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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
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Vocational, Technical or Trade School
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I am getting a P0421 on my 2000 Mitsubishi Montego Sport. It
I am getting a P0421 on my 2000 Mitsubishi Montego Sport. It says it is warmup sensor for catalytic converter. What is the cheapest way for me to address this issue?… read more
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My name is ***** ***** and my car just failed an emissions
Customer: Hi, my name is ***** ***** and my car just failed an emissions test … read more
Doug
Doug
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I'm having a constant problem with code p0421 2003 montero
Hello, I'm having a constant problem with code p0421 2003 montero sport 3.0 v6. i have replaced the large cat in the back but the code is still there so i guess the small ones in the front are bad? Wh… read more
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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
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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
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Mitsubishi Galant ES: Hello, 2002 Mitsubishi Galant ES 2.4
Hello, 2002 Mitsubishi Galant ES 2.4 liter, 180000 miles. I got code P421. What are my options?… read more
Doug
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Mitsubishi Gal: I failed emission test and got P0421 code.
I failed emission test and got P0421 code. I have a 2003 Mitsubishi Galant 2.4L ES 114k miles (VIN# XXXXX). I took my car to a mechanic and paid for diagnosis. It says I need Front Cat Manifold + 2 Ga… read more
Doug
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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
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Mitsubishi Outlander: Stephen, I got the following error codes
Stephen, I got the following error codes for my vehicle when I was trying to get it inspected. p0138, p0171, p0441, p2595 I was informed that I needed to change my upstream and downstream sensors. I f… read more
Greg
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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
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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
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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
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eclipse gs: tuning..headers..without installing the factory manifold
i have a 03 eclipse gs 2.4 i eliminaed the pre cat to put a pair of cheap tuning pros headers on now i have the p0421 code what can i do to shut it off without installing the factory manifold… read more
Doug
Doug
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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
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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
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Vocational, Technical or Trade Scho
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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
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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
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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

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

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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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