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I bought a new car from the NISSAN official car dealer, after 6 days (used less than 400km), engine light is on, then the repair centre cannot find out the reason, then just cancel the light, then after drive 2-3 times, light on again, the repair centre cannot find out the reason, then just cancel the light and add a black box, then drive 2-3 times, the light on again, the repair centre checked and need to change a new gear box.
I lost confidence in the car and requested for a refund or change the car, the dealer said no already,  is it possible?  or what else I can get?  I am frustrated.  

Well I believe you have to pay minimum a year at this point in order for you to trade it in and get another one. I don't think it's possible for a refund as you already signed the contract. I would just hang on and wait the year to avoid any problems. If anything else you can get a lawyer and ask if you can do anything but not sure.  
Life....it's not about how hard you can hit but how hard you can get hit and keep pushing forward, how much you can take and keep pushing forward! - Rocky Balboa

Sounds like a classic lemon law case. If the dealer cannot fix the problem, by law they have to replace the vehicle. The same thing happened to me when I purchased a chrysler years ago. The engine light started coming on about three weeks after I bought the car, then it started suddenly turning off when I was coming to a stop.
The dealer couldn't fix the problem after I had taken it in about five times, so I quoted the lemon law to them and they replaced the car, at no charge to me.  

Back in 2004, I leased a new Nissan Frontier 4X4.  Because I wanted the rare 6 speed manual, I did the paperwork first and the truck was delivered a few days later.  On delivery, there were a few problems: the tail lights didn't work, the stereo had a blown front speaker, and there were few rattles.  The dealer did a competent job of fixing these items, but it did lead me to suspect all was not well with this particular vehicle.  So much for Nissan's reputation for quality (the earlier Nissans I owned were all excellent cars).

The 4.0 V-6 had great get up and go - but also returned 9 (yes, nine) MPG for the first 12,000 miles.  Several dealers could not find anything wrong with the vehicle.

The upholstry on the driver's seat cushion and side bolster had packed it in after three months.  Apparently, no one involved in the seat design process considered that guys who drive trucks wear Levi's jeans.  Seat replaced under warranty, and the replacement seat went the distance.  

At 12K, the manual transmission packed it in.  A bent shift fork had the poor dear stuck in 4th gear.  I have owned manual transmission vehicles for 20 years, and had never seen anything like it.  The local dealer had the truck for two weeks while a new transmission was on back order.  In their defense, Nissan was kind enough to provide me with a rental car.  When the truck was returned, fuel economy went to a more acceptable 17 MPG, solving the thirst problem.

The truck had obviously been screwed together under a bad sign, and I was loosing patience with it.  I called Nissan to inquire about ending the lease early.  After a number of phone calls, I eventually got an answer.  The lease could be ended, but only if the value of the vehicle could be determined, but the value of the vehicle could be determined only if the lease was ended - a classic Catch 22.  My calls to NMAC ended when I was told "you're stuck with it, and we don't care" (their words, not mine).  Calls and letters to Nissan's HQ were not returned.  I got the impression that dealing with a dissatisfied customer wasn't something Nissan knew how to do very well.

I waited it out, and the lease was finally up.  NMAC insisted they didn't control their own lease return process, and that I had to return to truck to the original dealer (35 miles away) rather than the dealer down the street from my office.  It was a final insult added to a horrid three year lease.

I'm sorry that your new car purchase isn't working out as you expected.  There's a couple of things that you can do:  trade it in, immediately, and get yourself a Honda or a Ford (those guys have quality control AND customer service); continue to let the dealer replace parts under the waranty until the problem goes away; or invest in a bit of electical tape and cover up the light.  I also suggest a couple of magnetic signs for the doors and trunk that say "This Nissan is a Lemon".  I would send you mine, but I left them on the truck when I returned it to the dealer.  

yes it sounds like a lemon law to me too
i unfortunately found out about that law too late as i was browsing through some papers and law articles i needed.
i also had a car a few years ago that from the minute i bought it did nothing but trouble. the dealer did try to fix it at first but then he just started blaming me for bad driving and wouldnt do anything else about it.  

rayleung82004:
I bought a new car from the NISSAN official car dealer, after 6 days (used less than 400km), engine light is on, then the repair centre cannot find out the reason, then just cancel the light, then after drive 2-3 times, light on again, the repair centre cannot find out the reason, then just cancel the light and add a black box, then drive 2-3 times, the light on again, the repair centre checked and need to change a new gear box.
I lost confidence in the car and requested for a refund or change the car, the dealer said no already,  is it possible?  or what else I can get?  I am frustrated.

What?!  They couldn't pull the code and find the fault and fix it?  I'd say, under the circumstances, take the offer of a new gearbox, see if that fixes it, and, if not, see what you can do with the Lemon Laws in your state/country.  

i don't think the country he lives in has lemon laws.  I noticed that when he said he had less than 400 kms.  Could be from Canada but I doubt if they have the same type of law up there.  Much as I hate to think it, he might be screwed. One very good reason why I never bought Nisan's even though my wife's cousin could have gotten it at employee prices.  

So what happened??? were you able to fix the Nissan or get a new one or what??  
Life....it's not about how hard you can hit but how hard you can get hit and keep pushing forward, how much you can take and keep pushing forward! - Rocky Balboa