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 Your Own Question

Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 27595
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
7276279
Type Your Ford Question Here...
Ron is online now
A new question is answered every 9 seconds

1996 Ford Thunderbird: he 4.6l V8..OBDII..O2 sensors

Resolved Question:

My son has a 1996 Ford Thunderbird witht he 4.6l V8. The OBDII reader shows all four O2 sensors. Not likely the case. My sons put new O2 sensors in and still the check engine light comes on. Turns out that he isn't getting any power to all four O2 sensors. All the fuses (especially #s 15 and 3) check out fine. Is there a main fuse for the O2 sensors located somewhere else? Could this be a relay or (heaven forbid) the main computer? My son is trying to fix this on a limited budget so please help. Thanks.
Submitted: 6 years ago.
Category: Ford
Expert:  Ron replied 6 years ago.

HiCustomer Thank you for asking your question on Just Answer.

Can you tell me the code your getting?

Customer: replied 6 years ago.
Reply to Ron's Post: You mean the OBDII code? If so my other son did this at the auto parts store weeks ago. I would need to check with him but he told me the code read that the O2 sensors are bad. I've got to run home and will probably need to contact you later.
Expert:  Ron replied 6 years ago.
Ok if you can get me the code or codes I help you figure this out. Just return to this question as its not likely the HO2Ss are bad.Im Dont hit accept till we figure this out.
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 27595
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Ron and 6 other Ford Specialists are ready to help you
Customer: replied 6 years ago.
I heard back from the mechanic and he said the OBDII codes are PO135, PO141, PO155 and PO161 which apparently are heater short faults.
Expert:  Ron replied 6 years ago.

HiCustomer

Thank you for asking your question on Just Answer. In most case when you have this combonation of code you likely looking at a bad PCM (computer)

Check resistance of the heater circuits from Powertrain Control Module (PCM) connector pin 71 or 97 to pin 93, 94, 95, 96 and resistance should be 3-30 ohms. Then turn the key on, all for heater control pins (93, 94, 95, 96) should have battery voltage. If so, using an ammeter, ground each pin one at a time to energize the heaters and check their amp draw. The amp draw per heater should be 4A or less and should start to drop as the heater heats up. If all heater circuit checks are OK, replace the PCM

The PCM is located behind the passenger side kick panel inside the car.

Customer: replied 6 years ago.
I should find out more today. Don't worry, I won't forget about you. I just don't have the car right now and the mechanic will be checking on your suggestions.
Expert:  Ron replied 6 years ago.
No problem, just let me know .
Customer: replied 6 years ago.
The mechanic who has the car wants to make sure that the power loss to the O2 sensors isn't a relay or something else. He was trying to track down where the relay is. Also, he thought there might be a master fuse or something.
Customer: replied 6 years ago.
Is there a master fuse or a relay that might be the source of the power loss?
Expert:  Ron replied 6 years ago.
Yes the power comes from the PCM relay(powertrain control) relay in the LH fuse panel in the Engine compartment.
Customer: replied 6 years ago.
Is that something that can be replaced?
Expert:  Ron replied 6 years ago.
If it was bad the engine would not even run. Have him run the test I sent.

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:

 
 
 
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
< Last | Next >
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
  • Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me. Molly USA
  • I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service. Jason V. Kirkland, WA
  • I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there. BR New Jersey
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Ford Technician

    Satisfied Customers:

    22382
    16 years experience with Ford.
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    5493
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    1684
    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    1518
    12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2014-4-1_23659_avatar.64x64.jpg Mike V.'s Avatar

    Mike V.

    Auto Service Technician

    Satisfied Customers:

    789
    25 years experience on all makes and models, Licensed NYS Inspector.
  • http://ww2.justanswer.com/uploads/lostrider/2009-9-26_23144_php4VNWAA_c1PM1.jpg lostrider's Avatar

    lostrider

    Ford Technician

    Satisfied Customers:

    2940
    ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.
 
 
 

Related Ford Questions

Chat Now With A Ford Mechanic
Ron
Ron
Automotive Tech
21772 Satisfied Customers
23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs