2006 Altima service engine light on, code 725

you need a better mechanic that traces ALL of the possibilities of each code, not just read the code and trow in a part hoping that it's fixed ~ it can be wiring as well, not just plug in a new part as mentioned on the 2nd trouble code to the vehicle speed sensor

P0744 Torque Converter Clutch Circuit Intermittent


P0722 Output Speed Sensor No Signal

the first of the 2 looks to be more intensive to trace and find out the problem & the 0722 is the easier job for an intermediate mechanic to trace the wiring for continuity

If you are using more gas than usual I would be checking the air mass sensor on the hose between the air cleaner and your throttle body. From what you describe being hard to start and running erratically . Sometimes they can be cleaned with an air mass sensor solvent. Be careful not to try cleaning or touching the sensor with anything other than the spray. If on visual inspection the bimetallic sensor has not cleared it will need replacing.

This is normally caused by the Crank Sensor. The Engine Speed signal is given by the Crank sensor, not the vehicle speed sensor. Most people get confused and replace the speed sensor instead.

So to resolve your problem you will need to replace the crank sensor. The engine speed sensor code is always related to the crank sensor failure.

Thanks Jay!

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.

if its a po725 code its engine speed fault ,replace crank sensor.for vehicle speed there are two identical sensors near each other on trans....one called revolution sensor other is called turbine speed sensor.

You need to get a scanner hooked up to read what error code you have, as there are hundreds, and go from there.

http://www.obd-codes.com/trouble_codes/

Plug out all the sensors at the bottom where you sprayed it down and blow out all the plugs on the inside

..Above 200.. 200 what? MPH..KPH.?. its NONE of their business how fast you drive!!

Get a Lawyer.. they will respond... it might cost you $100..

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.