P0302 Cylinder 2 misfire


Asked by WAT Jun 17, 2010 at 01:39 AM about the 2001 Kia Rio Base

Question type: Maintenance & Repair

I have a P0302 fault (cylinder 2 misfire). I replaced the spark plugs just a week ago, and when I checked them today they all still look new, except for the cylinder 2 plug.  It is completely corroded on the top end (where it plugs into the spark plug wire).  I know there are a large variety of problems that could cause a cylinder misfire, however the condition of the new spark plug leads me to believe it is an ignition problem.  I replaced the ignition coil, checked all the spark plug wires for continuity between the coil and the plug, and replaced the corroded plug, yet I still get the P0302 code and the car still jerks and bucks on acceleration.  Anybody have any ideas on what else I can try, or why the plug is corroding so badly?

16 Answers


I have the same problem with a 2003 kia rio po302 # 2 misfire but also have code po113 , I don,t know if they affect one another po113 is a IAT senor that i replaced but all the plugs looked great and wires are pretty new if you fined out anything please let me know and i will do the same bob newjerseyguy64@comcast.net

6 out of 6 people think this is helpful.

I have the same problem with a 2011 kia rio. This has happened to me on 12/8/12 and 2/6/13. I keep getting the misfire codes...... Kia dealer saying its made gas.. The replaced two ignition coils on the two different cylinders on separate.. I dont trust this car. It is still under warranty.. I want to trade this car.....

8 out of 8 people think this is helpful.

I meant to say I have the same problem with a 2011 kia rio. This happened to me on 12/8/12 and 2/6/13. I keep getting the misfire codes.. The kia dealer saying its bad gas and only to use Shell gas. IT is still jerks when I put it in reverse and it stalls when I drive... The engine is off now but this is a bad sign off it is already messing up and it is still under warranty.. smh... I'm writing to the coporate office...

4 out of 4 people think this is helpful.

exact same thing happening to me KIA RIO 2011; when I'm at red lights it jerks and shakes for no reason I can figure out; also has the P0302 code; still under warranty and already has problems. Ridiculous!

4 out of 4 people think this is helpful.

i bet it is the fule fuilter

2 out of 2 people think this is helpful.

I have the same problem with my 2003 Rio. I changed all the wires, plugs, coil pack, and fuel filter! and still having the this problem!!

2 out of 2 people think this is helpful.

i have a 2009 reo, my no.1 misfires,i changed plug, put 1 can injection cleaner in ,2.5 gal fresh gas , still have problum, i m trying a new injector will let you know, sad i drove this car 14,000 miles now, im retired, and truble al ready.

Johnny Ochsner

I just had my engine rebuilt on my 2006 Kia Rio 12,200 miles ago, and randomly experienced misfires a little while back that seemed to go away after letting the car sit overnight. Now it happened again, just randomly as I accelerated from a red light, and am in the process of trying to figure this out. Really makes me mad!

3 out of 3 people think this is helpful.

I have a 2011 Kia Rio and the same exact thing. it was driving so perfect and one day it just suddenly started to jerk and almost konk out. The check engine light came on, and it appears to be running smooth again, the light is now off, but I am paranoid about what this could mean.

5 out of 5 people think this is helpful.
Christie Barney

I have

1 out of 1 people think this is helpful.
Christie Barney

I have a rio5 2009 and am also having the same problems with cylinder #1. I've had it in two garages in our home town and just brought it to a Kia dealer ship the other day. They replaced the plugs and were going to replace the coil but I already had it done before I went in and I am still having the excat problems. The light came on later that day I had take. It out of Kia garage. I've spent so much money on this problem but yet I can't get it fixed. If anyone has any ideas it would be greatly appreciated. You can send them to chbishop21@hotmail.com

1 out of 1 people think this is helpful.
Raymond Simpson

My 2009 kia rio is misfiring on 3 of its 4 cylinders and Its only at 52000 miles. According to the information I have compiled while researching this problem I have found that voluntary repossession of the vehicle and declaration of bankruptcy are likely the best course of action. The engine is gone yet I still owe $12,000?!? I'm getting lawyers.


I inherited a 2002 Kia Rio that was throwing codes that (Autozone, NAPA, and O'Reilly all agreed) showed either had to be Emissions related or the Crankshaft Position Sensor. Everyone agreed the most likely culprit was supposedly the latter issue. It turns out, after taking the car to a local service station, that one of the plugs for the ignition coil packs was broken. Since there seemed to be no schematics of this car, except for the electrical system, I ordered what I thought was the correct part (Ignition Coil Condensor). After spending $33, it turned out to be the wrong part. Although you won't find this information anywhere, the part doesn't seem to have a name, but is referred to as the "Ignition Coil Connector" and is a 2-way female plug coming from the Main Wire Harness that plugs directly into the Ignition Coil Pack. If you try to find this at any of the above mentioned auto parts stores, they will all tell you it is a dealer only part. If you call the dealer, they will try to sell you "Condensor" that I mentioned previously. If you finally give up and just take it into the dealer, they will charge anywhere from $200-500 to fix this. If you get disgusted "like me" and decide to continue your investigations, making several trips back and forth from your local service station (who is actually the most helpful) then you will eventually discover that these plugs can be purchased online for about $10. Here are the signs and symptoms of what I was experiencing: engine misfires, check engine light (codes - "see above"), difficulty starting, idling very rough, running very rough up towards 60mph (won't go over 60mph), speedometer stops working momentarily, car will stall if I don't give it gas while idling. These symptoms vanished when they taped the broken plug back into place. This is currently where I'm at while I wait on the correct plug to be ordered. I'll confirm everything in another post once I've got this part replaced correctly. I think I will go ahead and have both of these plugs replaced, since there seems to be a problem with them falling apart.


Another thing I forgot to mention. This plug may not necessarily fall apart and look like mine did in the photo I posted. In fact, this part was already malfunctioning before they removed it, at which point the plastic housing surrounding these female receptor (prongs) literally crumbled in their fingers. They had to tape it back on, which is why this photo is kind of difficult to comprehend (the tape is hiding the wires coming off the back of this plug that are wired into the Main Wire Harness). This damaged connector will have to be removed so that the new one can be spliced in its place.


I have a 2009 Kia Reo, starting in March 2013, first coil went out under warranty. Then Oct 2013, the remaining 3 coils went out, I was not out of miles for warranty but was over 5 year, by 3 months, they want almost $ 600.00 to fix, I explained that this is a product issue, this Is a 100% product failure, if you have 4 coils and 4 fail, and you are under 60,000 mile you have a product issue. This car is used only to drive to work, 5 years old and under 60,000 miles there is a product failure.


Correction to previous note last three coils went out in October 2014.

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