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Subject: "Code 51" Previous topic | Next topic
sheldonFeb-20-04 12:07 AM
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#68865, "Code 51"
Feb-20-04 12:53 AM by sheldon

          

I got this code this morning while my car was warming up and I wanted to know what does it mean when it says that the O2 sensor is heated? Also, how do I check to see if I have a bad injector. I've had this error pop up before but it's been a good 5 months since I've seen it.


EDIT: Ok, I'm not woke yet, forget the comment about the O2 sensor, eventhough that could be the problem. Do any of you think it may be because I have 2 units tapped into the O2 signal?(A/F guage and Venom A/F guage)

  

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Replies to this topic
RE: Code 51, MmmDeion, Feb-20-04 05:55 AM, #1
RE: Code 51, sheldon, Feb-20-04 06:39 AM, #2
      RE: Code 51, DSMRoadster, Feb-20-04 05:21 PM, #3
           RE: Code 51, sheldon, Feb-21-04 12:27 AM, #4
                RE: Code 51, InFiNiT3, Feb-22-04 07:21 PM, #5
RE: Code 51, WickedESi, Feb-22-04 08:50 PM, #6

MmmDeionFeb-20-04 05:55 AM
Member since Dec 11th 2002
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#68883, "RE: Code 51"
In response to Reply # 0


          

I had this code just the other day, but that is because someone messed with my SAFC when I let them borrow my car. I have stock injectors and they set the Hi-Throttle percentages at -10% across the board, causing my engine to lean right the hell out. Do you have an S-AFC, and if so, what are your settings? What I would do is first go buy some injector cleaner for like $3.00 from Pep Boys, and see if that helps. Prob not, but atleast its worth a shot. Also, the heated 02 sensor means that your 02 sensor is going bad. But whatever the problem is I would check all fuel fittings, injectors, FPRs, etc. Are you turbo, if so, whats your turbo and fuel setup?


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sheldonFeb-20-04 06:39 AM
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#68885, "RE: Code 51"
In response to Reply # 1


          

I'm not turbo and I don't have an AFC. The problem is weird becuase it is very sporadic when it pops up. I can clear the cel and it won't pop back up for atleast a couple months or so. I've tried the injector cleaner before but that didn't seem to help. My fuel filter isn't that old either so I don't think that's getting clogged. The only time I get the CEL is when the car is warming up or idling. It never pops up while I'm driving. Does anyone else have any ideas or things I can check?

  

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DSMRoadsterFeb-20-04 05:21 PM
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#68932, "RE: Code 51"
In response to Reply # 2




          

that is a lean a/f mixture code. It's all fuel related. Get a mech stethoscope to see if you're injectors are firing alright.

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sheldonFeb-21-04 12:27 AM
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#68945, "RE: Code 51"
In response to Reply # 3


          

ok, thanks. I didn't think about checking them that way. Anyone else have any ideas? I reset the ecu last night and of course it hasn't came back yet. It'll probably wait until I go to get it inspected on Monday to come back.

  

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InFiNiT3Feb-22-04 07:21 PM
Member since Sep 01st 2002
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#69059, "RE: Code 51"
In response to Reply # 4


          

aye bro... go down to autozone and get an fuel/vacume pressure gouge.. its around 30$... check your fuel pressure b4 the injectors..(ie:fuel rail back) this will narrow your search... also depending on the milalge you might wanna use that vaccume gauge to check out the mechanical condition of the car... its a diagnostic toll for 30$. (it will show u how in the packaging)

jake
ps
how is the HC level comming out of the exhast (after cat)



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WickedESiFeb-22-04 08:50 PM
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#69065, "RE: Code 51"
In response to Reply # 0




          

Originally posted by sheldon
I wanted to know what does it mean when it says that the O2 sensor is heated?

We have heated O2 sensors on our car meaning the O2 sensor has a heating filiment inside it that will bring the O2 sensor to proper operating temperture regardless if the engine is warmed up yet, etc...


Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

  

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