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Related Mitsubishi Questions
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
21,660 satisfied customers
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 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
We are considering buying a 2004 Endeavor son but we
Hello, we are considering buying a 2004 Endeavor for my son but we encountered a couple of issues. So I wanted some information to see if it was worth fixing. First off the truck starts to shake as yo… read more
Tim Mohr
Tim Mohr
ase master
Master's Degree
230 satisfied customers
Mitsubishi Endeavor LS: Need new catalytic converter. Check
Need new catalytic converter. Check Engine Light on. Diagnostic shows Code P0421. Automotive Repair said that my vehicle has 3 converters. I need to know which one to replace and where can I buy?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Endeavor: My 04 mitsubishi endeavor has codes p0421
My 04 mitsubishi endeavor has codes p0421 and p0431. I need to pass emissions. Do I need to replace bank 1&2 cats?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Endeavor LS: Hey Doug, got an 04 endeavor which
Hey Doug, got an 04 endeavor which I replaced the front side o2 sensor last year. I pressure washed the engine comp a couple months back and unfortunately a misfire was then present. I figured I had s… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
At 138000 miles transmission is slipping at 30 to 40 miles per hour. Do I need a new trans
At 138000 miles transmission is slipping at 30 to 40 miles per hour. Do I need a new transmission or fluid and screen changed. Below 30 and above 45 miles per hour drives fine. 2004 Mitsubishi endeavo… read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
11,778 satisfied customers
Hi Doug Thank you for your advice last time. Well I have a
Hi Doug Thank you for your advice last time. Well I have a bunch this time, not sure if they are related: 1. The check engine light went off on my 2003 Mitsubishi Montero Limited. So I went ahead and … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 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 Endeavor LS: I own a 2004 Mitsubishi Endeavor LS
I own a 2004 Mitsubishi Endeavor LS AWD. A few months ago, the check engine light went on and it gave me a P0431 code. After checking with my mechanic he told me the catalytic converter was bad. I did… 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
ase master
Master's Degree
230 satisfied customers
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
7,006 satisfied customers
2007 Mitsubishi Endeavor: diagram of the catalytic converters
Can you provide me a diagram of the catalytic converters on a 2007 Mitsubishi Endeavor. How do you know which one is bad?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Galant GS The code PO421 Warm Up Catalyst Efficiency
The code PO421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)(5). What kind of repairs am I looking at?… 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
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
7,006 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

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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

Mitsubishi Mechanic

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16 years, Line Mechanic, Electronics trouble shooting, etc

AMD

AMD

Master Technician

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L1 Advanced Level Diagnostics Specialist

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BigBob

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25 years in the auto repair business

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