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Old 03-16-2017, 08:09 PM
 
Location: Los Angeles (Native)
25,304 posts, read 18,325,622 times
Reputation: 12234

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Been having some issues with my vehicle recently.

I had a check engine light come on and I have an OBD 2 scanner I bought recently. The codes that came up said it was a fuel air sensor that needed to be replaced so I took it to dealer and they said the same thing and replaced it . Then less than a week later I get the engine light flashing and the car is running rough.

I got code 0303 cylinder misfire . I looked it up and it was saying it could be an ignition coil and spark plugs. It's a 10 year old car that I bought used last year with a lot of miles .

I'm wondering though is it somehow possible that the computer thought it was the fuel air sensor because of the worn ignition coil and spark plugs ? Since spark plugs are related to the air fuel mixture ?..

I haven't had too many issues with check engine lights in the past, so just wondering if this is a possibility . Too late now since there repair is done and I paid but just curious

It just seems the timing is weird . Car has about 155,000 miles.. it's a 2007 Nissan Versa and I don't know when the spark plugs were changed . The timing could of been a coincidence .
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Old 03-16-2017, 10:47 PM
 
7,698 posts, read 8,114,461 times
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Start by changing the spark plugs and wires.
If you can't do it take it down to the high school automotive shop or vocational high school automotive shop. Buy the parts and have them put on.
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Old 03-16-2017, 11:46 PM
 
Location: Earth
797 posts, read 582,878 times
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Possibly. Change out the plugs first,go from there.
Be careful,if those plugs have never been changed,they could possibly snap and fall into the head area. That will be a P IN the a88 to get. Soak them up with either penetrate oil or wd40 to loosen them up before hand. Let that sit at least 8 hrs before attempting to change the plugs.
The coils and all that are fairly easy,your better off getting the parts on amazon. Theres OEM websites as well that tend to be cheaper than dealer. Just google "Nissan OEM parts"
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Old 03-17-2017, 05:41 AM
 
Location: Colorado Springs
6,455 posts, read 7,056,742 times
Reputation: 22249
I had an old GM car throw a misfire code at 160K miles and I fixed it by replacing the ignition wires.

Try that.
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Old 03-17-2017, 05:53 AM
 
Location: central NH
421 posts, read 396,240 times
Reputation: 284
It's possible to have multiple things to go out at once. It happens.

I'd do the plugs and work from there. It might be worthwhile to replace the coil on the cylinder it is tossing a code for; I think this has coil on plug, right? has to come off. If the coil is cheap, might as well. Something of a shotgun fix, but sometimes it's nice to trade cash for quick results, rather than spend the time to diagnosis to the exact cause.
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Old 03-17-2017, 07:39 AM
 
13,091 posts, read 14,890,024 times
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I think a 2007 Nissan was using coils by that point. I also think the plug change interval was 110K miles.


With 155K miles, I'd change the spark plugs out, and swap around a few coils and then reset the codes and drive the car around. If the coil is the culprit, it will reappear on the cylinder you swapped the #3 coil pack to. At that point, I'd change the coil.



I think the nissans all use NGK Platnium plugs as their OEM plug around that vintage. Usually $10/plug or so at a parts store.
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Old 03-17-2017, 08:56 AM
 
5,443 posts, read 5,850,843 times
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I believe with that code, it would be cylinder #3 with the misfire. To test, you could swap plugs from cylinder 3 with cylinder 4, clear the code and then see if you get another misfire. If it is the plug, the code should generate as 0304. If the code stays the same, swap the coil pack and try again. Anyways, since the misfire is only in the 1 cylinder, swap stuff around to help isolate what is actually causing the problem instead of just throwing parts/money at it.
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Old 03-17-2017, 05:44 PM
 
426 posts, read 357,145 times
Reputation: 310
catalytic converter
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Old 03-17-2017, 09:15 PM
 
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Quote:
Originally Posted by ihatedcu View Post
catalytic converter
Converter is p0420 or p0430, NOT p0303.

Don in Austin
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