My mercedes benz a160 elegance shown dtc 133 code and is not run more than 50 km per hour and not entered gear 3 and 4 pls someone help me

They have a problem with the froward gear brake drums cracking and there is a replacement/updated drum available but you would need an auto trans repairer to rebuild the transmission.

Disclaimer - beware - these little cars are very complex and easy to destroy computers.

1st option: No details re history so will assume it is in limp mode only driving in 2nd or reverse?
If so check fluid level in gearbox when hot -run for 20 minutes in driveway should do the trick. Find sealed filler hose and insert aftermarket dipstick. (There are youtube videos on how to make DIY one out of curtain spring wire) If level alright it will be valve body grunge and needs expert auto to clean. Otherwise add EXACTLY 500ml of synthetic fluid from Mercedes. try operating after heating gearbox as before. If good get auto serviced.

2nd option: Operate emergency Park release if Gear change not moving. remove gear change module cover and check connections in circuit board.
Very good website called Lofty's A160 page for DIYER's

The car is in "limp" mode.
You will only be able to access 2nd gear and reverse in order to get to workshop without causing damage. I have already answered on another page
http://www.fixya.com/cars/t27334566-a160_elegance_model_2001_5_door_hatch

go to https://big-manuals.com/ you will
get all info and solutions there definitely

This page should be helpful!
Bert Rowe Mercedes Benz class information Engine sensor locations

undo fill plug with a 3/8 rachet, fill until fluid comes out of fill plug hole

To set your time on an A160 follow the instructions below or follow the link to watch instruction video. http://youtu.be/nU3wtQ8A7Gc

How to Set Time on Mercedes-Benz A160

Adjusting the time:
Hold the time button pressed until the hour display flashes.
Adjust hours forward with the + button.
Adjust time backward with the - button.
Press the time button briefly. The minute will display will flash.
Adjust hours forward with the + button.
Adjust time backward with the - button.
Press the time button briefly and the newly set time is stored.

Hi there:
I suggest to use blow link for download manual for your Mercedes Benz: Interactive Guide

Also, this link could be interesting: mercedes-benz-a160-service-manual

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starter could need to be replaced just getting to week