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I can't get the check engine light to go away. Stays on,
Yea I've replaced the o2 sensor but still reads that I haven't and says lambda whats that mean … read more
Bradley Jordan
Bradley Jordan
Retired
diploma
622 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
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I have a 2001 Mitsubishi Eclipse GT 3.0L error codes P0431
I have a 2001 Mitsubishi Eclipse GT 3.0L error codes P0431 P0421 … read more
camerontech
camerontech
20 year experience diagnostic technician
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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
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P0421 came on after changing all 4 o2 sensors, Yes and have
Prior ro changing all the o2 sensors i had codes for bank 2 cat. Eff. Now its moved to bank one… read more
sprinkles08
sprinkles08
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My smog test failed. P0421- catalyst 1 efficiency below
my smog test failed. P0421- catalyst 1 efficiency below threshold bank 1. … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
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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
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Mitsubishi Eclipse GTS: I have a 2002 Mitsubishi Eclipse Spyder
I have a 2002 Mitsubishi Eclipse Spyder GTS that was in a front end collision two years ago and has been in storage until the last few months where I have been repairing it. Yesterday I took it on a l… read more
Doug
Doug
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Mitsubishi Endeavor: George, I have an Endeavor 04, when
George, I have an Endeavor 04, when I did the check engine the following codes were listed: P0455: Evaporative Emission system leak detected (large leak) P0153: O2 sensor circuit slow response bank 2 … read more
Pete
Pete
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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
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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
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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
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N/A
42,073 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
42,073 satisfied customers
Mitsubishi Eclipse GT: I have recently purchased a 2007 eclipse
I have recently purchased a 2007 eclipse GT v6 3.8 liter automatic and the check engine soon light came on!! I took it to my mechanic to see what was up and he hooked the diagnostic computer up and it… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Eclipse: I have a 2001 Eclipse Spyder Gt. I replaced
I have a 2001 Eclipse Spyder Gt. I replaced the O2 sensor on bank 1 because of a P0135 code. That code has cleared and I now have a P0431 code. I notice that I have a loose wire coming from the wire b… read more
Tim Mohr
Tim Mohr
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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
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
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mitsubishi endeavor: LS...check engine light..oxygen sensors
I have a mitsubishi endeavor (2007) LS. The check engine light will not go off. Code showed oxygen sensors so I replaced all 4 sensors. Will still not go off. I don't have the codes with me but if I r… read more
HondaPlatinum
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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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