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p0420 code 2003 ford taurus 3.0 110000miles


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ghenry1
Novice

Jul 28, 2013, 7:41 AM

Post #1 of 10 (2959 views)
p0420 code 2003 ford taurus 3.0 110000miles Sign In

car JUST came back from dealer.car is a 2003 ford Taurus has a 3.0 motor and about 110000 miles.was misfireing on 1,3,5,cyls...did this for several weeks.I took it to my dealer and they installed a coil pack.I have put in plugs,wires,2 o/2 sensors,and dealer installed a coilpack.....coil fixed the mis-fire and now I get this p0420 code.All work,less the coil pack was done over a yr or so ago,car is due for inspection.....gas milage is about 20 per gal and is mostly driven just on the streets...also have just put in lucas it clean any deposits..car runs like it should....no noises or misfires..help....thanksUnsure


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 28, 2013, 8:05 AM

Post #2 of 10 (2943 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

Driving it around with that severe misfire has ruined your Catalytic Converter and you're going to have to replace it.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ghenry1
Novice

Jul 28, 2013, 8:09 AM

Post #3 of 10 (2941 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

any chance that to o2 sensor is bad?I have replaced it before....thanks


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 28, 2013, 8:12 AM

Post #4 of 10 (2937 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

Nope, it takes a very specific set of circumstances to set that code and given the history, it is no surprise at all and actually expected.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ghenry1
Novice

Jul 28, 2013, 8:18 AM

Post #5 of 10 (2935 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

like most fords I guess...it has more than 1....which 1 would I need to replace,or how could I tell which 1 needs to be replaced.......thank you...was hoping for better news...lol


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 28, 2013, 8:29 AM

Post #6 of 10 (2930 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

I don't believe you are going to have that option. I believe they are all built into a single "Y" pipe that has to be replaced. It should come with all of them.

Either way, you need the one for the rear bank.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ghenry1
Novice

Jul 28, 2013, 8:41 AM

Post #7 of 10 (2926 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

thanks....it has 1 in the front by the motor,and then 1 on down in the middle of the system....so...its the rear 1 that needs to be replaced....right? thank you for your time


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 28, 2013, 8:58 AM

Post #8 of 10 (2919 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

I believe it may actually have 3. I can't give you specifics because I don't know what engine you have. All 3 available engines are 3.0. I need the 8th digit of te VIN#.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ghenry1
Novice

Jul 28, 2013, 9:04 AM

Post #9 of 10 (2916 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

the 8th digit is a u


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 28, 2013, 9:43 AM

Post #10 of 10 (2908 views)
Re: p0420 code 2003 ford taurus 3.0 110000miles Sign In

OK, it actually has 3. The 3rd one is not monitored so you are looking at changing the "Y" pipe.











~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jul 28, 2013, 9:45 AM)






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