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Forum » MISC MECHANICS: Check engine light suddenly appeared this morning...
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Thread: MISC MECHANICS: Check engine light suddenly appeared this morning...

post 1680966163 04-17-2023, 08:20 AM
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MISC MECHANICS: Check engine light suddenly appeared this morning...

My car is a 2004 Toyota Matrix with 200k miles.

So a month or two ago I had the O2 sensor and battery replaced. Everything was good. Last week I replaced the relay for the AC myself, because my AC wasn't working. Everything seemed fine and the AC has been working since. But just this morning I noticed my check engine light is on.

Could this have something to do with the relay I replaced? The car seems to be running totally fine. I'm confused as sh!t.
post 1680966193 04-17-2023, 08:21 AM
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so get a fckin car reader and see what's causing it you fckin moron.

do you need someone to hold your hand?
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post 1680966243 04-17-2023, 08:22 AM
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code reader costs like 20 bucks man.

some cars have a system that will display the code if you do a sequence of functions on your steering wheel/dash control.

If neither of those are achievable, just go to your closest auto parts retailer and they will read it for free. takes 30 seconds.


I would not sweat it too bad if you do not have symptoms or any other indications. Look at it, but don't freak out or anything.
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post 1680966293 04-17-2023, 08:23 AM
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The tranny is right but he was definitely a dick about it. Probably needs his daily dose of estrogen.
Scan it. A lot of times new O2 sensors go out so don’t be surprised to see the same code. Downside of cheap parts
Sloots Gon Sloot.
post 1680966393 04-17-2023, 08:24 AM
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Those sensors have a knack for all failing about the same time. Probabaly a completely different sensor you've got to change now.
#
post 1680966423 04-17-2023, 08:25 AM
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^^ Fukn Mario wants you to get a "car reader".... U WUT M8?

OP, most major auto parts stores (Advanced, Auto Zone) will check the codes for you for free. Take it there and see what the code is and report back.
post 1680966463 04-17-2023, 08:26 AM
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Could also be because you replaced the battery. Get an OBD2 reader, check what the fault is, if it's emissions then clear the code and see if it comes back.
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post 1680966533 04-17-2023, 08:27 AM
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also i had a corolla and the check came on because of the gas cap.

check your gas cap
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post 1680966543 04-17-2023, 08:27 AM
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A 20 dollar code reader is worth more than the car
post 1680966563 04-17-2023, 08:27 AM
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Originally Posted By 300Lane1⏩
^^ Fukn Mario wants you to get a "car reader".... U WUT M8?

OP, most major auto parts stores (Advanced, Auto Zone) will check the codes for you for free. Take it there and see what the code is and report back.
You can get a code reader for like 10 bucks. Stop being a Jew and just buy one OP, it will pay for itself in time saved and less hassle
post 1680966593 04-17-2023, 08:28 AM
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Take to auto parts store so they can check the code.
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post 1680966613 04-17-2023, 08:28 AM
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Protip: OP, you gonna have to google the code after you get it. Just google "2004 Matrix CEL Code PXXXX"

The X is where you will put the four digit code you get.

It will bring you right to some forum where people talk about what leads to that cause and how to fix it.

If you are not confident in your abilities for what should be an easy task (replacing an O2 sensor), just youtube it man. You can do whatever you need to on that car.
“The stories and information posted here are artistic works of fiction and falsehood. Only a fool would take anything posted here as fact.“

PS: Don't eat poop, just don't let the idea of it stop you from living life to its fullest.
post 1680967433 04-17-2023, 08:43 AM
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That light means you can drive it at least another 50k before doing anything.
libs gonna lib
post 1680967713 04-17-2023, 08:48 AM
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I have multiple scanners but use this one the most. First thing i always do is just erase all codes and see if it even comes back. I’ve seen codes throw just because you held the key on too long when starting or not long enough and it misfires. Otherwise you are just chasing a problem that doesn’t even exist.

https://www.amazon.com/Autel-MS309-U...%2C152&sr=8-12
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post 1680967913 04-17-2023, 08:51 AM
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Originally Posted By LiveLaughLoath⏩
My car is a 2004 Toyota Matrix with 200k miles.

So a month or two ago I had the O2 sensor and battery replaced. Everything was good. Last week I replaced the relay for the AC myself, because my AC wasn't working. Everything seemed fine and the AC has been working since. But just this morning I noticed my check engine light is on.

Could this have something to do with the relay I replaced? The car seems to be running totally fine. I'm confused as sh!t.
Drive to Autozone, ask them to scan your car for you. Start there.
post 1680968083 04-17-2023, 08:53 AM
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Hmmmmm have you tried checking the engine?
post 1680968313 04-17-2023, 08:57 AM
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Originally Posted By Anachron⏩
How do beavercels decide which dog to stick the scanner in?
Whichever one is idling ruff
post 1680968573 04-17-2023, 09:02 AM
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Originally Posted By MarioMiami305⏩
so get a fckin car reader and see what's causing it you fckin moron.

do you need someone to hold your hand?
oh lawd, this.

Code readers are like $20 on amazon nowadays. Or leave it at the dealer ship for a day for a $300 diagnostic and estimate.
post 1680969043 04-17-2023, 09:11 AM
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Get a new car
Losers let it happen, winners make it happen.

Nonsense Army Crew.
post 1680969473 04-17-2023, 09:19 AM
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Do 2004 cars even have codes? Probably need a punch card reader
post 1680975123 04-17-2023, 10:43 AM
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So I got the code checked. It said it's P0456 - very small evaporative leak. Gas cap seems fine. Any ideas?
post 1680975273 04-17-2023, 10:44 AM
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Originally Posted By Destor⏩
Do 2004 cars even have codes? Probably need a punch card reader
You momma’s car so old the code is 0001
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post 1680975413 04-17-2023, 10:46 AM
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Originally Posted By LiveLaughLoath⏩
So I got the code checked. It said it's P0456 - very small evaporative leak. Gas cap seems fine. Any ideas?
Just clear it and see if it comes back.

If it comes back check purge valve.
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post 1680975793 04-17-2023, 10:52 AM
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Originally Posted By cobhc⏩
Just clear it and see if it comes back.

If it comes back check purge valve.
If cobhc was a code scanner he’d be cOBD2hc
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post 1680976003 04-17-2023, 10:54 AM
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Originally Posted By desslok⏩
If cobhc was a code scanner he’d be cOBD2hc
Lmao, love you bro.
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post 1680976973 04-17-2023, 11:07 AM
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Originally Posted By cobhc⏩
Just clear it and see if it comes back.

If it comes back check purge valve.
Thanks for the info. How much would (or should) this cost to fix if I take it in?

Also, how long can I wait before having this fixed?
post 1680977113 04-17-2023, 11:09 AM
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Originally Posted By LiveLaughLoath⏩
Thanks for the info. How much would (or should) this cost to fix if I take it in?

Also, how long can I wait before having this fixed?
Not much - worst case scenario 2 hours of labor and the part is cheap (if that's the issue)

As long as you want until your next inspection. It's not going to ruin your car.
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post 1680977563 04-17-2023, 11:16 AM
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Originally Posted By cobhc⏩
Not much - worst case scenario 2 hours of labor and the part is cheap (if that's the issue)

As long as you want until your next inspection. It's not going to ruin your car.
Awesome thanks brah. I'm trying to wait until my next oil change, which is ~2k more miles, so I can get the oil changed, new tires, and this taken care of.
post 1680978163 04-17-2023, 11:24 AM
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Originally Posted By LiveLaughLoath⏩
Awesome thanks brah. I'm trying to wait until my next oil change, which is ~2k more miles, so I can get the oil changed, new tires, and this taken care of.
Np

You can let them diagnose it. If it is the valve, chances are you can youtube and do it yourself pretty easily. For most cars it's an easy swap.
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post 1680978763 04-17-2023, 11:35 AM
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Tighten the nut behind the wheel
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