Check to be sure you plugged in the speed sensor on the transmission. If the ECU can not read the transmission speed through the output it will not allow the transmission to shift into the next gear. It should throw a code also.
SOURCE: 2003 nissan altima 2.5s transmission rough shift
Probably sensors! I have already replaced the crankshaft positioning sensor once, nissan replaced it once under recall and now it is bad again! Plus my speed sensor is bad too! Go to any part store and get diagnostic test ran, it will tell what sensors are bad.
SOURCE: 2003 Nissan Altima 2.5S, Check Engine Light Problem.
My service engine soon light came on saturday on my 2003 nissan altima 2.5s, took it to the dealer and he stated I need a Catalytic Converter for the light to go off. Last yr Jan I had the same thing happen and there was a recall on the ECM they reset it for free. Any suggestions? I am so tired of getting ripped off being a single woman. The repair price they gave me was $940, my mechanic says he can repair w/new converter total charge of $300
SOURCE: Nissan Altima 2000 - Engine oil leaking problem.
replace the front oil seal. first i would clean the engine with purple power (degrease etc.) then look at the engine and make sure the leak is not coming from above like possibly the valve cover gasket or from the oil sending unit. try to tighten the bolts on the valve cover and even the oil pan. you never know, you may get lucky. i don't know where you are but front seals are cheap but the labor on the job is what costs you.
SOURCE: 2006 Altima service engine light on, code 725
Check the SPARK plug condition, and AIR gap.
Regards,DT
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