easier than I thought. Great video, Thanks again!

I just came across this, I am getting ready to do this this coming week while we are still under covid-19 house arrest. I have never seen a creeper like that!!! I hope I can get one, it will make the job much easier. Thanks for the great vid, I feel more confident that I can do the job.

I watched your video, got some good pointers that others leave out. Was able to remove & replace the sensors, harness and also the fuel injectors too. Came apart quickly and back together fairly fast. Fired right up, cleared the codes and road tested in under 4 hours. Thanks for the video.

Thank you, thank you! Im right the middle of this i found your at just the right time. Cheers

This was a great video and very informative, ive done alot of these intake gasket, knock sensor jobs on these motors as a gm technician and I think you covered it perfectly for the DIYer at home I think I may have even learned a trick or two. Thanks for what you do and always trying your best at putting out great information!

Great video! I'm getting ready to do mine; had an incredible amount of rain lately and had to chug through some standing water and, well, the engine got soaked. It kept on running though! Thanks for taking the time to make your videos, Dude!

Followed everything step by step. great job saved me $400 . Thanks for the video.

Interesting Brian. I am replacing a 5.3 now, and the replacement motor had that bead in front of the lead sensor. I was trying to figure why it was there, and I happened to see this video. Thanks for taking the time to make these videos and educate the public.

I just replaced my knock sensors on my 05 Silverado, just finished the job 30 minutes ago, using this video and it was tremendous how accurate and in depth it was. Thank you so much. After all was said and done it's not a horrible task but if you've never done it, it seems almost unlikely at best. Thank you so much again. This is the only video somebody should and and needs to watch to do this job. My truck is much more sound now that the ratios are restored to the norm.

Brian, I been watching your videos for a long time. I want to take this time to say you are doing a great job and to thank you for informing your youtube subscribers on the daily work we go through. I'm an ASE master automotive/diesel technician with 24 years of experience. I have enjoyed watching your videos to see the inside of a fellow technician doing his work. I have done hundreds of these knock sensors throughout the years because of the poor design of the location of the sensors getting rusted and the poor quality of the wiring issue. I never once thought about running a bead of silicon to divert the water from the sensors. Very good tip by the way. I also remove the rear foam inserts and throw it away. I only use AC Delco sensors and wiring harness with these repairs. I'm sorry that you had to do it 3 times, I know the pain on having to do the job over again. Good thing these intakes are easy to remove but we still lose money when we have to do more than once... From one tech to another you'er an awesome tech and that from a tech that has worked with hundreds throughout the years...

you are an excellent instructor because of this you will be in high demand so beware of burn out.you have helped me alot thank you.

excellent video. You really know your stuff...thanks for shooting the procedure and sharing. A lot of work after a lot of work!

Brian, I love you more than my brand new magnet extension. Thank you for this vid!

You don’t have to take the throttle body off, it’ll come off with the intake manifold as one piece. Just disconnect both hoses underneath it. Other than that great vid

Dude, this is the BEST knock sensor video! You do not waste words or time. Nothing is worse than listening to someone yammer on about some BS while you're leaning over your truck trying to get these stupid things out. Thank you for being so thorough!

You are awesome! Thank you so much for sharing your knowledge!

Super job on the Video, thanks Brian. Saved me a ton of time.

Another great design from the fine folks at generous motors. $10 dollar part, $500 hundred dollar repair, I swear this is done on purpose to keep the revolving door of money rolling in. Love the effort you put into your videos Brian keep them coming.

Amazing job on this video. The best camera work too. So helpful. Thank you!

Brian I cannot thank you enough for posting these vid's - I was at a serious stress point and your videos are like zen auto repair - your commentary is both calming and informative!! I love the way you talk through every step you are a tru pro! In a world of bullS*@# you are contibuting something real! Dude keep it up!!

Excellent video. Just replaced both knock sensors, wiring harness and intake manifold gaskets. I followed your video step-by-step.. All dismantled in about 1.5hrs.. (One minor issue... Anti-freeze from throttle body hose made a small mess until I was able to cap it off.).. Other than that.. Replaced the sensors & wiring harness with A/C Delco OEM parts (and used RTV as per the video & service bulletin).. Also used Fel-Pro's metal frame gaskets for the intake. I had it back together in about 3.5 hours.. I snapped a bolt on the intake manifold when I was tightening everything down.. Fortunately there was enough of the broken stud showing. A quick removal with a vice-grip and back in business. One thing I would recommend is to change out the intake manifold bolts. There are 10.. The GM dealers charge about $25 for 5 bolts.. so two boxes will set you back another $50. Again... What looked like a daunting task was made easier by the video's step-by-step instructions.. Also.. He provides some comedic relief which makes the job a lot easier! GREAT VIDEO!

Hi Brian...just wanted to drop a quick note to you and say thank you..,.l had the notorious rear knock sensor go out on my Chevy and because of your Awesome video l was able to save myself the quoted $405 dollars the local shops wanted to charge me to fix it. Keep those videos coming they are appreciated more than you know.

Brian, As always very detailed and informative. Coming into a new shop you are always going to see something for the first time, while fixing knock sensors on other vehicles do not always pose the same problems I found that I didn't research the TSB's when I first investigated the problem, had to redo a truck again after it came back I looked for TSB's and found the only step I missed was the Silicone 'dam/barrier'. Ultimately it can be discouraging for someone to do something twice even a third time, but I want you to know that I appreciate your tenacity and zealousness to teach others while having to go through it. You are a inspiration to others, namely myself and I am getting together the funds for my camera to start on my car vids! Always looking forward to your weekly adventures and videos! Keep up the good work brother! Cheers! Nick

Brian, Thanks for the video. It's going to be the second time dealing with the knock sensors. I also used Aftermarket sensors. Learned a valuable lesson.

Thanks brother ! Good job and detail. I've had this to do on my 04 GMC Sierra for two years and have been putting it off. Inspection due again and I'm in a bind !! Gonna start ordering the parts and get prepped up for it now.

I have a 2005 Silverado that came up with a P0332 code and this video was extremely helpful with the repair. Thought this would be a harder, but the clear step-by-step instructions was helpful. I was able to fix it on my first try. Thanks for posting this!

And that is how I am going to spend my weekend in an unheated shed. Thanks for the video and tips. I can now visualize my fun loving time working on this.

i think your videos are awesome. Honestly, i can follow your lead step by step which is a good thing because I am a do it myself kinda girl. Thank you !!

Brian, great video as always. I just changed the knock sensors on my 2003 Hummer H2. It was quite tough because I don't have an overhead creeper. (The H2 has a front-hinged hood which gets in the way of any front access.) Both of my sensors were severely rusted. I'm trying an experiment this time. Instead of using RTV to build a dam around the wire caps, I used RTV between each cap and the rim of the hole. I'll let you know how that works out in a few months.

Nice work putting this video together. You give information which helps with installation and the extraction of various parts to get the job done. Really lots of great tips, tool sizes ect. Thanks Patrick in NJ

Hey thanks for the video. I followed the video to the t and got mine done. The back one was so badly rotted that I had too chisel it out. Thanks for the vid again.

Thanks Dude, I know this is old but it helped me now! Had a rough idle for 2 years but it would never throw a code, got knock sensor 2 code twice in 2 weeks, already tried everything else so hopefully this is it. Always like your videos, you explain stuff well for us shadetree guys that can't afford a real mechanics services. Much appreciated!

Doing mine tomorrow...thx for the detailed vid! Wish me luck!

Great video, Brian. I hate doing things twice let alone three times. Unfortunately, that's how we learn sometimes. As long as it's working without problems now is the most important thing. When I see a failure for the first time I usually search for TSBs.

Glad I found your channel and was happy to sign up and share your channel with all my trucking buddies

Excellent video filled with detail! Thank you thank you!! I'll be attacking this tomorrow on my 05' Sierra. Couldn't finish the breakdown because I didn't have a 1/4'' extension to get the 10mm nuts off the throttle body lol. Hopefully I can get it done tomorrow.

Nice detailed video, I need to do this on my 6.0 2500 hd. My OCD was going crazy with how dirty you left everything under that cover. I would be going to town cleaning every surface of oil and grime before putting the manifold back on!

Thanks for the long vid, Brian; I enjoy them.

For anyone that doubt this man….. I had the same everything, down to the year of the truck, same symptoms, same codes. Everything. I did what he said, and no more check engine light, I have full power back in the throttle, and couldn’t be more happier.

thanks for an excellent video! this helped me greatly, now i just have to remove the rotted out sensor.. should be fun, hoping it will come out without having to remove the valley cover

I'm an old man who worked for GM and would have loved to go to work if you'd been there. You make knuckle-busting look fun. Check out some of the old re-calls for Pontiac fire-birds; I loved ripping up those floorboards and welding rust...LOL ...You are Way Cool man

I've got a 2003 and the back knock sensor was rusted. I'm glad I seen the video first prior to putting it back together. Lots of carbon in the chambers though. The vacuum was very busy along with the cleaner to get the head portion clean.

Did mine yesterday. Very helpful. Thanks.

Great job on your videos watched a lot of them and they helped me out.,

Just FYI this is an excellent video for THIS Chevrolet engine. The 8.1L Chevy engines (in my RV) has the knock sensor on the outside of the engine. Great news for replacement.

Awsome video..Alot of info, A little humor,Good learning.Thank you!

That topside creeper is awesome... I saw someone make some big V's of RTV before each sensor, but I have also seen your method. Very nice video.

Very informative and detailed video. Perfect man!

Nice video brother but seems like a lot of work, thanks for sharing have a blessed day.

My CEL popped on for the rear sensor a week ago. I cleared it and it hasn't come back on, but I know it's only a matter of time, especially since I'm one of those that clean the engine every 6 months or so. Thanks for the video. Will reference it when I get the lucky draw.

Thanks a ton for the video, I just went through the painstaking process of replacing the knock sensors on a 06 2500HD. I went with the OEM from the dealership (GM Part No.), Bench tested both with a multimeter before install and at various points during installation. So far so good!

Awsome. Thank you for all the details.

wow great video. First time seeing that much detail on taking apart these systems.

This video is the best it worked for me Thanks Brian

Hey Brian, There is a way to stop the automatic lights from turning on in GM vehicles and it is very simple. Set the hand brake while the vehicle is off and the keys are out of the ignition. Next time you go turn on the vehicle the automatic lights shouldn't kick in.

Damn my man. I have a issue with mine on my 2006 1500 HD 3/4 ton 6 ltr V8. I use is to haul my 32 foot fifth wheel . Both were my father's who passed away at Christmas. He just drove the truck as he was to sick for yrs to do anything and as a retired log hauler in northern Ontario Canada he was too proud to ask for help and we never knew if he had problems. I could easily buy a new HD truck but as it was my dad's I can't every sell it and am looking to get it running good before I start it's full restoration back to new in memory of the old man. Your video has helped. I was going to use aftermarket. By the way I see alot of videos and your great at explaining without alot of non sense. Hope you make more videos. Respect from our family to yours. Beardmore Ontario Canada ( the frozen north

You rock balls man! Saved me alot of steps and questions

Great job. Thanks for taking the time to make this video.

Good work man I change the sand parts my Chevy Silverado

awesome tutorial. thank you for filming

Third round for me, as well. Thanks for the video

I pulled that spring out on that auto light switch and it works great now ! Just put where you want and it stays there..

Thank you so much for this video! I did however break my evap tube 😂 in the process. I did remove the foam from the back of the intake manifold.

Thank you for the video I am going for around 2 I use cheap sensors and harness I won't be doing that this time you are very thorough without being overly so very good job thank you

I see Its for moister to get out did not hear when you said that. Makes sense. Thanks for the video really helped my out.

Thank you very much for this video. I really appreciate your knowledge. And your advice. I hope the 3rd time was the charm for you.

Correct me if I am wrong but the dirt/corrosion of the holes do not play a part in connectivity. It is the actual threaded hole that needs to be clean, I wire brush to clean the threads as you would clean battery post and connector to insure the threaded part of the knock sensor makes good contact with the threaded portion in the valley as that is the actual point of contact between the engine and the sensor itself. Wire brush that comes from gun cleaning kit attached to the drill should work fine. Another area is the connector that the harness plugs into, those should be scraped to help with connectivity. Over time a film builds up over the metal contacts that can cut voltage or prevent full time clean contact. Great video, you made short work of it.

i want to say thank you for your help it help me out

great video on knock sensors!

Thanks a bunch, great video and I'm on my 2nd round. I also went with ac delco knock sensors. love my 2000 chevy 5.3 vortec and I've found it likes OE parts . Thanks for the refresher course. Ken in Boise, ID

Fubar cluster fuunnnnnn time lmao good save! But for us mechanics and truck drivers might as well go for the gold lol

Thanks for the video bro, got an 05 avalanche that needs this done to it. Thanks for the torque specs as well.

Great video very informative thnx! I have an 0332 that has came back twice so..worse case I'm going in. Also I appreciate you being real about the whole operation

Super video Brian

Thanks Brian. Great video.

I have enjoyed watching your work the way you explain as you work is excellent and you modifying some of the set up GM does is right on thank you for posting I subscribed looking forward seeing the other videos God Bless

Thanks alot for this very detailed I just wish it really would take 28 minutes to do this

Just did this for the 3rd time. Had been using ac delco sensors. This last time both sensors spun in their housings and wouldn't come out. I ended up breaking both off in the block. They break extremely easy in that situation. I was able to get the broken pcs. Out easily with a good bolt extractor set. I tapped both holes and made sure the new sensors threaded in very easily. I used ntk ( ngk) sensors this time. Bench tested both with a multimeter before putting them in. Used a new g.m. harness purchased at the dealer. I had a dorman harness that tested fine but I still changed it anyway. Got it back together and good now. Finally no more codes.

thanks for the detailed video. attempting this for the first time tomorrow.. bought gm parts (thanks to my awesome discount)... hopefully all goes well. 03 1500HD 6.0

Very nice work!

Excellent job on the video bro... Thanks

Great video really helped me out

Damn. I just replaced the sensors on my Tahoe but I didn't remove the rear foam pad on the intake. Hopefully they'll last another 250000 miles before they go bad again. Nice video bro.

Nice top side body rest, needed for any dude working on a truck as they seem to get taller. GM produced some TSBs' on this issue or codes, but using RTV inside and outside will be 98% of the fix. Cleaning the interior knock sensor mounting location is an excellent idea. I would use a high temp red RTV silicone because it appears to be a better formula and hated the 90's GM black stuff as it hardened up over time. It's a choice, but as a lot of electrical repairs, I got into the habit of using dielectric grease on the connector which keeps moisture / water out but helps with any corrosion however slight but create resistance. As you well know by now, a lot of circuits use a 5 volt DC signal supply voltage, dedicated ground back to the PCM to keep its' internal ground at the same baseline, then the signal. So the smaller the voltage, the higher the resistance issue becomes. So I keep dielectric grease handy and tubes everywhere. The best value is found in boat stores in the parts department. Mercruiser / Mercury sell these large 20 oz tubes for a reasonable price (Per Once) as the service manuals and common sense has a tech use it on every connector. Hell, I use it in my flashlights, batteries in my DMM...every where. Just a one thing. I am lucky to have electrical connector boxes with thousands of terminals, so I find the correct one and check for pin fit. The tension a pin "Feels" like when inserting or removing to test if it is damaged, loose, spread or just needs replaced. Many purchase new ACDelco knock sensor harnesses as they are not too expensive regarding what it take once you are in there. ASE Master tech since 78 / Retired Good video, nice clear easy to hear. Thumbs up! Thanks.

Thanks for the video man! Good job

Third times a charm right?. Thanks for the info.

Beneath an old Georgia pine! Love it!

this will be my second time, I guess I should go with AC knock sensors...my first time I was smart and use silicone, and new harness. but now I don't know that's the problem! anyway thanks for the video, and wish me luck.

Great information. Thanks

Excellent job thank you 🙏🏻

my father in law went through this 3 times with the local mechanic, they ended up filling in the well with ultra grey after another round of sensors. I don't know if the sensors were AC Delco or not. However, the truck hasn't tripped the knock sensor code since.