Why are my oxygen sensor readings going crazy during a misfire?

“Been intermittently misfiring on cylinder 1 on startup after sitting a few hours. No overheating, no milkshake. Originally diagnosed as timing chain guide. I fixed the noise with an oil change, misfire remains. Drives normal once misfire clears up.”source ↗

“I’m trying to track down the reason for a misfire.”source ↗

“I was inspecting my LAMBDA values after going on a 30 minute drive and found numbers as low as 0.88 and as high as fucking 16.”source ↗

“google tells me this is impossible.”source ↗

“overall have no clue so anything is on the board.”source ↗

“I replaced the purge valve yesterday as I was told that’s a common culprit, but the CEL is still on. What should be my next steps in diagnosing? The random misfire is throwing me for a loop.”source ↗

“Hi everyone, I’ve got a friend with a 2019 Toyota Kluger Highlander with 110k km on it that can’t hold an idle and is blowing white smoke from the exhaust.”source ↗

“P0089 code what’s its the cause ??? Its misfiring bad like a rhythm”source ↗

“I am having some trouble diagnosing the source of my engine codes on my 2018 Silverado 5.3 and was hoping for some assistance.”source ↗

“this one has been driving me crazy lol”source ↗

“Basically as the title states and it's weird. It will only misfire at 70+ mph and I have to restart the car because it goes into limp mode.”source ↗

“My car has been having this problem for the past couple weeks where I go to start it and I feel my engine shaking a bunch.”source ↗

“If I shift it into drive and try to move I'll get misfire codes.”source ↗

“Told me there was no problem that he could see.”source ↗

“No idea what this could be and the mechanic hasn't been able to find the problem. Any advice or idea?”source ↗

“Engine is in limp mode. Flutters when you put some ‘load’ on it/acceleration. Engine codes read misfire P0305/cylinder 5.”source ↗

“I’m certain it’s a misfire but in the odd chance someone has experienced this too. Supposedly this could also have something to do with a malfunctioning boost solenoid.”source ↗

“A few weeks ago I had the spark plugs replaced. Today when I was driving I noticed the car felt slower and when I accelerated the car started to stutter and then CEL popped up I scanned the car and got codes P0304, P0302, P0300 all misfire codes.”source ↗

“So I recently purchased an extremely poor running qx80 for myself, and I’m trying to diagnose the issue on this truck. I can barely get over 3k rpm’s and it’s misfiring the whole way up “choking””source ↗

“I pulled the HPFP and noticed the spring was a little loose, when I pulled on the spring and the plunger it came out”source ↗

“The concerning part is that it is now misfiring on cylinders 6 and 5. Random misfires that i can feel and now it’s running even worse with a low idle code.”source ↗

“i cannot figure out for the life of me why this is suddenly happening and it seems to be getting worse.”source ↗

“When I started up my car it was idling weirdly with a lot more shaking than usual. Had a lack of power and car shuddered when I put it in drive. Checked the codes and got a P0304.”source ↗

“Is this something I could fix myself or should I really take it to a shop? I am your average broke 22 year old and I’m trying to learn how to fix my own car rather than relying on the mechanic.”source ↗

“I’m getting some misfire codes (p0302, p0316) on my 2016 Mustang GT and can’t figure it out.”source ↗

“Last two days I have had an engine misfire after my truck has sat all night; when I hit the pavement and start to accelerate”source ↗

“Mechanic told me it didn't register long enough to tell him which cylinder the misfire happened on.”source ↗

“Now I’ve had injectors 1 and 4 cause misfires and need to be replaced after about 3 months or so of driving with new ones.”source ↗

“The car has a noticeable hesitation accelerating from a stop or after slowing down and gets a little jumpy when pressing the gas”source ↗

“Been experiencing what I believe to be misfires when accelerating at about 3/4 - full throttle once I get to about 3000+rpm.”source ↗

“Have no check engine light on dash and when driving with an albeit cheap Bluetooth diagnostic scanner plugged in I’m not getting any diagnostic codes either”source ↗

“Had a similar thing on a 1.0 ecoboost, turned out to be a coil breaking down under load but fine at low revs. No codes either, which made it a pain to pin down.”source ↗

“Im currently dealing with an unknown engine issue and don't have the money to throw at a mechanic, so I need to learn how to go about finding and fixing this issue myself.”source ↗

“I need resources to know how to safely get the engine out and what the hell I'm looking at/for once it's on the stand.”source ↗

“started having issue for multiple months now and can’t seem to fix it would love some advice on what to do to fix it as it won’t accelerate over 55 and stay locked there when driving it”source ↗

“Had similar issue on my old 4.7, turned out the intake manifold gasket was leaking vacuum on that side.”source ↗

“I did swap coils and the code did not follow”source ↗

“P0300 is the constant code that persists”source ↗

“It has brand new plugs and coils the previous owner put on in an attempt to resolve the issue”source ↗

“After a few miles or minutes the check engine light comes on then flashes... flashes are associated with a little shaking (misfires?) and sometimes loss of acceleration responsiveness.”source ↗

“Hooking and OBD code reader shows that the first code to be thrown is P0154 (No activity for O2 sensor on Bank 2 Sensor 1), sometime after that P0016 and P0018 for Crankshaft/Cam correlation (both Banks) are thrown along with cylinder misfires P0300, P0302, P304.”source ↗

“As of a month ago, my 2007 Sienna LE has had trouble starting.”source ↗

“The shop I took it to told me I needed to replace all of the coils. I was just about to put an order in for said parts, but replacing coils and plugs on this van is a real hassle and im also kinda broke, so I decided to ask for a second opinion before throwing parts at the problem.”source ↗

“The codes seem to have went away, which makes me worry that the coils "fixed themselves " temporarily and therefore I won't be able to test them.”source ↗

“The problem is that it doesn't give a specific cylinder misfire, just a multiple/random misfire error.”source ↗

“If anyone has gone through a similar situation maybe you can offer some insight.”source ↗

“As stated i have a '17 Renegade with the 1.4 multiair turbo that is showing a p0300 code.”source ↗

“I have a 2004 expedition with the 5.4l 2v, and I've been chasing a misfire for about a week.”source ↗

“This time, it didnt trigger the CEL. It is an intermittent misfire. It runs fine, then has one big stumble at idle, and will start to misfire more at very low throttle inputs.”source ↗

“I'm growing really frustrated with this thing. I feel like as a mechanic I should know what to do, but I'm out of my wheelhouse right now.”source ↗

“I'm getting a P0304 – Cylinder 4 Misfire Detected error, but the strange thing is that the misfire doesn't happen consistently.”source ↗

“When I clear the error code using my diagnostic scanner (Xtool D7), the engine runs normally again, but the problem eventually returns.”source ↗

“Despite replacing these components, the intermittent cylinder 4 misfire continues.”source ↗

“Today after highway driving for about a half hour, the car started stumbling and running rough. CEL flashed.”source ↗

“I've sprayed carb cleaner all around the intake gasket and vacuum hoses, tried water as well, and a propane bottle, and nothing.”source ↗

“I am hearing a hiss hiss hiss hiss sound coming from the #4 runner where it meets the head.”source ↗

“Also, my valvetrain is rattling more than normal, as you can hear from the video above. This I think is new.”source ↗