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Related Mitsubishi Questions
Code p0421 keeps showing up changed o2 sensors cleared code
Code p0421 keeps showing up changed o2 sensors cleared code but still shows up … read more
Kyle
Kyle
Under hood Technician
754 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
7,006 satisfied customers
I have a 2004 Mitsubishi galant that is throwing up codes p
Hi Doug I have a 2004 Mitsubishi galant that is throwing up codes p and p0421 car sputters at idle and take off do you have any possible idea what it could be… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Galant: 06 mitsubishi galant 2.4l obdii says all
06 mitsubishi galant 2.4l obdii says all four o2 sensors have failed. Is there a common connector or relay for the o2 sensors?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Answers from Two Experts requested: Mitsubishi Montero Sport XLS: I ha
I have a 2000 Montero Sport XLS, 3.0L, two wheel drive, automatic with 240K miles. I runs great. BUT It throws a code 421. I reset the code and it returns after 160 to 170 miles (mixed freeway and cit… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 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
Automotive Repair Shop Manager
N/A
44,596 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
7,006 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
7,006 satisfied customers
Mitsubishi Galant ES: My daughter has a 2003 Galant ES with
My daughter has a 2003 Galant ES with the 2.4 I4 engine with 190k. The fuel mileage has dropped to about 16 mpg, used to get 26. It has the 421 and 102 codes. I am fairly sure the 102 code is due the … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Galant: I have a 2004 Mitsubishi Galant 2.4L with
I have a 2004 Mitsubishi Galant 2.4L with 98,000 miles. My check engine light appeared for inspection and I was advised it was of code P0141. I took it to my mechanic and he replaced the O2 sensor in … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 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
7,006 satisfied customers
Mitsubishi Galant ES: I have a 2001 Mit Galant ES (4 cyl, 2.4L
I have a 2001 Mit Galant ES (4 cyl, 2.4L SOHC) with 194K miles. After several intermittent P0421 codes on cold mornings, it now stays on permanently. I've changed the downstream O2 sensor myself but t… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
2006 mitsubishi lancer es: my check engine light came on
OK I have a 2006 mitsubishi lancer es 2.0L. About 6 months ago my check engine light came on. I took it in and they said the Cat was bad. I had it replaced. Everything was fine until the other day the… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
2002 Mitsubishi Lancer ES: it failed emissions..trouble code..recall
I have a 2002 Mitsubishi Lancer ES and it failed emissions. They said the trouble code was P0421 and that there was a Mitsubishi recall on this. I got a recall notice in 2008 about a C0505JS problem. … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Check engine light came on when I was..Misfire..cylinder
Check engine light came on when I was out of town daughter continued to drive. Three codes came up Misfire in cylinder 3, P0421 and P0421PD. Changed the plugs erased the code and at 30 Miles took it b… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi eclipse gs: the converter..check engine light..autozone
I have an 01 mitsubishi eclipse gs and as you know the original headers are welded with the converter. Well i just bought a new header called spyder but they do not have the converter welded on. Well … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Lancer: I recently had my 2002 mits..inspected..p0135..o2 Sensor
I recently had my 2002 Mits Lancer inspected and failed due to codes P0135 and P0421. I brought the car to a Mits Dealer and was told those codes meant I needed $1399 in repairs: An O2 Sensor (B1 S1) … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
2005 Mitsubishi Galant: The Check Engine Light Keeps coming on, and we
We bought a 2005 Mitsubishi Galant for our daughter. The Check Engine Light Keeps coming on, and we have had it checked a couple of different times, and they tell me that the code is for the catalytic… read more
Gary
Gary
Vocational, Technical or Trade Scho
15,858 satisfied customers
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Meet the Experts:

Doug

Doug

ASE Certified Technician

7,006 satisfied customers

Mitsubishi employed and Factory trained ASE certified technician

Chris (aka- Moose)

Chris (aka- Moose)

Technician

373 satisfied customers

24 years of experience diagnosing & repairing

George H.

George H.

ASE Certified Technician

321 satisfied customers

ASE Master tech 15+ years

Tim Mohr

Tim Mohr

ase master

230 satisfied customers

30 yrs foriegn and domestic, gas and diesel

Don - Mo Lurch

Don - Mo Lurch

Mitsubishi Mechanic

60 satisfied customers

16 years, Line Mechanic, Electronics trouble shooting, etc

AMD

AMD

Master Technician

48 satisfied customers

L1 Advanced Level Diagnostics Specialist

BigBob

BigBob

Service manager/Technician

46 satisfied customers

25 years in the auto repair business

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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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