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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
21,511 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
8,677 satisfied customers
04 Galant 2.4 Getting p0421 and p0431 Debating on whether
04 Galant 2.4 Getting p0421 and p0431 Debating on whether it is to downstream o2 sensors or catalytic converter.… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Mitsubishi Montero Sport LS 4x4: ,I just found this threat.
Hi, I just found this threat. I had the catalytic converters replaced, and still am getting the same code p0431. What's the next step you think? Engine light came on within 80 miles of driving.… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 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
8,677 satisfied customers
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
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
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 Montero Sport: Diagnostic code P0431, P0421 on a
Diagnostic code P0431, P0421 on a 1999 Montero Sport 3.5 V6. Catalytic Converters or 02 sensors? If Cat is it a DIY job with direct fits or better off taking it to a shop.… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
service engine light on, codes- po154, po421 & po174 is a pending code, I pulled the c
service engine light on, codes- po154, po421 & po174 is a pending code, I pulled the code info but what exactly do these codes mean, (PO154) O2 sensor CKT no activity bank 2 sensor (PO421) warm up cat… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 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
8,677 satisfied customers
lancer: my 2003 es..engine light came..was my o2 sensor...oem
I put a magnaflow high flow cat on my 2003 es lancer an ever since then my engine light came on.. I got it checked an they said it was my O2 sensor.. I got it changed but the light is still on.. Any s… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 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
8,677 satisfied customers
Mitsubishi Galant ES: I have a 2001 Mit Galant ES (4 cyl, 2.4L
I have a 2001 Mit Galant ES (4 cyl, 2.4L SOHC) with 194K miles. After several intermittent P0421 codes on cold mornings, it now stays on permanently. I've changed the downstream O2 sensor myself but t… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 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
8,677 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 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
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)

Technician

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24 years of experience diagnosing & repairing

George H.

George H.

ASE Certified Technician

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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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