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2006 Altima 2.5 P2A00 P0335 P0725 HELP Forums > > 2006 Altima 2.5 P2A00 P0335 P0725 HELP 2006 Altima 2.5 P2A00 P0335 P0725 HELP
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  #1  
Old 08-24-2020, 01:43 PM
Scode68 Scode68 is offline
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2006 Altima Sedan
2017 Sentra
 
Join Date: Aug 2020
Location: New Jersey
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Default 2006 Altima 2.5 P2A00 P0335 P0725 HELP

Hi, 2006 Altima with a 2.5 and I just replaced the exhaust pipe from the manifold to the and including the 2nd converter and O2 sensor. A week later I started getting the codes above and was wondering if they are all related to the upstream O2 sensor or a bad ground or something? Car has 108k on it and I've replaced the crankshaft position sensor 3 times over the past 5 years (not fun).


Car will randomly get a throttle position sensor code (pedal sensor) or transmission speed sensor code come up also but havnt seen those in a while.


And I did clear all codes and do the relearn steps but codes come back after 10-15 miles.

Last edited by Scode68; 08-26-2020 at 05:53 AM.
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Old 08-26-2020, 05:50 AM
Scode68 Scode68 is offline
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2006 Altima Sedan
2017 Sentra
 
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Location: New Jersey
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Do you think the P0725 is a false code for the crank shaft position sensor?



What can be causing the crankshaft position sensor to be going bad? As mentioned above I've replaced this 3 times already over the past 5 years. Car has 108k on it but it had the engine replacement recall at about 30k. Car is running fine with the SES light on.
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Old 08-29-2020, 06:51 AM
Scode68 Scode68 is offline
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2017 Sentra
 
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Okay, so I replaced the crankshaft position sensor again but after ten minutes the care threw a P2A00 code. Getting a new upstream O2 sensor but I feel like I'm just randomly throwing parts in here to try and make the SES light to stay off. This is now the 4th crank shaft position sensor replacement in 5 years. WTF?
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Old 09-29-2020, 07:11 AM
Scode68 Scode68 is offline
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2006 Altima Sedan
2017 Sentra
 
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So I'm still trying to hunt down the cause of this P2A00 code that keeps coming up after a few days. P2A00 = O2 Sensor range/performance bank 1 sensor 1. Car now has new upstream and downstream o2 sensors, MAS and spark plugs. Old plugs were clean but looked worn. I did all of the relearn prepossesses and don't see find any vacuum, intake or exhaust leaks.

Car runs and idles great other than the light coming on.

Any suggestions?
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Old 11-07-2020, 07:44 AM
Scode68 Scode68 is offline
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2017 Sentra
 
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so doing some checks on the downstream according to the manual.
  1. Continuity test between ECM terminal 25 and HO2S2 terminal 2 I should get something but I get nothing. Would the car even run if there was no continuity?
  2. Testing the new downstream O2 it says I should get 5.0-7.0 ohms at 77 degrees F. ts 66 out and Im only getting 3.5 ohms. Is this within reason or no good?
I am getting battery voltage #2 terminal of the O2 sensor 2. All the grounds I've checked so far are nice and clean.
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