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Related Mitsubishi Questions
Check engine light. code p0420. Comes on and off. 2003
Check engine light. code p0420 JA: Does the light stay on, or does it blink? Customer: comes on and off JA: What is the model/year of your Mitsubishi? Customer: 2003 Lancer oz JA: Are you fixing your … read more
Greg
Greg
Shop owner, technician
Vocational, Technical or Trade Scho
6,971 satisfied customers
Thanks for coming on this time of the day. I own a 2002
Thanks for coming on this time of the day. I own a 2002 Mitsubishi Lancer ES 2.0L, auto trans, 181K miles. The CEL is on, Advance Auto Parts picked up the code P0401. Rainbow Muffler in St. Pete FL di… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
373 satisfied customers
P0421 reads: Warm up catalyst below threshold Bank 1. If
P0421 reads: Warm up catalyst below threshold Bank 1. If bank 1 O2 sensor is pre-cat, maybe that O2 sensor could be bad but not the catalyst. If it were Bank 2, the O2 sensor after the catalyst, there… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
21,651 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
1,987 satisfied customers
I have a 2006 Mitsubishi ES and I got a P0031 code (HO2S
I have a 2006 Mitsubishi ES and I got a P0031 code (HO2S Heater Control Circuit Low bank 1, sensor1 … read more
Gary
Gary
Gold Certified GM Technician
Vocational, Technical or Trade School
2,800 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
Expert
Expert
7,458 satisfied customers
Mitsubishi Lancer DE: hi, i have a mitsubishi Lancer DE 2009
hi, i have a mitsubishi Lancer DE 2009 2.0L automatique front real drive. im getting an error message p0137-p0037 which is the heated O2 sensor (bank 1 - sensor 2). i would like to know where is it lo… read more
Randall C
Randall C
Auto Technician / Consultant
Vocational, Technical or Trade Scho
13,799 satisfied customers
I have a 2006 Lancer and this code came up when trying to get
I have a 2006 Lancer and this code came up when trying to get my car inspected. (It was bought in Florida - no inspections there and now live in NY) The first repair shop I took it to told me I needed… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Mitsubishi Eclipse GS: Im getting a Knock Sensor trouble code
I'm getting a Knock Sensor trouble code and a Warmup Catalyst below threshold error. Is the catalytic converter going bad and causing the air fuel mixture to be to rich or too lean and causing an engi… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 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
42,028 satisfied customers
Mitsubishi Montero Sport: our 01 montero sport check engine
our 01 montero sport check engine light is on. had the codes read and came back as PO121, PO421,PO431. ok Bank 1 Bank 2 and throttle possition sensor. after reading a responce from Doug C (Expert) on … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 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
8,677 satisfied customers
Mitsubishi Lancer GTS: I own a 2008 Lancer GTS (ja3au86u68u023089)
I own a 2008 Lancer GTS (ja3au86u68u023089) and it has failed emissions. The trouble codes were p0421 & p0441. I took it to the dealer and they wanted approx. $1600 to replace the purge valve & cataly… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
2003 Mits Lancer ES, code PO 0421 (warm up catalyst efficiency
2003 Mits Lancer ES, code PO 0421 (warm up catalyst efficiency below threshold bank 1) Records show the cat (which one?) replaced at 78,000, currently 131,000. Fuel sensor (think #1) replaced two year… read more
Eric
Eric
Retired
N/A
42,028 satisfied customers
2003 Mitsubishi: Lancer..a trouble code P0421, What is the fix
2003 Mitsubishi (Lancer) has a trouble code P0421, What is the fix for this problem and how do you reset the engine light ? Thanks, Joe… read more
Tim Mohr
Tim Mohr
ase master
Master's Degree
230 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
8,677 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
8,677 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

8,677 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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