Why wont my nissan altima shift into overdrive

SOURCE: 94 Nissan Altima accelerator problems

check your throttle position sensor

SOURCE: 2002 nissan altima p0507 idle problem

I had the same problem before. after using the scanner i got a code number P0507. "Idle Air Control", New 2002 and up Nissan models like my Altima don't have an idle valve or sensor like older models to be replace. Here's the solution " Replace your "Throttle Chamber" the idle sensor is build in it, there is no other way to fix this problem. the throttle chamber is about $175.00 at your Nissan Dealer. The need your core or you will need to pay extra money. No need for expensive mechanic shop, you could do this your self. the throttle chamber is so easy to remove, four screws holds it together. I will take you about ten to twenty minutes to replace it. Please trust me and you will save big bucks!!!!!

SOURCE: MAINTENANCE REPAIR ON HIGH MILEAGE NISSAN ALTIMA

Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. Some problems are minor, but if not addressed it could become major. The list of possible codes number in the hundreds. The code itself doesn't tell exactly what component is defective - it only indicates where to look, or what engine parameter is out of normal range. You or a technician will have to perform further testing to pinpoint cause and the proper repair. Even if you reset the light, if the underlying problem is not addressed it will come back on.

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SOURCE: Tranny wont shift into third gear.

you have to pull down the oil pan of the tranny. then take out the strainer inside attached to the tranny. dirt is clogging it making the sometimes shift and other not.

SOURCE: 04 nissan sentra shifting hard

Do you have a CVT? (Continuosly Variable Transmission) I doubt that you do so if you dont, nissans are known to have hard shift into second gear you mean.(Once the car moves, its already in first gear) so if it shifts fine into other gears, I wouldnt worry too much unless it gets worse.