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  #1  
Old 08-21-2008, 04:23 PM
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Default 2002 altima stalling

I have an 2002 4 cylinder automatic 2.5s W/ 114k miles.
Only recall i havent done is the ECM reprogramming
codes: P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0725 Engine Speed input Circuit Malfunction
symtomes: cold start(mostly in the winter) it would take a couple of cranks to start.
lose of power while accelerating(more like a pause in power)
low speed cut off

is it the infamous crankshaft sensor that is the cause of all this

Last edited by wood; 08-27-2008 at 12:58 AM.
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  #2  
Old 08-21-2008, 04:48 PM
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yeah u might want to do the recall/s first to see if that will change anything, have u changed the sparks out, have the battery checked at advance auto parts or autozone. the p0420 code is pretty hard to tell since it could be a leak in the exhaust, bad catalyc converter or a bad o2 sensor.
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  #3  
Old 08-21-2008, 04:51 PM
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Service Engine Soon Light 05 Altima here is a link to a 2005 altima that has a p0725 code and u are right the crankshaft sensor needs to be replaced unless your car is good for the recall then u should do that first instead of buying it yourself.
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Old 08-21-2008, 04:59 PM
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Quote:
Originally Posted by sergey85 View Post
yeah u might want to do the recall/s first to see if that will change anything, have u changed the sparks out, have the battery checked at advance auto parts or autozone. the p0420 code is pretty hard to tell since it could be a leak in the exhaust, bad catalyc converter or a bad o2 sensor.
yes i did the spark plugs and the battery is about 1 yr old. i think on my next day off i will drop it off to get it reprogrammed the say it will take about an hour 1/2
thanx
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Old 08-21-2008, 05:04 PM
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u can do a search on here, just type the code, and u find alot of info on this. it says oil sometime gets in the sensor and messes it up. but they should havedone the reprogrram when u had the sensor put in. but have that done and let us know what happpens
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Old 08-27-2008, 12:55 AM
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well i just got the PO335 code yesterday(crankshaft position sensor). i dont think the dealer is going to replace it, so should i get this sensor from autozone or should i get the oem?
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Old 09-03-2008, 01:47 PM
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got a P0300 code today(Random/Multiple Cylinder Misfire Detected) . that is a total of 4 codes. i hope the reprogramming of the ecm will fix all of this. havent got the chance to take it in since they said it be a few hours for them to do it.
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Old 09-03-2008, 02:05 PM
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it should work the same
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Old 09-03-2008, 02:59 PM
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DO NOT BUY THE AFTERMARKET SENSOR!!!!!!!!
They are using the old style sensors. You will end up with the same problems you are having now.
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  #10  
Old 09-09-2008, 02:02 PM
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ok guys finally got the reprogamming done yesterday and after 30 miles the light came on w/ po335 and after an additional 50 miles i got a po725. what gives?
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  #11  
Old 09-09-2008, 02:40 PM
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did they perform the crankshaft sensor recall already for u??
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Old 09-09-2008, 04:06 PM
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i beleive i had them done a long time ago. when i went to the dealer recently all they said that had to be done was the reprogramming.

Last edited by wood; 09-10-2008 at 12:48 AM.
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  #13  
Old 09-09-2008, 04:07 PM
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well then u might have to replace the sensors or try to clear them and see if it comes back
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Old 09-15-2008, 06:34 AM
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Default 2002 altima stalling

If you are getting the 420 code I would get yourself to a dealer and have your cat converter checked ASAP. I lost an engine on that one when the cat went and debris was sucked into the engine.

Hopefully not the case for you.
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Old 09-19-2008, 06:17 PM
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well i bought the crank sensor today and made the attempt to replace it myself today.wrong move .... a couple of the other threads Ive read trying to locate where this sensor is said you can get to it from the top of the engine, well i found out you could only access it from the bottom and its closer to the passenger side of the car, also it isn't a 10mm bolt but a 12mm. all in all i couldn't do the job because i didn't have enough clearance to even get the sensor out. its 1 thing to get your hand in there and loosen the bolt but to get the sensor out is a whole other mission. some type of vacuum line is in the way which calls for me to remove that. i will have to go at this another day. i will try to get some pictures up. if anything Ive said is incorrect please correct me!
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