Question about 2002 Mitsubishi Galant
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
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Posted on Jan 02, 2017
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
So you have a P0421.
A code P0421 may mean that one or more of the following has happened:
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
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