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2003 galant se 2.4l aut. Has P0421 code but most importantly
2003 galant se 2.4l aut. Has P0421 code but most importantly seem to have a backpressure problems, coolant keep disappearing though the reserve is almost full, I will test for exhaust gases in coolant… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
373 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
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P0421 bank 1 is code on my mitsubishi. how to fix , car
Customer: P0421 bank 1 is code on my mitsubishi. how to fix … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 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
7,463 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
7,006 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
Automotive Repair Shop Manager
N/A
44,596 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
7,006 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
7,006 satisfied customers
Mitsubishi Montero: I have a 1997 Mitsubishi Montero (not Sport).
I have a 1997 Mitsubishi Montero (not Sport). It sat with a dead battery for a few months until I bought a new battery and had the alternator replaced, and now it runs well. However, my mechanic tells… 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 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
1997 Galant: catalytic converter replaced..vehicle inspection
I had the catalytic converter replaced on my 1997 Galant. I took the car to the vehicle inspection for my registration. It failed. The monitors status said not ready or not supported. It has been 6 mo… read more
Jake
Jake
5,826 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
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 Galant: catalyst below threshold bank 2..sensors
Mitsubishi Galant 2005...has codes of P0431 - warm up catalyst below threshold bank 2, and P0421 same but bank 1. I have very limited funds, and need to know what to have repaired first. I believe the… 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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