Question about 2004 Mitsubishi Endeavor

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Vehicle stumbles @ 30-40 mph

When i started the car stubled @ 30-40 MPH. Pulled the codes and found: P0431 Cat eff on bank 2 P0421 Cat eff on bank 1 P0302 Misfire on Cyl #2 Tracked the misfire down and replaced the Direct ignition Coil on 2 and. code no longer pops up. However There is still the stumble @ 30-40 MPH and now i have a pending P0300 Random misfire code.

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6ya6ya
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Posted on Jan 02, 2017

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  • 148 Answers

SOURCE: 2000 Galant trouble code P0300

The usual problems with the ISC motor are
a) one of the two coils goes open circuit ie it burns out.
b) the ISC internal gears chew themselves up, likely causing a).

The issue is therefore why the ISC chews up the internal gears. The usual
reason is that there's a build up of carbon and fuel gum in the throttle
body that stresses and jams the ISC gears. This gunk has to be cleaned out.
Further, most of the carbon comes from the PCV valve that vents hot oil
vapour into the intake from the rocker cover. This oil vapour can become
excessive when the valve stem seals are old and not doing their job
adequately any more. Since your car is a 2000, its not unlikely. Piston rIng
blowby is another source.

At a guess, the dealer tech has just replaced the ISC motor without doing an
adequate check (and clean) of the rest of the throttle body to ensure that
the ISC can adjust the speed freely. It may be that the new ISC is faulty,
but its unlikely. An unexpected failure (esspesially if the ISC gears are
again stripped) should result in a more detailed investigation.

Yes, its a warranty issue. Be polite to the dealer.

Posted on Jul 13, 2008

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redbeard00
  • 957 Answers

SOURCE: Engine Random Misfire code PO-300

P0300 is for random miss-fire, loose or defective gas-cap, water in the fuel, damaged vacuum line, clogged fuel and/or air filter, faulty plugs and/or wires, fuel injectors. These are more common reasons, there are others but this a good start.

Posted on May 15, 2009

  • 74 Answers

SOURCE: 0304 code -Keep getting Cylinder 2 misfire code Mitsubishi galant

code 304 is number 4 cyl,check the plug insulator for white(arch) markings-if you see any markings replace the insulator

Posted on Aug 31, 2009

  • 194 Answers

SOURCE: used seafoam in oil engine misfiring

determine when it misfires, and isolate cylinders. a poormans method is use an infrared temperature gun (one with high range, 700 degrees or more is preferable) and with engine held at rev(say 2500) point at each exhaust port 1 by 1, misfiring holes have colder exhaust than firing holes.
If the misfire is momentary or intermittant, or caused by defective cam or crank sensors, you should see professional help...those problems require more advanced equipment to get the 1st time, unless you dont mind lobbing expensive parts randomly till you get lucky

Posted on Sep 12, 2009

  • 327 Answers

SOURCE: Service Engine Soon

you need to change all the o2 sensors reset the computer it might come back on a couple of times just keep resetting it you could buy one of the cheap code scanners for 49 or 59 dollars and reset yourself if you go to a shop they are going to sell you a catalytic converter for a few hundred bucks and the code will come back. let me guess you got about 100,000 miles on it what it really means is a shop or dealer will get paid for a cat job when you dont need one

Posted on Aug 03, 2010

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1 Answer

2003 ES. What are the probable causes of DTCs P0421 and P0431?


code p 0421 refers to warm up cat converter bank 1--efficiency below threshold ===causes ---cat converter---wiring---HO2S 2
( heated oxygen sensor)
code p 0431 refers to warm up cat conveter bank 2--efficiency below threshold === causes cat converter --- wiring---HO2S 2
as the same HO2S appears in the cause of the fault I would be inclined to change it first
the HO2sS sensor is the one in the exhaust manifold or before the cat converter
and 2 is in the front bank of a V engine
use the special socket when removing/ replacing these sensors as an incorrect tool is the main reason for wire failures on the sensors

Dec 17, 2015 | 2003 Mazda MPV

1 Answer

P0421 code bank 1 warm-up efficiency below limit


P0421 code is that the cat. converter is below efficiency. 99 per cent o the time the cat. needs to be changed. but if you have a scan tool watch both bank 1 O2 sensor 1 and bank 1 sensor 2.
cold they should be almost the smae but when its at operating temp, and running down the road at crusie speed the frt o2 should switch rapidly between .150 mv. and .850 mv. and the rear o2 should read about .600 mv. if they read the same the cat is ng and will have to be replaced.

Oct 28, 2013 | 2001 Mazda Millenia

1 Answer

Stumble @ 30-40 MPH under ligh acceleration


Problem sometimes is with cheap parts they are bad.Good wires,good plugs,good coils.

May 05, 2013 | 2004 Mitsubishi Endeavor

1 Answer

I have a 2002 Kia Sedona that is gettting codes P0421, P0431 consistently and P0456 rarely. Can one determine if the cc's are working by the exhaust smell? I have had the threshold codes since I b


Trouble Code: P0421
Main Catalyst Efficiency Deterioration (Bank 1)
Trouble Code Conditions: DTC P0136, P0139 and P0140 not set, engine running at 3000 rpm or high in closed loop at 45-60 mph for 140 seconds, and the PCM detected the rear HO2S and front HO2S signals were too similar.
Possible Causes:


Air leaks at the exhaust manifold or in the exhaust pipes. Catalytic converter is damaged or has failed . Front HO2S or rear HO2S is contaminated with fuel or moisture. Front HO2S or rear HO2S heater is damaged or has failed. Front HO2S or rear HO2S is contaminated with fuel or moisture. Trouble Code: P0431
Main Catalyst Efficiency Deterioration (Bank 2)
Trouble Code Conditions: DTC P0150, P0154, P0159, P0158, P0160 and P0161 not set, engine started, engine running at 3000 rpm or high in closed loop at 45-60 mph for 140 seconds, and the PCM detected the rear HO2S and front HO2S signals were too similar in the Catalyst Monitor test.
Possible Causes:


Air leaks at the exhaust manifold or in the exhaust pipes. Catalytic converter is damaged or has failed. Front HO2S or rear HO2S is contaminated with fuel or moisture. Front HO2S or rear HO2S heater is damaged or has failed. Front HO2S or rear HO2S is contaminated with fuel or moisture .

Jul 24, 2012 | Cars & Trucks

1 Answer

Check Engine light problem. P0431 code problem. It's already being determined it's the oxygen sensor. But which one? Is it Bank 2 or Bank 1. If it's one of the Banks is it before or after the...


O2 Sensor codes are usually in the P0130- P016x range.
P0431 is Warm up catalyst efficiency bellow threshold Bank 2
Don't know what you're working with so just figure bank 1 comes off the bank with the number 1 cylinder.

Aug 30, 2011 | Mitsubishi Montero Cars & Trucks

2 Answers

SERVICE ENGINE SOON LIGHT CAME ON READS CODE P0431 AND P0421


Converter is not working as efficiently in Bank 1 and Bank 2 (two codes)...

P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.

Causes: A code P0421 may mean that one or more of the following has happened:
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
A sparkplug is fouled up

Possible Solutions:
Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

P0431 - Warm Up Catalyst Efficiency Below Threshold (Bank 2)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes: A code P0431 may mean that one or more of the following has happened:
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak

Possible Solutions:
Inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


Hope this helps.

May 05, 2011 | 2004 Mitsubishi Endeavor

1 Answer

03 santa fe code p0421 for warm up catalyst below bank 1is it converter sensors whats bank 1 converter location compared to bank 2 is there 2 banks or converters would it be upstream or downstream if it...


If the engine is a V6 (2.7 or 3.5 lit), bank 1 is next to the firewall (right hand) when facing the back of the engine.
If the engine is a 4 cly (I4), there is only one bank and is designated Bank 1 (exhaust manifold).

The catalyst to which the code refers is the UPSTREAM, and there is only ONE upstream cat for any bank.

Clue: Two upstream O2 sensor and two downstream O2 sensors - one before the CAT and one after the CAT. the downstream O2 sensors are identical to their upstream sisters. The only reason for the DOWNstream sensor is to monitor the CAT efficiency (threshold).

The catalyst on either bank is essentially the exhaust manifold which houses the CAT... it is the only CAT to which the code P0421 applies.

Hope that helped

Feb 06, 2011 | Hyundai Santa Fe Cars & Trucks

1 Answer

My blazer is having trouble accelrating past 40 mph, the vehicle is running rough and slugish once it gets up to 55 the service engine light blinks i hav e changed out the mass air flow and did a fuel...


check the #3 O2 senser that is located just in front of the cat. really check the wiring that it connects to in that area, as mine had a wire pinched between the frame and the body ( from the factory) that eventaulaly wore through and casued the sensor to fail. usually no error code was set and the engine would stumble terrible from 40 to 60 mph. Had to replace the sensor with new, and clean out corrosion IN THE CONNECTER before everything was resolved.
there are 4 O2 sensors in the 97, 1 on each bank, 1 just before the cat and 1 after the cat. the one before the cat appears to be critical to set mixture, so check or replace that one first

Dec 09, 2010 | 1997 Chevrolet Blazer

2 Answers

What are codes P1492, P0421 & P0431 on the 2002 Mazda Millenia?


po421 warm up catalyst efficiency below threshhold bank 1, 431 same on bank 2..

Feb 08, 2010 | 2002 Mazda Millenia

1 Answer

P0421, P0431


Technically, you can put the car in neutral and press the gas while the car is running, til it reaches 3500 rpm. You don't have to actually have the car on the road while you do this.

Apr 06, 2009 | 1999 Mazda Millenia

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