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Related Mitsubishi Questions
I am trying to diagnose whether my O2 Sensors or Catalytic
I am trying to diagnose whether my O2 Sensors or Catalytic converter is going out. I have some OBD2 data in an excel file tracking the O2 voltages and short term fuel trim if that helps. … read more
HDGENE
HDGENE
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Have a Mits Galant ES 2.4L (2003) throwing codes P0304 and
Have a Mits Galant ES 2.4L (2003) throwing codes P0304 and P0421. Has 185K. Idles a little rough cold (occasionally) but otherwise is smooth.… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
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My 2007 Mitsubishi Outlander is giving codes P0421 and
My 2007 Mitsubishi Outlander is giving codes P0421 and P0431. The shop I was at said i need a new catalytic converter. Is that the best course of action to take?… read more
Eric
Eric
Retired
N/A
41,992 satisfied customers
Engine codes. I've reset it. It came back up and I have
Yes, I've reset it. It came back up and I have P0421 & P0431 … read more
sprinkles08
sprinkles08
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High School or GED
19,828 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
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Vocational, Technical or Trade Scho
8,677 satisfied customers
Answers from Two Experts requested: Mitsubishi Galant ES: I have a 2003 Mitsubishi Galant
I have a 2003 Mitsubishi Galant and it has a recurring code of 421 and 507 I just replaced the Intake which had cracked (2.4L)… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
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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 Galant ES: Iam getting p0421 on my 1999 galant
I'am getting p0421 on my 1999 galant which have 108000 miles. Check status of monitors and all say ready. The o2 sensors have never been changed as far I know. The car is running fine and there are no… read more
Eric
Eric
Retired
N/A
41,992 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
8,677 satisfied customers
Mitsubishi Galant ES: i am trying to order an o2 sensor for
i am trying to order an o2 sensor for my 2005 mitsubishi galant 4cyl. I am getting a code p0155 which is bank 2, sensor 1 O2 sensor upstream. however in my manual i see the O2 sensor listed as cylinde… read more
Mike Kelly
Mike Kelly
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Vocational, Technical or Trade Scho
2,509 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 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
8,677 satisfied customers
2003 mitsubishi lancer: 2 o2 sensor..catalytic converter..pcm..column
my 2003 mitsubishi lancer has a engine service light, p0421, on. I replaced 2 o2 sensor, a down stream Bosal OE catalytic converter, then reprogrammed the pcm as advised by this column, all replaced w… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
2004 mitsubishi galant: AFTER THE CHECK ENGINE LIGHT IS ON I..CYLINDER
HI, I'VE GOT A 2004 MITSUBISH GALANT 4A3AB36F54E127652. AFTER THE CHECK ENGINE LIGHT IS ON I READ A CODE P0421 AND PROCEED SOME TESTS, BUT I'M HAVING SOME TROUBLE TO IDENTIFY THE OXIGEN SENSOR ON CYLI… read more
HondaPlatinum
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Mitsubishi Galant I Have 02 Mitsubishi Galant 3.0 V6 with
I Have 02 Mitsubishi Galant 3.0 V6 with the check engine light on, It Has Codes P0431 and P0432. Can someone please help figure out what's the problem?… read more
Amedee
Amedee
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Vocational, Technical or Trade Scho
22,400 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
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
2001 Mitsubishi eclipse: o2 sensors..Upstream..exhaust manifold
2001 Mitsubishi Eclips GS. Computer code indicates trouble between o2 sensors. Upstream is in exhaust manifold. Downstream is before cat converter. Is this correct for a two sensor application. It loo… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 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)

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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

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30 yrs foriegn and domestic, gas and diesel

Don - Mo Lurch

Don - Mo Lurch

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60 satisfied customers

16 years, Line Mechanic, Electronics trouble shooting, etc

AMD

AMD

Master Technician

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BigBob

BigBob

Service manager/Technician

46 satisfied customers

25 years in the auto repair business

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