Fault Code P0303....Again - Nissan Forum
SR-Series Engines (DE/VE) Engine Discussion: G20, 91-94 Sentra SE-R, NX2K, 95-98 200SX SE-R, 98-01 Sentra SE

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post #1 of 11 Old Oct 16th, 2007, 11:17 AM Thread Starter
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Question Fault Code P0303....Again

Hello there. Hopefully someone can help me save a bit of money here. I have a 2005 Nissan Sentra with only aboout 50K miles on it. About a month ago my Serive Engine Soon light came on. I was getting a fault code of P0303 (Cylinder 3 Misfire). I was then given a tune up where 2 of my spark plugs were replaced. The light went out and the car drove fine. Last week the light came on again. I brought the car back in and I'm still getting the same fault code (P0303). Now, I'm being told my ignition coil "might" need to be replaced. I'd hate to spend the money to replace it if the code it going to appear again. Then again, I'd hate to have to spend an addition $100 to have the dealership specify the problem and the ignition coil actully need to be replaced. Here's a bit more info. When starting my car early in the morning of if it's just been sitting for a few hours it trembles for a few seconds and then runs like normal. Could that be a better indication of what could be the problem.
Please Help!!

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post #2 of 11 Old Aug 6th, 2008, 05:19 PM
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I have same car with same year and 45K miles. Exact same issue/code as you. I have done tune-up and it was gone for few months. Now it is back again with P0303 code. What did you do to fix your car?
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post #3 of 11 Old Aug 13th, 2008, 11:50 PM
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Owner of a 2003 Sentra Spec-V. I am also having the same symptoms and getting the P0303 code. I'm curious if the OP or anyone else has resolved this issue. I am seeing this same code and problem pop up in a lot of searches on the web. I would appreciate anyone with some input chiming in on this subject. Thanks.
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post #4 of 11 Old Nov 16th, 2008, 07:42 PM
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SES light is making me crazy!

Hi, I've been reading TONS of posts online and I'm noticing that a lot of other people are having similar problems as I am. This is a long post, so please bear with me.

I have a 2004 Sentra with 133,000 miles. Yes, I know that's a lot, but I drive about 90-95 miles a day to work (round trip) and then if I want to do anything remotely fun on the weekend, well that adds more mileage. Anyway, I've been having a problem with my SES light and the P0303 code.

In August my SES light came on and stayed on for a few days. I took it to AutoZone and they did their computer check scan thing and told me it was code P0303 and recommended changing the spark plugs. So I bought new spark plugs and had them changed. The light went out for a few weeks. Then it came back on. I had to wait a few days to make an appointment with my local Nissan dealer and in the time I was waiting for my appointment, the light went out. I took it anyway and they said sometimes the code can be left in the system even if the light is out. So they did their scan too and told me the same thing, P0303 and suggested changing the coil and stuff for Cylinder 3. So they did it, the light went out and all was fine. For a few weeks. From the end of August until now, the light has gone off and on and off and on and off and on, you get the point! From time to time, I will get a sputtering feeling when I start the car. But once I give it gas and I get moving, it's fine and doesn't do that anymore. Looking for an answer once and for all, I took it to a different Nissan dealer. They ran the diagnostic test, gave me the same code. But at the same time, they tested it for any fuel pump, head gasket, spark plug issues and said they couldn't find anything. Said the only other issue would be electrical, but that could get really expensive and they don't want to fix it if they don't know 150% that it's the problem. The light has been out since my appointment last week, but yesterday it came back on again. And today when I drove to the grocery store and accelerated, the SES light decided to do something completely different and blink for less than 5 seconds. I thought my car was going to explode or something, but it stopped, the light stayed on and the car feels like it drives fine.

It's like my car is mocking me and saying "ha ha, I have a problem and I'm not going to tell you what it is, and I'm going to make it really hard to diagnose so when something does happen you're going to get stuck with a monster bill!" I'm SUPER frustrated with this and was hoping someone had some advice to offer.

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post #5 of 11 Old Jul 5th, 2010, 08:11 AM
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Sorry to open this up again but did you ever fix the problem you had. My car is acting the exact same way, it is a 2006 Nissan Sentra with 211,000 miles on it that runs great otherwise. I changed plugs (E3's) two weeks ago and then I changed the coil and neither one fixed the problem. I think I'm going to change plugs and use the Nissan dealership plugs and then go from there.
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post #6 of 11 Old Jul 7th, 2010, 07:24 PM
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Issue Resolved...Kinda

I did resolve my issue...I bought a new car.

I never did figure out what was going on with the P0303 code. I had the spark plugs changed, I had the head gaskets checked...everything. It was like my car had a mystery disease. The dealership I took it to suggested it could be an electrical problem and they could try to fix that, but it would be really costly.

I drove it for about another month and then got rid of it before the car completely died on me and my trade-in would be worthless.

Sorry I couldn't be more help. I remember how frustrating the problem was. If you ever find out whats going on, let me know. It's too late for me but I'd be interested to know what it could have been.
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post #7 of 11 Old Jul 9th, 2010, 09:47 PM
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I put Original Equipment plugs a couple of days ago and that did the trick. We'll have to see how it goes from here.
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post #8 of 11 Old Mar 25th, 2012, 03:19 AM
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Exact same problem as pullingmyhairout.....P303 problem comes and goes with my '04 SER SPEC-V.

I've replaced the spark plugs and coils (non-eom's), but problem persists. gatorgar55, did the eom's do the trick in the long run?

Could there possibly be a recall regarding this? I see many people with the same P303 problem.
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post #9 of 11 Old Jun 12th, 2012, 03:45 PM
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I am still googling.. but here is what I found so fart

- spark plugs
- coils
- pressure testing the cooling system (change tap)
- Head Gasket

I have changed my spark plugs, I am going to change my coil as next.
please let me know if you have more information.

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post #10 of 11 Old Jul 10th, 2013, 10:13 AM
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How clean of oil is the engine area?

Can be frustrating for sure! Lots of things can cause a misfire. Lots of things can make the computer think there has been one too.

I'd check for oil leaks next ! Many people just ignore them as an engine ages but that can reek havoc on the electronics. My engine had 5 or 6 good oil leaks after several of the gaskets and RTV sealant dried out and started failing when the car was 10 too 12 years old. RTV was used in place of gaskets on the oil pan and rear crankshaft seal plate, timing chain covers and distributor bridge. The Valve cover gasket is another thing that goes but it is really easy to replace so don't be to scared of tackling that one at all. The distributor O ring too just be careful to mark it to put it back as it was. Checking the timing after is a good idea too.

Now about the codes. I have a 95 200sx with the 1.6 L 4 cylinder and at start-up one morning I got the check engine light. That evening I plugged the code reader in and had four codes including a misfire code on cylinder 7. LOL Since I don't even have a 7th cylinder it was a bit easier to figure out I was likely getting some false codes here. Turns out I had too pull the distributor to replace the O ring oil seal and use electrical spray cleaner on several of the wiring harness plugs to remedy the trouble.

I headed in that direction because I did find a reference on line someplace that said that oil into the electrical connectors over time can cause false codes and several of mine where cover up with oil from that O ring leaking. Guess maybe they are right. They also said the electrical connector at the oil pressure sending unit is another place people often ignore. The little rubber boot that covers the connector can actually fill with oil holding the oil in the connection but not drip out much when the sending unit seal inside fails even when the sensor its self is still working. I have noticed that happen on two B14 Sentras I worked on previously but the computer was not showing any codes . . . well, not yet anyway! If you find any oil in that boot it is a cheap fix to just replace that sensor. I check mine every time I change the oil. On my engine its located right above the oil filter. Looks kind of like a small spark plug screwed right into the side of the block.

Best of luck.
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post #11 of 11 Old Jul 13th, 2013, 10:27 AM
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With this misfire problem can you feel the car misfiring at idle? Do Nissan have any pcm updates?
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