Check Engine Light Codes Discussion

[wtcii]

Do you have a CEL light though?

[Jeff Likes Bagels]

however no CEL came on

Do you have a CEL light though?

Reading owns you, lol.

[NWINNIE34]

haha...

no CEL, however the maintenance required light is on full time

code read P2195....confused

[NWINNIE34]

http://wiki.answers.com/Q/Where_is_the_ ... a_Civic_DX
appears that its the o2 sensor in the header/downpipe... pretty sure i yanked a wire loose, that o2 sensor is not even 6 months old

but why maintenance light and not CEL ?

[wtcii]

I bet it is an old code then that didnt get cleared. maybe.... I dunno what I am talking about. Try clearing the code or resetting the ecu and see if it comes up again

[timot_one]

pretty sure i yanked a wire loose, that o2 sensor is not even 6 months old

Is this an assumption, or have you confirmed this?  Be careful that you don't misdiagnose something that ends up costing you money that you don't need to spend.  I'd double check that code you're getting though.

[Accord1234]

Anybody getting P0139. It's not on that long list of codes. Saying something about the O2 sensor. Any ideas?

[CrackerTeg]

Anybody getting P0139. It's not on that long list of codes. Saying something about the O2 sensor. Any ideas?

This is the part where you take these next steps I give you and follow them very closely.
1st: Take an empty bottle of Cuervo and fill it halfway with gasoline.
2nd: Stuff an oily rag into the bottle with about a third of it sticking out the bottle opening.
3rd: Light the oily rag with your choice of incendiary device.
4th: Throw the lit bottle at your car.
5th: Run away.
6th: Wait for the boom before you contact local authorities and tell them some hoodlums got into a gang fight.
7th: Buy a new car with the insurance payout.  


In all seriousness, here's what I dug up with a quick and dirty google search: Click me!
Is your car a J30 or K24? That may help us help you.

[b_beau_09]

I've had that code before, it's a stuck o2 sensor on the rear bank I believe (depending on which motor you have).  Try clearing the code first and seeing if it comes back. (I say that because that's what I did, and it never came back) If it does come back, you have a bad sensor or wire somewhere.  Check the wiring, and if it's fine, you probably need a new o2 sensor..then clear the code, you'll be good..

somebody correct me if I'm wrong here.. I'm never 100% positive on such things..

[Accord1234]

Ok thanks. Yea have the K24 model. First code I ever pulled on the car since I had it. All stock exhaust so I never touched any O2 sensors. The rear 02 I'm assuming is on the cat convertor.

[b_beau_09]

when I said rear bank, that's referring to the J30 rear bank of cylinders.. so I have no idea what it means on the k24..

[clapton924]

New code to add to the list:

P0420 "Catalyst Efficientcy Below Threshold, Bank 1"

This is the code I got from my check engine light being on. This is interesting because I had my cat converter replaced about a year ago. Anyone know if this means the cat converter is not functioning properly or is a sensor bad?

[timot_one]

It is probably your cat.  P0420 is the code I got after swapping out a high flow cat.  When I used a spark plug defouler, it fixed it.

[clapton924]

What is a spark plug defouler?

[wtcii]

It recesses the second O2 sensor causing it to read less gas because the way that it works is comparing the results from the 1st and 2nd O2 sensors.