Question about 2002 Nissan Altima

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I put my scanner on mother's car 2002 altima got code PO-725

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Does the vehicle shift funny? The code means engine speed signal which is probably the vehicle speed sensor is defective. It is located on the transmission where the speedometer cable used to go. Is located under the hood by the firewall.

Posted on Nov 11, 2008

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Transmission problems


to many codes try to trick the trans computerif it is isolated unpug and read codes or take the positive wire off and leave it off for a few minutes and try your scanner again and see what it says.

Jan 24, 2013 | Cars & Trucks

1 Answer

Check engine light is on in my 2005 altima 2.5 got it scanned and the codes i got were P0335 /P0725/P0420 also car keeps stalling


po335 and 725 bad crank sensor and this is also reason for stalling.po 420 catalyst has lost efficiency....needs new catalytic converter ...covered under 8year 80000 mile emmisions warranty.

Feb 08, 2011 | 2005 Nissan Altima

1 Answer

2002 nissan altima.stopped at stop light and engine quit.started right back but idled very low while in gear.cleaned throttlebody,now engine idle fluctuates from 500rpms to 2000rpms.has several...


when this is done idle air volume needs to be relearned .to my knowledge dealer only procedure .i could be wrong but i dont think aftermarket scanner software supports this.more good news.po420 you need a cata lytic converter.p2135 and po 123 you need a new throttle chamber assembly.

Jan 20, 2011 | Nissan Altima Cars & Trucks

2 Answers

What is an code po300 and po420 and what do i need to do i have an 2002 nissan altima


The p0300 code is a random missfire code sometimes caused by bad spark plugs and wires, if you have not done a tune up, it's time for one. now, the p0420 code is for catalyst efficiency below threshold, basically, your catalytic converter is bad and may need to be replaced. Sometimes repairing the random missfire can eventually clear the p0420 code. your car is not burning fuel properly, therefore the catalytic converter is getting dirty. Also, if you notice blue smoke coming out the tail pipe, then that's the cause for a failing catalytic converter as oil is getting to the combustion chamber and being burned off through the exhaust.

Mar 09, 2010 | 2002 Nissan Altima

1 Answer

2002 jetta tdi, got code po 725, p1780, p1850. Transmission starts in second gear and will not go in to fourth gear. Any help? Thank you


i had a few of these pop up. The PCM and the ECM had a brain fart. Have the codes cleared and if you have the same luck as me all will be back to normal. That was the fix...

Dec 22, 2009 | 2001 Volkswagen Jetta TDI

2 Answers

My 05 altima has several error codes..335 (02,04,and 05) and 725 (01 and 03). The car acts like the starter may be going bad. Would these codes support that problem?


No those codes would not support a bad starter diagnosis.

And those are not correct codes for a 2005....codes should be a 4 digit code

Dec 07, 2009 | 2005 Nissan Altima

1 Answer

2006 Altima service engine light on, code 725


Check the SPARK plug condition, and AIR gap.
Regards,DT

Aug 26, 2009 | Nissan Altima Cars & Trucks

2 Answers

2002 nissan altima 4 cyl


this is a evap code. it needs to be diagnosed. it could be a bad gas cap try that first and clear the codes

Oct 10, 2008 | 2002 Nissan Altima

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