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2005 Nissan Altima 2.5 L - P0420/P0300 - Cold Start Problems


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beall208395
New User

Jul 25, 2015, 9:35 AM

Post #1 of 3 (1188 views)
2005 Nissan Altima 2.5 L - P0420/P0300 - Cold Start Problems Sign In

Ok, I have a 2005 Nissan Altima that is throwing the codes P0420/P0300.

What happens is when you try to start the car while its cold (or hasn't been running in a while) it doesn't want to start. It takes about 4 to 5 turns of the key to get the baby to fire up. Once its started, it runs great.. and if I turn it off and turn it back on within a few mins of it being on it fires right back up with no misfire.

I'm thinking it's either a spark plug, spark plug wire, or a sensor.


What do you guys think?


beall208395
New User

Jul 25, 2015, 10:15 AM

Post #2 of 3 (1178 views)
Re: 2005 Nissan Altima 2.5 L - P0420/P0300 - Cold Start Problems Sign In

I think its the Camshaft Position Sensor.. I'm going to replace it and we will see if it fixes it.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 25, 2015, 2:20 PM

Post #3 of 3 (1169 views)
Re: 2005 Nissan Altima 2.5 L - P0420/P0300 - Cold Start Problems Sign In

I guess camshaft sensor replacement is as good a way to lose money as anything if you want to.


Perhaps find out what it missing now when it doesn't start. Since it can run well (you said) when warm what's missing when cold? Codes for random misfires and a catalytic converter not happy are probably side effects of the real problem.


Right when expected check fuel pressure up to spec and spark at all present. If highly predictable that it will not start after an amount of time prime it first and if it starts right up and stays running that's good info.


I think this engine is sensing it's already warmed up all the time but codes aren't telling sending you that direction. Maybe clear them and see which ones come back or get a more comprehensive code reading.


Your guess could be right I'm just not convinced it would so dependably fail that way?


T







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