p0139 on completely stock 04 wrx - Subaru WRX Forum
 
LinkBack Thread Tools Display Modes
#1 Old 01-12-2010, 02:43 AM
WRXtuners Member
 
Join Date: Jan 2010
Location: Washington
Posts: 2
04_rex_wag is an unknown
p0139 on completely stock 04 wrx

I have read all the threads about all the notorious codes, but I have a completely stock 04 wrx wagon. No catless downpipe, no catback, no intake. I have replaced the O2 sensor and p0139 still comes back. Now it only comes on every once in a while. But when it does, it will stay on for a day or more and then go dormant for a few days. I could just ignore it if it does no harm or doesn't rob power. Any thoughts?
04_rex_wag is offline  
Sponsored Links
Advertisement
 
#2 Old 01-19-2010, 03:09 PM
WRXtuners Member
 
Join Date: Jan 2010
Location: North Carolina
Posts: 12
busadave is an unknown
hEY 04 REX,THERE IS A SUBARU REPROGRAM FOR P0139 DUE TO SPARK KNOCK,MAYBE YOU HAVE A FUEL QUALITY ISSUE OR TOO LOW A OCTANE...THE SPARK KNOCK MAY NOT BE HEARD BUT THE ECU IS CATCHING IT.I SUGGEST A REPROGRAM AND DOUBLE CK FOR ANY VACUUM LEAKS THAT COULD LET FRESH AIR IN AND SLOW THE RESPONSE OF THE REAR O2 FROM RICH TO LEAN OR VICE VERSA.GOOD LUCK!
busadave is offline  
#3 Old 01-20-2010, 12:24 AM
WRXtuners Member
 
Join Date: Jan 2010
Location: Washington
Posts: 2
04_rex_wag is an unknown
p0139

So to do this, do I have to go get it tuned or is it a dealership issue? I run 92 octane all the time and use additives every once in a while. And a vacuum leak is possible. I noticed shortly after I bought the car I found a short piece of vacuum hose just sitting in the engine compartment, and on the end of it there was a (pistol) reducer. I didn't know what it was for but it wasn't connected to anything and it didn't seem to affect anything.
04_rex_wag is offline  
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On