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2003 Mitsubishi eclipse. Check engine soon light came on.
2003 Mitsubishi eclipse. Check engine soon light came on. The code I received from Advanced Auto is P0421 … read more
Ron
Ron
Automotive Tech
Vocational, Technical or Trade Scho
37,455 satisfied customers
I have a lancer 2003, i have a p0421 p0135 i change bank 1
i have a p0421 p0135 i change bank 1 sensor oxigen i yust ut a new 1 … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
1,393 satisfied customers
I have a 06 Mitsubishi Endeavor that has an error code
Customer: I have a 06 Mitsubishi Endeavor that has an error code P0421. The mechanic told me it is probably an O2 sensor failure. I want to find a compatible part for him to replace. It seems that the… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Dough, I have 2003 Mitsublishi Galant ES. I had code P0135
Hi Dough, I have 2003 Mitsublishi Galant ES . I had code P0135 which I replace a 02 sensor in bank 1 But now I getting a code P0421 and the code P0135 Clear up. What do I do now… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
I have 2 codes on my car on. P0300 and P0421.. 1999
Hi I have 2 codes on my car on. P0300 and P0421.. 1999 Mitsubishi Galant with a 2003 rebuilt motor. Car sometimes don't want to start not sure why or what I should fix first… read more
Roy
Roy
shop foreman
Associate Degree
4,481 satisfied customers
Mitsubishi Endeavor LS: Need new catalytic converter. Check
Need new catalytic converter. Check Engine Light on. Diagnostic shows Code P0421. Automotive Repair said that my vehicle has 3 converters. I need to know which one to replace and where can I buy?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
I have a 2006 mitsubishi galant 3.8 v6 with a service engine
I have a 2006 mitsubishi galant 3.8 v6 with a service engine soon light on.. Friend had a portable diagnostics mechanism, and showed the code p0421… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Eclipse GS: HI I recently purchased a used 02 Mitsubishi
HI I recently purchased a used 02 Mitsubishi Eclipse GS at 120,000 miles. A few days after I got my NYS inspection the check engine light came on. When I went to AutoZone to check the code it was p042… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Eclipse GT: I received a P0421 error. I have changed
I received a P0421 error. I have changed all 4 sensors and reset the code, however, the service engine light continues to burn bright and when I check the code, it is the same one for the sensors that… read more
Eric
Eric
Retired
N/A
33,589 satisfied customers
Mitsubishi Montero Sport: What is the problem when P0154 Bank
What is the problem when P0154 Bank 2 Sensor 1 (2003 Mitsubishi Montero Sport 3.0) comes up when testing Check Engine Light? The mechanic that I normally go to has spent months saying that he is askin… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
I recently received some excellent help regarding my 2001 Mitsubishi
I recently received some excellent help regarding my 2001 Mitsubishi Eclipse. I have a new problem now. The Service Engine Soon light came on, we read the code it was P0421....Catalyst system efficien… read more
Eric
Eric
Retired
N/A
33,589 satisfied customers
Mitsubishi Endeavor LS: Hey Doug - I have an 04 Mitsubishi
Hey Doug - I have an 04 Mitsubishi Endeavor and its giving me codes P0421 and P0431. I know that has to do with the cat, but what is the significance of simultaneous codes for bank 1 and bank 2. Any i… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Endeavor ls: My 2005 Mitsubishi Endeavor Ls check
My 2005 Mitsubishi Endeavor Ls check engine light came on recently and a friend checked it with a meter that showed p0421 warmup catalyst below threshold bank 1. When I called the dealer repair shop j… read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
11,778 satisfied customers
Mitsubishi Endeavor XLS: Hi Doug... I have a 2005 Endeavor
Hi Doug... I have a 2005 Endeavor which just the other day started putting out a P0431 code. I have read your response to this question and have a couple of follow-ups for you. Just for clarity's sake… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Mirage LS: Hi there, My 2001 Mitsubishi Mirage
Hi there, My 2001 Mitsubishi Mirage 1.8, 2 door Coupe, recently had a P0421 code and two weeks later, it now has a P0401 Code. Is the P0421 and P0401 code related in the sense that if the catalalytic … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Eclipse Spyder GT: 2007 Mitsubishi Eclipse spider
2007 Mitsubishi Eclipse spider GT 3.8 75K miles engine runs good but i keep getting a P0421 - warm up cat efficicienty bank 1 code and check engine light on after 5 drive cycles. I have snap on scan t… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Eclipse GT: My Nephew had a private mechanic diagnose
My Nephew had a private mechanic diagnose his "check engine light" and he found “check engine code P0421” which he took to the Dealer who ordered and installed a catalytic converter. After driving the… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
2007 Mitsubishi Endeavor: diagram of the catalytic converters
Can you provide me a diagram of the catalytic converters on a 2007 Mitsubishi Endeavor. How do you know which one is bad?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
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Meet the Experts:

Doug

Doug

ASE Certified Technician

8,659 satisfied customers

Mitsubishi employed and Factory trained ASE certified technician

George H.

George H.

ASE Certified Technician

317 satisfied customers

ASE Master tech 15+ years

Jake

Jake

Automotive Technician

213 satisfied customers

Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.

Tim Mohr

Tim Mohr

ase master

209 satisfied customers

30 yrs foriegn and domestic, gas and diesel

Chris (aka- Moose)

Chris (aka- Moose)

Technician

206 satisfied customers

16 years of experience

Mike Kelly

Mike Kelly

Mitsubishi Mechanic

104 satisfied customers

17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.

AMD

AMD

Master Technician

48 satisfied customers

L1 Advanced Level Diagnostics Specialist

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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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