How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ron Z. Your Own Question

Ron Z.
Ron Z., - Buick Tech -
Category: Buick
Satisfied Customers: 14880
Experience:  18+yrs experience. State Inspector and Buick Diagnostics
18617752
Type Your Buick Question Here...
Ron Z. is online now
A new question is answered every 9 seconds

Buick Century: Where is the O2 sensor heater fuse located for

Resolved Question:

Where is the O2 sensor heater fuse located for a Buick 2002 Century?
Submitted: 2 years ago.
Category: Buick
Expert:  Ron Z. replied 2 years ago.
Welcome! I'm Ron Z! Make sure to use Reply if needed! And PLEASE remember to RATE my answer at the end!

The fuse for the Oxygen Sensor heater is located in the underhood fuse block. It's fuse #29 (see image below). It should be labeled as "OXY SEN". If the fuse is good, make sure you have the correct Oxygen Sensor installed (OEM P/N: 12559850). If these all check ok, you will need to inspect the electrical connector and wire harness for any loose, broken or rubbed through wires that may be touching metal at some point.
graphic
Customer: replied 2 years ago.

You are gonna love this, but I am trying to feed a leaner signal with the Innovate LC-1 wideband sensor, but had to hook up the heater section of the old sensor dangling in the open in the engine component to keep the P0135 signal away. Running HHO trying to get better mileage. Its resistance seems to be one half the normal amount after a few months. (got wet?) I haven't checked the fuse yet but just in case, any possibility the PCM circuit got damaged? If so, would any similar GM model V6 same vintage PCM work without reprogramming?

Expert:  Ron Z. replied 2 years ago.
Yikes. Uhm. Probably a bit out of my league here, but... I'm going to say that the heater section of the old sensor "dangling" there isn't going to solve anything. If it DID get wet, then there's a chance hat maybe the PCM did take some damage. When replacing the PCM it needs to be the same numbers (when removed there's a sticker on top) and then will need to be re-programmed (no way around the programming, it needs to be done). At this point, if the fuse is good, go back to an original O2 sensor. If the problem persists, more than likely the problem is in the wiring or the PCM. If a new, original O2 solves the problem, try a more "efficient" way to improve fuel economy, like the "G-Force" chip. I think leaving that heater "dangling" is what got you into all this.
Ron Z., - Buick Tech -
Category: Buick
Satisfied Customers: 14880
Experience: 18+yrs experience. State Inspector and Buick Diagnostics
Ron Z. and 9 other Buick Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Buick Technician

    Satisfied Customers:

    1257
    15 years Buick Technician experience and training.
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Buick Technician

    Satisfied Customers:

    768
    15 years master GM tech and mater ASE tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Buick Master Technician

    Satisfied Customers:

    731
    ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    411
    ASE Master 15+years
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Buick Mechanic

    Satisfied Customers:

    393
    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg cartech's Avatar

    cartech

    ASE Certified Technician

    Satisfied Customers:

    307
    master tech automotive shop owner and tech 25 years
 
 
 
Chat Now With A Buick Mechanic
Ron Z.
Ron Z.
296 Satisfied Customers
18+yrs experience. State Inspector and Buick Diagnostics