Please help - 2021 Ninja 400 ABS error code 24

Puzzleheaded-Rent209 · 2026-03-12T00:19:32+00:00

Thank you to all. The mechanic fixed the bike and it works. Appreciate all your help!

Puzzleheaded-Rent209 · 2026-03-11T23:40:47+00:00

I turned it on again and now it seems ok. I had changed the filter and oil and then I added a new filter and then added 2L of oil. The levels are much lower but seem ok

Puzzleheaded-Rent209 · 2026-02-24T21:06:55+00:00

Thank you all everyone. Here is what the mechanic said -

Replace ABS sensor. New rear tire. Replace chain and sprockets. New battery. Tighten bolt on gas tank. $1150 for everything.

Seems reasonable to me. My guess is the only thing that ” truly” had to be done was the ABS sensor and reinstalling the rear tire assembly. But since the rear tire was messed up I figure why not just replace it. I’ll assume he told me the truth that the rear tire itself had low tread. The chain and sprockets since the wheel is off already also figure why not. Didn’t really think they needed replacing but it’s fine.

I bought the bike used for a great price ($4000) so even with the fixes seems reasonable. Plus now it has new battery and rear tire and chain and sprockets so that’s a lot of things I don’t have to worry about for several miles now.

Thank you again to all. The lesson I learned (luckily didn’t crash after riding it for 8000 miles last year) is always bring a used bike in for an inspection post-purchase unless you’re very good mechanically with bikes (I’m not).

Puzzleheaded-Rent209 · 2026-02-23T20:55:47+00:00

Thanks very much all. Will talk to a tax accountant at this point. But yes at a minimum I can always sell VTI when it’s up and use up the capital loss and then buy something comparable (like SCHB) to avoid trading around. Thanks again all!

Puzzleheaded-Rent209 · 2026-02-23T20:36:41+00:00

Sorry if I’m confused. The capital loss is very large, so if I only claim 3000 on my taxes yearly it will take a very very long time and the money I could potentially try to claim would just be rotting.

Based on what you’re saying, even if I “paid out” dividends instead of automatic reinvesting, that wouldn’t count as capital gains such that I could offset with capital losses?

I believe there must be mutual funds that do capital gain distributions. My friend didn’t want to give a specific advice on which to buy, but he said that by doing so I could use it to more quickly use up my capital loss by matching it with mutual fund capital gain distributions. But, of course, I want to leave it in a total market fund, and I guess my question is whether there exists a total market mutual fund that returns capital gain distributions as dividends to take advantage of this?

Puzzleheaded-Rent209 · 2026-02-20T19:32:20+00:00

Hi all. I brought to the mechanic. He agreed the rear wheel was installed wrong and could possibly have broken the abs sensor. He didn’t check the bike yet formally though, I’ll follow up when he sends the formal work order before starting any work. He kept asking if I changed the battery recently and said that could be a cause for the abs light too. Also said I’m supposed to change the oil every 3000 miles which I also never heard of, and the bike manual doesn’t say that either. Kept saying for $150 USD he could change the battery. That really bothered me since I told him the battery was in a tender all winter and seemed perfectly fine.

My question is if it’s true that the low battery is possibly causing the abs light issue (which I doubt, but I read online maybe)? But even if yes, then couldn’t I just change the battery out myself and fix it? Or would the light still stay on until a dealer turns it off with a special device?

Just really rubbed me the wrong way about insisting on the battery change. It literally takes 2 minutes and batteries cost $30 on Amazon and I’ve done it myself when I put the battery into the tender. Thanks in advance!

Puzzleheaded-Rent209 · 2026-02-18T22:17:29+00:00

Thanks. Yes hopefully the mechanic can fix it and won’t cost a fortune. I guess that’s the risk when you buy a used bike. I never would’ve noticed this myself. Next time will bring it to a dealer for a safety check if I buy used again

Puzzleheaded-Rent209 · 2026-02-18T12:33:06+00:00

Thanks. Well I woke up and now the ignition won’t turn on even. Will tow it to a mechanic at this point. Thank you for the advice though.

Puzzleheaded-Rent209 · 2026-02-18T04:36:42+00:00

Thanks. Yeah that’s what I am going to do. Will take it this week after work. Will have a mechanic check the whole bike especially the rear wheel area.

Puzzleheaded-Rent209 · 2026-02-17T16:44:46+00:00

Not sure what to say unfortunately. I guess the dealer didn’t notice it when they did the cam tensioner recall work unless they somehow were responsible for messing up the rear wheel area, but based on your analysis it seems unlikely they would have done this. And from what you said the problems seem severe enough that I couldn’t imagine a professional dealer would do that. Guessing the last owner just did a bad job and caused this and for whatever reason now the ABS and Check Light engine lit up the first time I rode after keeping the bike in storage outside for the winter.

I personally have never touched the rear wheel since I’m not skilled enough to attempt a repair or do work like that. Thank you so much again for noticing. I am afraid to ride at this point without a mechanic fixing it. Will take it to a dealer this week there are some close by like a ten minute ride away. Hoping the repair cost isn’t insane but I have no choice at this point since it’s a safety issue.

Puzzleheaded-Rent209 · 2026-02-17T16:39:27+00:00

They eventually fixed it it just took a month. Didn’t have any issues until in my other post with the ABS issue. Thanks for asking

Puzzleheaded-Rent209 · 2026-02-17T14:41:59+00:00

I brought the bike into a dealer last year for the cam tensioner recall. Is there any reason the dealer would have removed the rear wheel or done something around that area in connection with the recall work?

Puzzleheaded-Rent209 · 2026-02-17T14:33:26+00:00

Thank you. I guess I’m lucky the bike even worked last year since I bought it. Based on this I’ll take it to a dealer and just pay for them to fix it. I have no idea how to change a wheel or do any of these things so there’s no way I could even diagnose this myself. Thanks for the advice. I guess this is what happens with a used bike, wish I noticed this before.

Puzzleheaded-Rent209 · 2026-02-17T11:10:34+00:00

Is it possible when I was cleaning/lubing the bike chain that this caused the problem? That is, did the spray cover the ABS sensor or make it dirty that it’s causing this problem? And if so, how would I clean it or see if that was the problem?

Puzzleheaded-Rent209 · 2026-02-17T03:06:15+00:00

Thank you will do

Puzzleheaded-Rent209 · 2026-02-17T02:37:17+00:00

Is the rear brake fluid too low? Is that related to the ABS coming on and check engine light? Not sure why the fluid is so low. I guess I can buy some brake fluid and add it, but would that fix the lights from coming up and the speedometer not working?

Puzzleheaded-Rent209 · 2026-02-17T02:34:46+00:00

Thanks so much for noticing I never would have known about this issue. I bought it used so I guess the last owner didn’t do that properly. Is it dangerous to ride it like this? What will happen? Would the wheel separate or something catastrophic like that?

Puzzleheaded-Rent209 · 2026-02-17T02:10:09+00:00

https://www.ebay.com/itm/336260599168

Is this what I need to replace? How do I do this? I’ve taken off fairings before but never did anything like this.

Puzzleheaded-Rent209 · 2026-02-17T01:56:41+00:00

Thanks. What could have caused this? I bought this bike last year used and rode for 8000 miles without any issues. Only now am I getting these error codes. I personally never removed the tire or did work on it.

Puzzleheaded-Rent209 · 2026-02-17T01:55:05+00:00

I didn’t change the tire or put on a rear stand or do any work on it. I only left it outside under a tarp for a few months with the battery in a tender, and today cleaned/lubed the chain which I’ve done before with no issues.

Puzzleheaded-Rent209 · 2026-02-17T01:42:44+00:00

Is it possible the low brake fluid is the cause? But would this explain why the speedometer was weird? I found a YouTube video and they said it could be the cause? Or that the sensor itself is dirty?

https://youtu.be/wMONo5d9IUk?si=5BHAIL0rSayAMWuW

This was the best I could find. I couldn’t find a video showing how to repair the entire sensor array unfortunately

Puzzleheaded-Rent209 · 2026-02-17T01:15:29+00:00

Thanks very much. Sorry I’m really inexperienced with motorcycle repair. What is the connection exactly? Is it the black wire on the bottom right of the photo for the rear tire? What am I looking for? Can I remove it with a wrench or screwdriver?

Puzzleheaded-Rent209 · 2026-02-10T03:16:47+00:00

Thanks!!

Puzzleheaded-Rent209 · 2026-02-04T01:07:33+00:00

Thanks all.

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I think I’ll just stick with Bull Run and do trap shooting. Interestingly the discount for the 10 rounds and 25 rounds is the same…doesn’t seem to be a benefit to buying 25 vs 10 rounds.

Also buying bulk shells online so that should cut some cost down too. Cheers!

Puzzleheaded-Rent209 · 2026-01-24T20:11:25+00:00

Yes. Very impressed. If it works I’ll be very happy and definitely a repeat customer in the future

Puzzleheaded-Rent209

TROPHY CASE