Check Engine Light
Thread Starter
Registered User
Joined: Jun 2003
Posts: 82
From: NJ, USA
Car Info: 2004 WRX Sedan
Rear O2 Sensor Failure
My rear O2 sensor is bad. The dealer ordered a new one. Should be fixed in two weeks.
CEL Code:
P0139 - 02 SENSOR CIRCUT SLOW RESPONSE (BANK 1 SENSOR 1)
CEL Code:
P0139 - 02 SENSOR CIRCUT SLOW RESPONSE (BANK 1 SENSOR 1)
Last edited by Chris04WRX; Jun 24, 2003 at 01:48 PM.
Thread Starter
Registered User
Joined: Jun 2003
Posts: 82
From: NJ, USA
Car Info: 2004 WRX Sedan
Do you have an '04? The guy at the dealership told me that a number of replacement rear O2 sensors were failing in the previous model years. I guess there is a history of O2 sensor problems with the WRX.
Originally posted by TopKatz
yup...thats what mine was
takes 1 hour to fix because they have to let the exhaust cool.
yup...thats what mine was
takes 1 hour to fix because they have to let the exhaust cool.
STRAIGHT PIPE GOOD.. CEL BAD..ANY IDEAS?
Registered User
Joined: Apr 2003
Posts: 1,013
From: california, LOS ANGELES
Car Info: dream car Subaru STi
straight pipe
yea, my friend had a 2000 type R and when he got his straight pipe, his chek engine light came on due to his o2 sensors, so if i got a straight pipe on my WRX im sure the check engine light would go on, what to do to make the CEL not go on and still use the straight pipe effectively?
by the way, wat is the point of the o2 sensors? is it to maintain pollution?
by the way, wat is the point of the o2 sensors? is it to maintain pollution?
Thread Starter
Registered User
Joined: Jun 2003
Posts: 82
From: NJ, USA
Car Info: 2004 WRX Sedan
Mine is getting replaced on Monday. Interesting thing is, the CEL hasn't come on for 600 miles since the problem was diagnosed.
Originally posted by links_courses
I have a 2004 WRX. Same light - it was the REAR O2 SENSOR. No charge - 2 hour wait. Good luck.
I have a 2004 WRX. Same light - it was the REAR O2 SENSOR. No charge - 2 hour wait. Good luck.
Guest
Posts: n/a
Regarding your Oxygen Sensors. Generally the front Sensor gives feedback to the PCM for fuel control and the rear one monitors CAT efficiency. Usually once the light comes on you are in a backup or limp mode, thus not getting full performance. Not aware of any work-around myself.
Registered User
Joined: Apr 2003
Posts: 1,013
From: california, LOS ANGELES
Car Info: dream car Subaru STi
ok i have this problem then.. on my 04 WRX, the 3 cats are totally restricting my mid and high end power, i need to get an exhaust system but wont my o2 sensors come on?? what should i do.?
please, i need expert opinion.
please, i need expert opinion.
Guest
Posts: n/a
i had a similar problem with my 02 wrx dealer said was loose gas cap...wasnt.....he tried to tell me that the clicking noise when you put on a gas cap didnt mean any thing( really clicking noise is a torque limiter) anyway it turned out to be a small fuel leak..got it fixed after 3 trips to dealer and no problems since
Thread
Thread Starter
Forum
Replies
Last Post
06scooby
Suby Shopping & Maintenance/Warranty
1
Oct 15, 2006 10:11 AM
rash
Engine/Power - EJ20T (pre-2006 WRX and JDM)
10
May 17, 2003 12:32 PM
