Question about 2002 Mitsubishi Galant

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Why would the OBD computer give a code P0421 but there are no check engine lights on, is this possible?

Went to get car inspected in Mass, failed emmissions cause obd code P041 but there are now check engine lights on in the car. 2002 galant 4 cyl AT

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: MITSUBISHI GALANT 2002 CHECK ENGINE LIGHTS ON

dd u cjeck the ECM?

Posted on Jun 24, 2008

chiquititas
  • 1010 Answers

SOURCE: OBD 2 code showing 301

P0300, P0301, and P0302 are all misfire codes (cylinders #1 and #2, and a multiple/random misfire). The only time I've heard of this being related to a crank sensor is if the sensor were loose. Furthermore, a crank sensor issue should affect all cylinders equally. So I'd expect you'd have the P0300 only, or all the codes you have plus P0303 and P0304 (and P0305 and P0306 if a V6).

You should continue checking your secondary ignition system. Presuming the wires and plugs made no difference in the codes or condition, check the coil. You'll want to do your checking when the problem is occurring. Perhaps even mist the wires and coil with water to see if you can see a spark jumping. If you do indeed see a spark jumping, that is the location of your problem.

Another strategy you can use is to take the #1 and #2 plug wires (if accessible) off the plugs and just set them back in place without clipping back onto the plugs. Then, start the car, and gradually pull the wire(s) off the plug(s). The spark should come out of the end of the wire onto the plug. If it comes out of the coil or the side of the wire, then the problem is in the location of the spark.

If you're unable to find a secondary ignition problem, then you should begin investigating whether you have a fuel delivery or internal engine problem causing the misfire. Most engine issues will show up with a compression test. If you indeed are only misfiring on cylinders 1 and 2, you can swap those injectors with the others to see if the misfire follows the injectors.


Posted on Jun 25, 2008

toddg
  • 171 Answers

SOURCE: 2002 Galant, Stalling at lights

Check the Crankshaft Position Sensor. This causes this exact effect.

Posted on Sep 29, 2008

  • 14 Answers

SOURCE: P0421 code on recently purchased(from dealer) 2002 RS

Hi,

So you have a P0421.

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

As far as running conditions if it performs normally, you most likely need a catalytic converter. The good part of this is there shouldn't be any abnormal running conditions, so it should be fine unless the engine is running very rich for some reason. (it will usually smell badly when this happens) However, on rare occasions the cat can get hot and melt down causing an exhaust restriction..bad gas mileage, low power, and possible fire potential, but most likely this is not the case. (this is generally speaking here and covering all the bases... )

The most common thing with P0421 that the fuel injection computer detects that the cat is not performing to federal specs an need to be replaced. You will need to have it fixed before your vehicle inspection.
Good luck and I hoped this helped you.

Posted on Dec 27, 2008

dsacco86
  • 1077 Answers

SOURCE: Mitsubishi Galant 2002 will not start

Glad I can help. :)

Posted on Apr 19, 2009

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Code p0171on my 2000 monte Carlo with 3.8 engine. Tapped on maf sensor no response. What next?


the following information courtesy of obd .com A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor Possible Solutions A lot of times, cleaning the MAF sensor and finding/fixing vacuum leaks fix the problem. If you're on a tight budget, start there, but that may not be the fix for certain. So, possible solutions include: Clean the MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect all vacuum and PCV hoses, replace/repair as required Inspect all hoses and connections in the air intake system Inspect and/or test the intake manifold gaskets for leakage Check for a dirty fuel filter and proper fuel pressure Ideally you'll want to monitor short and long term fuel trims using an advanced scan tool If you have access, you may want to run a smoke test

Read more at: http://www.obd-codes.com/p0171
Copyright © OBD-Codes.com

Jul 21, 2015 | Cars & Trucks

1 Answer

Is it possible to get a P0421 code from the OBD computer when the engine light is not on?


Yes it is and it would mean that the problem that caused the P0421 has either been corrected or is intermittent and is no longer in the state causing the failure. P0421 is a code for Warmup Catalyst Efficiency so there. Like be an intermittent problem with an O2 sensor or the catalytic converter may be starting to clog.

May 06, 2014 | Mitsubishi Galant Cars & Trucks

1 Answer

Repalce egr and engine light still on


OBD II needed to reset and erase the codes. they will go out after a large number of uses. but for about $50 you can buy an OBD 2 for you car and plug it in under your dash usually and reads the code and tells you whats wrong and what sensors are showing up. also can erase the codes and turns out the engine light . PS if your going to inspect your car. Once you erase the codes you`ll need to drive your car for 80 to100 miles for the computer to reconfigure itselt for the engine performance. otherwise the inspection will read computer not ready na dyou`ll fail inspection.

Apr 04, 2014 | 2006 Buick Rendezvous

1 Answer

My 1995 toyota tercel failed its smog check due to the OBD system check-fail


Have the fault codes read and that will point to the faults that caused the problem

Apr 07, 2013 | 1995 Toyota Tercel

1 Answer

I tried to take my car through inspection this morning. It failed because there was a problem with my OBD. I want to know what is that and how can I fix it.


OBD is on board diagnostics. If you have a check engine light on in NY(does not include upstate) your car cannot be inspected until either the codes are cleared and a drive cycle is completed or the fault is repaired. A drive cycle will allow the computer to do self tests on the various systems...ex: catalytic converter, O2 sensors, EVAP systems, engine misfire. Depending on the fault code, it may be a simple or expensive repair. Is or was your check engine light on and what are the codes stored? Find out at a local shop or some auto parts stores can access your computer and tell you

Nov 13, 2012 | 1997 Ford Contour

3 Answers

Hi i have got a p103 code on my obd meter with check engine light on . vw 1998 golf 2.0 litre manual no turbo failed emmissions test.


P0103 Mass or volume airflow circuit high input, for this code the fix is either your MAF is disconnected or look at the duct tube for any tears that will give false air.

Jun 13, 2011 | Volkswagen Golf Cars & Trucks

4 Answers

I have a 2001 Santa Fe and the Engine light is lit and has been for many years. When I took the vehicle for the State Inspection I was told that the Co2 needed to be changed so the light would come off and...


The best thing to do is go to Auto Zone and get your Hyundai scanned for a DTC code. That would tell us which O2 sensor has gone bad. You have three O2 sensors and one of them has gone bad, the O2 sensor sends signals to the ecm to control the air fuel mixture so it will not run to rich or to lean which is causing you to fail the state inspection. Good luck and keep me posted on what the DTC codes are, be glad to help.

Jun 25, 2009 | 2001 Hyundai Santa Fe

1 Answer

P0421 code on recently purchased(from dealer) 2002 RS


Hi,

So you have a P0421.

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

As far as running conditions if it performs normally, you most likely need a catalytic converter. The good part of this is there shouldn't be any abnormal running conditions, so it should be fine unless the engine is running very rich for some reason. (it will usually smell badly when this happens) However, on rare occasions the cat can get hot and melt down causing an exhaust restriction..bad gas mileage, low power, and possible fire potential, but most likely this is not the case. (this is generally speaking here and covering all the bases... )

The most common thing with P0421 that the fuel injection computer detects that the cat is not performing to federal specs an need to be replaced. You will need to have it fixed before your vehicle inspection.
Good luck and I hoped this helped you.

Dec 27, 2008 | Mitsubishi Eclipse Cars & Trucks

1 Answer

OBD works with dealer computer, fails with Registry computer


in mass if the tps light is on it will not pass because it is a safety issue.

Jul 01, 2017 | 2004 Volkswagen Touareg

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