Any tips on Oxygen Sensor Heating circuit? - Page 2 - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace



Go Back   Focus Fanatics > Ford Focus SVT > SVT Performance (2002-2004)

SVT Performance (2002-2004) The place to chat about any 2.0L SVT DOHC Zetec engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
FocusFest Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 03-05-2012, 03:25 PM   #11
6SPD_soul
Focus Addict
 
6SPD_soul's Avatar
 
Join Date: Feb 2008
Fan#: 53637
Location: Soldiers Grove, WI
What I Drive: 2003 Comp Orange EAP SVT

Posts: 1,468
FF Reputation: 24 6SPD_soul Great Standing Member
Buy-Sell-Trade Rating: (1)
Quote:
Originally Posted by jmoryl View Post
Since I had a new front sensor (Ford) sitting around and the car has about 90k miles, I changed that sensor, expecting that would at least clear the P0135. No such luck.
Thanks in advance.
Did you yourself actually clear the current codes after replacing that sensor?That code won't go away by itself for quite awhile, even if the fault is repaired.
6SPD_soul is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 03-06-2012, 01:29 PM   #12
jmoryl
Focus Rookie
 
Join Date: Sep 2007
Fan#: 50300
Location: New Jersey
What I Drive: 2003 SVT Focus (silver)

Posts: 24
FF Reputation: 1 jmoryl Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by Grinder View Post
It's possible to meausure the current flow through the heaters but it's a tricky measurement to set up and the heaters are duty cycled controlled which will mess with your readings.

If both heater circuit codes are set, something common between the two sensors is your problem. The only thing common is the power circuit and the PCM. I agree, it's not likely the PCM but it is possible and this type of scenario is one of the common causes of their uncommon failure....

Are you SURE the fuse is good?
I've made some progress. After installing a new front sensor and getting the same codes, I'm down to one code, P0141, after several read/clear/CEL cycles. Funny how these things work sometime. So it looks like I'll just replace the rear sensor now. The SOB is bent, so it looks like it will be a hassle to remove - anyone have any experience to share?
jmoryl is offline  
    Reply With Quote
Old 03-06-2012, 01:55 PM   #13
Grinder
Banned
 
Join Date: May 2011
Fan#: 85627
Location: Minneapolis, MN
What I Drive: 2003 CD silver SVT

Posts: 497
FF Reputation: 10 Grinder Great Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by jmoryl View Post
I've made some progress. After installing a new front sensor and getting the same codes, I'm down to one code, P0141, after several read/clear/CEL cycles. Funny how these things work sometime. So it looks like I'll just replace the rear sensor now. The SOB is bent, so it looks like it will be a hassle to remove - anyone have any experience to share?
This is common.

When you bottom the header out it flexes enough to smash the sensors against the engine/halfshaft. This bends the sensors and shorts the heating element to the body of the sensor. This will blow the fuse that is common between both sensor's power circuit and you end up with heater circuit codes.

When the PCM is bad it sets codes for both sensors all the time. So... if you're only setting the code for the rear - the heater element/circuity inside the sensor is toast. Replace the rear sensor and you should be good to go.

Make sure you bring your old sensor into the parts store to match it up. All parts stores categorize 02 sensors based on the element design and pigtail harness length. Autozone, Orielly, Napa, CarQuest and Pep Boys all show the incorrect length of pigtail for the rear sensor (at least for my SVT). I had to ziptie a crapload of extra harness because I couldn't find a direct replacement...
Grinder is offline  
    Reply With Quote
Old 03-08-2012, 05:45 PM   #14
jmoryl
Focus Rookie
 
Join Date: Sep 2007
Fan#: 50300
Location: New Jersey
What I Drive: 2003 SVT Focus (silver)

Posts: 24
FF Reputation: 1 jmoryl Good Standing Member
Buy-Sell-Trade Rating: (0)
Thanks. I'm getting a Motorcraft sensor from Steve at Tousley, so I think I'll be OK there.
jmoryl is offline  
    Reply With Quote
Old 03-09-2012, 10:13 AM   #15
SonicPDX
Focus Enthusiast
 
SonicPDX's Avatar
 
Join Date: Mar 2011
Fan#: 84411
Location: Portland, OR
What I Drive: (2) 2oo2 SVTF One Sonic, One Red

Posts: 91
FF Reputation: 1 SonicPDX Good Standing Member
Buy-Sell-Trade Rating: (0)
I would enquire as to what sensor you replaced it with? Factory Motorcraft is my recommendation. I have had many issues with the Bosch/NTK and other aftermarket ones. Steve at Tousley got me the sensors at a reasonable price. $74 and $64 if I recall correctly.
SonicPDX is offline  
    Reply With Quote
Old 10-27-2012, 11:34 PM   #16
matmatician
Cars&Corgis
 
matmatician's Avatar
 
Join Date: Dec 2010
Fan#: 81361
Location: Mill Creek, WA
What I Drive: A ONE COLOR FOCUS, Ducatis

Posts: 4,361
FF Reputation: 4 matmatician Good Standing Member
Buy-Sell-Trade Rating: (1)
Quote:
Originally Posted by SonicPDX View Post
I would enquire as to what sensor you replaced it with? Factory Motorcraft is my recommendation. I have had many issues with the Bosch/NTK and other aftermarket ones. Steve at Tousley got me the sensors at a reasonable price. $74 and $64 if I recall correctly.
Sorry to revive the thread, but what kind of issues did you have with the Bosch one? I just picked one up and would like to return it before I install it if its anything serious.
__________________
Quote:
Originally Posted by matmatician View Post
What spare tire? The one that adds weight? Psh. Its wherever my A/C is.
ROTM June '13, PNW Crew #42, SR #245, Rally Rev #02
matmatician is online now  
    Reply With Quote
Old 10-28-2012, 08:24 PM   #17
qweesy
Focus Addict
 
qweesy's Avatar
 
Join Date: Aug 2004
Fan#: 12042
Location: Houston, TX
What I Drive: 2004 focus Duratec 2.3 RS (DEAD)

Posts: 1,154
FF Reputation: 3 qweesy Good Standing Member
Buy-Sell-Trade Rating: (6)
Bosch O2 sensors are crap and you will have problems either go with OEM ford or Denso Ive had no problems with them.
qweesy is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

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 On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:44 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.