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Unread 10-10-2013, 08:12 AM   #1
jsipe007
Registered User
1994 YJ Wrangler 
 
Join Date: Oct 2011
Location: Reno, Nevada
Posts: 453
YJ CEL Code 52

Hey guys, driving home from work yesterday, I got a CEL. I pulled the codes to find I was getting a Code 52 (O2 detects rich mixture). When I get the time, I will hop under and check all my return lines; I have heard this could be the culprit. Any other suggestions? I did not get a CEL on my way to work this morning but I will check on my way home.

I know my rubber lines are getting fairly old near the tank. I replaced all the lines around the fuel filter but have yet to do the lines from the tank. I am planning to replace those lines when I drop the tank to install my rear bumper.

Thanks!

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Unread 10-10-2013, 08:20 AM   #2
sprngrider
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1994 YJ Wrangler 
 
Join Date: Feb 2007
Location: san diego
Posts: 829
The o2 could be bad, or it could be a fluke. Try a reset.
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Unread 10-10-2013, 08:58 AM   #3
jsipe007
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1994 YJ Wrangler 
 
Join Date: Oct 2011
Location: Reno, Nevada
Posts: 453
Will do. I dont believe the o2 is bad, sorry I didnt include much background info. I replaced the o2 with an NGK about a month ago. I will see if the problem returns but the code cleared itself after and engine restart. It does sometimes appear to be running rich, I will occasionally get a slight backfire after letting off the gas when under power
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Unread 10-10-2013, 09:13 AM   #4
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,737
You need to run a fuel pressure test any time you have a rich reading from the O2 sensor. 31 psi at idle, 39 psi with the vacuum line to the regulator removed. reconnect the vacuum line then turn the ignition off and you should see a reading greater then 20 psi for longer then 20 minutes. Each one tells you a diffferent potential issue. Post back what you find.
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Unread 10-10-2013, 10:18 AM   #5
jsipe007
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1994 YJ Wrangler 
 
Join Date: Oct 2011
Location: Reno, Nevada
Posts: 453
Thanks Que! Really glad to have you back!

Ill run down to the auto parts store and rent one when I get the opportunity.
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