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I have a code p0420 on my Ford Edge 2013. P0420 catalyst sys
P0420 catalyst sys efficiency below threshold (Bank 1) … read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
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Ford Ranger: I have a 1996 Ford Ranger, 2.3 L engine. My engine
I have a 1996 Ford Ranger, 2.3 L engine. My engine light came on and I read the code and received the following: P040 Catalyst System Efficiency below threshold Bank 1 and P1131 NO DTC definition foun… read more
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ford escape: i have a 2005 ford escape with check engine light
i have a 2005 ford escape with check engine light on my code reader indicates its code p0420 catalyst efficiency below threshold i am looking for the cause of that so i can make repairs… read more
Ron
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Ford Focus ZTW: Hi I have a 2003 ford focus M/T, it doesnt
Hi I have a 2003 ford focus M/T, it doesn't start but turns over, getting fuel to the rail but when you pull the plugs there bone dry. Found code P0193 fuel rail pressure sensor high input. I'm also g… read more
Steve
Steve
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1999 Mustang 3.6 L V6. Got codes P0411 (Secondary Air Injector
1999 Mustang 3.6 L V6. Got codes P0411 (Secondary Air Injector Incorrect Flow), P0420 (cat system efficiency below threshold bank 1) and P0426 (cat efficiency/temp. bank 1). I've had a problem with th… read more
6Bucs
6Bucs
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96 Ford Contour: DTC..P0420..cyl..the converter requires replacement
Encountering a DTC P0420 "Catalyst System Efficiency Below Threshold (Bank #1)" on a 96 Ford Contour 4 cyl with 160k miles, purchased with 155k. Does this indicate the converter requires replacement o… read more
CTFordTech
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2004 ford f150 fx4: idleing..error code p0430..cam shaft..sensors
I have a 2004 ford f150 fx4. Overnight it started having trouble idleing. I received the error code P0430 and have replaced both cam shaft postioner sensors. I have checked all the wiring and also hav… read more
Marty
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2004 Taurus: I have a po430 bank 2 cat efficiency code;below threshold
I have a po430 bank 2 cat efficiency code;below threshold on my 2004 Taurus.What would be wrong with it?… read more
Shawn
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99 contour: had code p0420 replaced bank 1 o2 sensors test drove
99 contour had code p0420 replaced bank 1 o2 sensors test drove and returned with pending code p1151 what do you think… read more
Ron
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Vocational, Technical or Trade Scho
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1998 ford explorer: ck engine light..po 430 catalyst efficiency
i have a 1998 ford explorer and had the ck engine light tested and it said po 430 catalyst efficiency below threshold bank 2,so what does this mean in repairs,thanks kim… read more
Dennis
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1997 Aspire: runs fine..cool..check engine light comes on... any ideas
I have a 1997 Aspire, it runs fine at cool temps but once it heats up it begins to miss. These are the codes I get when the check engine light comes on... any ideas? Thanks! p0300 - random misfire p03… read more
Anthony
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2004 Ford Ranger: code reader..Code p0420..Catalyst..Service Manual
We have a 2004 Ford Ranger. Our OBD II code reader is coming up with Code P0420, Generic description - Catalyst System Efficiency Below Threshold (Bank 1). The book then says to refer to the Vehicle''… read more
Ron
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96 ford taurus: put an obd II code reader..po420..egr valve and i
I have a 96 ford taurus that does not start it will start some times. I have put an obd II code reader to it and have recieved the codes po401, po420, po430 i was told with these codes to replace the … read more
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98 Ford Explorer: 12/97..Check Eng Light..analyzer..slow..converters
98 Ford Explorer 5.0 purchased 12/97, 71K has Check Eng Light on. Ford advises error code PO430 in memory twice, analyzer reports #11 & #21 HEGOS slow, both left and right converters failed. Warrenty … read more
Chris (aka- Moose)
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P0430 code keeps reoccuring . . . Bank 2 [is that the right ...
P0430 code keeps reoccuring . . . Bank 2 [is that the right passenger side] . . . "cat efficiency below limit" . . . is this an o2 on the passenger side problem [have already replaced the sensor 'behi… read more
Chris (aka- Moose)
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LX..4.6 engine repeatedly shows check engine light..P0420..O2 sensors
My recently aquired 1994 TBird LX with 4.6 engine repeatedly shows check engine light. Code shown is P0420, but O2 sensors appear to be working normally. Clear code and about 500 miles later it reappe… read more
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Obd..it reads catalyst system efficiency below threshold ,left bank &
obd code P420&P430 it reads catalyst system efficiency below threshold ,left bank & right bank how do I correct this problem?… read more
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Fordanswerman
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Associate Degree
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1996 Ford WIndstar: the possible problems are..P0420..Catalyst System
I need to know what the possible problems are with my 1996 Ford WIndstar GL. I brought it in and had the system read. It came up with this: P0420 Catalyst System Efficiency Below Threshold (Bank 1).… read more
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Meet the Experts:

Ron

Ron

ASE Certified Technician

25,182 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

29,223 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Mike V.

Mike V.

Auto Service Technician

1,591 satisfied customers

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

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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