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2003 Montero Pending Fault P0431 - Powertrain Warm up Cat
2003 Montero Pending Fault P0431 - Powertrain Warm up Cat Efficiency below Threshold (Bank 2) and P0660 Powertrain Intat Mainifold tunidng valvue controil circuit bank 1 … read more
Andrew
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P0421 reads: Warm up catalyst below threshold Bank 1. If
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My car failed emissions. My service engine light has been
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Doug
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Mitsubishi Montero: I have a 1997 Mitsubishi Montero (not Sport).
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My 2005 Mitsubishi Endeavor Ls check engine light came on recently and a friend checked it with a meter that showed p0421 warmup catalyst below threshold bank 1. When I called the dealer repair shop j… read more
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Mitsubishi Lancer GTS: I own a 2008 Lancer GTS (ja3au86u68u023089)
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Doug
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Mitsubishi Galant ES: Iam getting p0421 on my 1999 galant
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Mitsubishi Montero Sport LS 4x4: ive got a 1997 Montero sport
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Doug
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2003 Mits Lancer ES, code PO 0421 (warm up catalyst efficiency
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Mitsubishi Lancer ES: i believe i blew the fuse for the check
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Doug
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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
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Doug
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2003 Mitsubishi Lancer: trouble code..Warm..catalyst..below threshold
I have a 2003 Mitsubishi Lancer. It shows the following trouble code P0421 Warm up catalyst efficiency below threshold Bank 1. could someone explain what this means and a possible solution. Thanks for… read more
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
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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
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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

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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