A new question is answered every 9 seconds

1999 Ford Crown Victoria: Toruble Code P0430..Crown Vic

This answer was rated:

Toruble Code P0430 on 1999 Ford Crown Victoria P71.   

Hello... I read with interest about another person with a similar code on a 1997 model Crown Vic. In that reply, Chris (aka- Moose) indicated a TSB from Ford ( TSB 03-24-5) that would widen the parameters of the O2 sensors for bank 2.

Would this also apply to my 1999 Crown Victoria?

And, my last question is this: If I take my car to Ford and ask to have the PCM reprogramed per this TSB, how much will they charge to do this and reset the CEL?

I do realize that this may not solve my problem, however, if changing the parameters of the O2 sensors does help, then it would save me a lot of money.

Thanks in advance for your time and consideration.


Hello JON, I have attached a copy of that technical service bulletin, it is only applicable to the 1997 model year, the programming issue would have already been installed on later model year vehicles. If you do have any pcm updates available for programming on your vehicle, you can expect to pay approximately one hour lablor to install it at the dealer, however if you ask them to verify the catalyst efficiency and check and install any available updades at the same time, there shouldn't be any additional charge and it should still be at approximately 1 hour labor at your dealers labor rate probably between $75. and $95 per hour. I have also attached a technical service bulletin that covers service tips for diagnosing oxygen sensor and catalyst monitor trouble codes for your review.







Customer: replied 7 years ago.

THank you SuperBob for the info.... I am confused a little because I just had the codes pulled for a " Mega parts house" with their code scanner. They list a few possiblilties such as: engine mis-fire, large vacuum leak, of oil leak into exhaust valve guide due to worn rings or seal.



I have also heard that a bad or clogged EGR valve or faulty DPFE sensor can cause these codes. They are fairly inexpensive and I was considering just cleaning and then testing the EGR with a vacuum pump to see if it is still free. I do plan on checking the vacuum hoses to the DPFE sensor since it is tied to the EGR.




Rather than just throw parts at the problem, I am trying to narrow down possiblities. Believe me I realize that short of having the car and a bank of computers to start the diagonsis, you are kinda limited with choices. Laughing Replacing an O2 sensor is not too bad a job - and while it may be a tempory fix, I am afraid it may not solve the problem long term. The parts store suggested I start with them.. makes sense because they sell them!


I will do what I can here short of taking it to the dealer. IF it does need new cats - any idea how much a cat will cost? will they replace one or both cats bank 2? Will they want to replace the O2 sensors at the same time?


Sorry for the additional questions. I am reading the 2nd TSB you sent me now. It should give me a general direction to go in.

The catalyst monitor code that was set is comparing the oxygen sensor data on the outlet side of the cat versus the oxygen sensor data on the inlet to tell if the catalyst is working well enough to extact the polutants from the exhaust, usually a fautly sensor would not cause this code but a different code. Odds are you will require a new set of cats for this side of the engine, a scan tool monitor can look at the data stream and check the other side too, to see how close it is to failing. The catalysts can fail in this way for various different reasons, if the engine had a misfire early on in life the extra unburnt fuel could have overheated it 20 or 30,000 miles ago and shortened its life, it could have an active misfire or sticking fuel injector allowing too much unburnt fuel down there now, you could have hit a rock or curb on the cat and caused external damage to it causing the catalyst material inside to fracture. The scan tool diagnostics will also look at the fuel trim to see if your pcm is commanding a higher fuel trim due to a incorrect sensor reading, for example, if the mass airflow sensor is dirty and not reading all of the air that is entering the engine, it will not add any fuel for the air it cannot see, after combustion the 02 sensors pick up that extra air and determine the mix is lean, it then trys to compensate by changing the fuel trim and running richer. The mix is not accurate and may add too much fuel, the changes afffect overall performance. The dealer is not always the first choice but aftermarket shops to not have the knowledge or tools sometimes to correctly fix all concerns. If you replace the cats, without finding out what caused the failure, you may have your new cats fail before too long. The last set of cats I did on a 4.6 liter ran about $800 per side, this was a couple years ago. You may be able to locate a local exhaust shop that can cut your old one off and install a satisfactory aftermarket replacement for much less.

SuperBob, Ford Senior Master, Mazda Senior
Category: Ford
Satisfied Customers: 2609
Experience: 18 years Ford, Lincoln, Mercury, Mazda Dealer ASE master, diesel certified. Specialize electrical
SuperBob and other Ford Specialists are ready to help you
Customer: replied 7 years ago.

Thak you SuperBob for the excellent reply. I printed off the TSB and was reading it while I waited for the reply. It sounds like I should go ahead and take it to a repair shop or a dealer I can trust (if I can find one).


I will print off the answer as well and take it to the shop to discuss with them. At least they will know I am trying to help without wasting my money.


Thanks again,




Good luck and best wishes, it was a pleasure speaking with you
Ask SuperBob Your Own Question
SuperBob, Ford Senior Master, Mazda Senior
Category: Ford
Satisfied Customers: 2609
Experience:  18 years Ford, Lincoln, Mercury, Mazda Dealer ASE master, diesel certified. Specialize electrical
Type Your Ford Question Here...
SuperBob is online now
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.

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
< Previous | 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

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.

Meet The Experts:

  • Ron


    ASE Certified Technician

    Satisfied Customers:

    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguyu/2015-7-7_172556_onnieew.64x64.jpg Ron's Avatar


    ASE Certified Technician

    Satisfied Customers:

    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)


    Satisfied Customers:

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

    John Mc

    Ford Technician

    Satisfied Customers:

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


    ASE Certified Technician

    Satisfied Customers:

    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/BL/Bluegorilla/2012-6-21_16298_cam.64x64.JPG Cam's Avatar


    Journeyman Automotive Technician

    Satisfied Customers:

    GM Grand Master Technician 2007. 14 years Automotive experience.
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar


    ASE Certified Technician

    Satisfied Customers:

    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:

    25 years experience on all makes and models, Licensed NYS Inspector.