Codes The check engine light is on, I checked and it show codes No. 12, 21, 34, what means these codes and how can fix the problem? Thanks

Question edited for clarity.
Question moved to sub category.

It sounds like you are in Limp Mode. Check for DTC Codes on a professional grade scan tool computer. It will show the diagnostics and the codes show the fix.

Most Complete List For Nissan Check Engine Light Codes

https://www.engine-light-help.com > nissan-check-engi...
More than just a list of Nissan Check Engine Light Codes! ... Below you will find the most complete list of Nissan trouble codes available.

Nissan Maxima OBDII Codes Meaning ' Engine-Codes.com ' P1

https://www.engine-codes.com > model > maxima
Description, Diagnostic and Repair Information for Nissan Maxima OBD2-OBDII Engine Codes ' Engine-Codes.com ' Page 1.

• 
  

  Nissan OBD2-OBDII Codes Definition, Description and Repair

  https://www.engine-codes.com > make > nissan
  Browse NISSAN codes by model and year · B0001 NISSAN 11,966 Views. Driver Air Bag Module · B0002 NISSAN 5,433 Views. Driver Air Bag Module · B0010 NISSAN 5,316 ...

Do you mean the Check Engine Light? If so you need to get the engine codes read with a OBD code reader! This is the only way to be sure of the problem area!

Try going to your local Autozone store and ask them to check
your vehicle for emissions and other engine problems.
This is a free service. They will show you a print out of the probable causes of the problem you are having and the cost of the parts you need to fix your vehicle.

There is error code stored in your cars computer.It has to be scanned to retrieve the codes stored in it.I suggest you to click the help links shown below :----Check Engine Light On car? http://schematicsdiagram.blogspot.com/2011/06/check-engine-light-on-car.html
--------------After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure? http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html
------------After replacing throttle body the Check engine light starts blinking? http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html
-----------How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
-------------Check engine light with codes P2195 and P2197? http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
------------Car jerks while going uphill and Check engine light is ON? http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html
-----------Vehicle smog test failed Due to NO MIL/check engine light? http://schematicsdiagram.blogspot.com/2011/12/vehicle-smog-test-failed-due-to-no.html
-----------This will help.Thanks.

When the check engine light is flashing it means that the computer has detected a misfire in the engine.It is not good to drive a vehicle that has a flashing check engine light; one or more sensor in your vehicle is advise about an code fault. I suggest scanning for know what code is in there and solve it.

In some vehicles, a red check-engine light means the car needs absolute immediate attention while a yellow check-engine light means you need to make an appointment soon. The light is used to indicate PCM (Powertrain Control Module) problems that are associated with your vehicle's emissions system.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

You have to reset the check engine light. It will erase all the bad codes that you have fixed. To do this, you have to remove the positive battery cable for a minute or so and reconnect. It should clear the check engine light..

p1405 is a egr code (upstream hose off or pluged)

It's a very strange code. It shows up in the generic "all manufacturer" code list as "P0601 Internal Control Module Memory Check Sum Error"
Here's a complete list and you can see the GM specific codes on that site as well.

http://www.engine-light-help.com/generic-check-engine-light-codes.html

there are a couple things. The check engine light came on for a reason. First how many miles on the speedometer?

email me back

I would definately take it back to the dealer and tell them they have not fixed the problem. The Dealer will hook the car up to the ODB II tester to get the codes from your cars computer as to what the computer thinks the problem is. Typically there is more than one oxygen sensor on the exahust system and the dealer ship may have replaced one and need to replace both - or they may have replaced one that was not faulty.

IF the check engine light went out when you left the dealer it is likely because they disconnected the battery when they worked on the car. The computer will then check a problem that shows up several times before lighting the check engine light (typically three cycles I believe - i.e. at least three consecutive starts and stops where the computer sees the same problem) so seeing the light out when it leaves the dealership does not mean they have fixed it, it merely means they have disconnected the battery. You should be well within your rights to go back and tell them they have not solved the problem and your not paying additional money for replacements of parts that didn't fix the problem.

As a check you should also take the car to a local Autozone (Car parts shop) and ask them to check the codes using the ODB II meter. At least then you can go to the dealer with the knowledge of what the computer code is and sound more knowledgable and less likely to be ripped off for poor workmanship.