How to remove that bumper on a smart roadster

Pop the Hatchback open and remove the connectors
from the top of the bumper cover.

Optional Step: Using a Floor Jack, raise both sides
of the car in the back, supporting both sides with
jack stands, and remove the rear wheels.

Using Torx Bits, remove the inner rear wheel well
lining.

Get behind the rear wheel well and loosen the bolts
holding the bumper brackets on. They're pretty
difficult to find and remove. Be Patient. Do the
same to the other side.

Remove the rear bumper cover by pulling the cover
outward from the part nearest the wheel on both
sides. Once removed, take off the 2 black mounting
brackets from the bumper cover.

Good Luck

You have to check to see the problem , the best way is to have it checked by proper diagnostic tool

1. Remove rear combination light assembly. A. Remove two mounting screws. B. Disconnect electrical connector from rear side of light assembly.

2. Remove bumper assembly. A. Remove four fasteners and four retaining screws from top of bumper assembly. B. Remove mud flap from bumper assembly. C. Remove two screws from bottom of bumper assembly. D. Remove two screws from side of bumper assembly. E. Remove four bumper mounting bolts from under of vehicle.
3. Install rear bumper in reverse order of removal.

please more details

Hi there:
Check this Removal Procedure...



1. Remove the rear bumper step pads.
2. Remove the license plate lamps.
3. Remove the nuts and the bolts that retain the rear bumper impact bar to the bumper bracket.
4. Remove the rear bumper impact bar from the vehicle.

Installation Procedure



Notice: Refer to Fastener Notice in Service Precautions.

1. Install the rear bumper impact bar to the vehicle as follows:

1.1. Position the bumper impact bar on the bumper brackets so that the holes in the impact bar are aligned with the bracket holes.
1.2. Install 2 bolt plates and 4 nuts on top of the impact bar.
1.3. Install 2 bolt and nuts through the bottom of the impact bar. Tighten the rear bumper impact bar nuts to 90 N.m (66 lb ft).

2. Install the license plate lamps.
3. Install the rear bumper step pads.


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Why do you need to remove engine ?

What does the dash show when you open the ignition

take help of the following steps to remove rear bumper on ur tucson.

Open the trunk of your vehicle.

1. Unscrew all the screws on the inside plastic trim that covers your bumper to trunk connection.
   
2. Pry the plastic piece out with a flathead screwdriver. You will expose the bolts that attach the rear bumper to the trunk.
   
3. Unscrew the bolts connecting to the inside of your rear bumper. There should be four bolts.
   
4. Unscrew the two to four screws connecting to your bumper from the inside of the rear wheel tire wells. These screws are on the area of the tire well that is closet to the bumper.
   
5. Slide under the rear of your car. Use a flathead screwdriver to pop the plastic rivets out of place along the underside of the rear bumper. There should be four to six rivets.
   
6. 
   Squat behind your car and firmly pull the bumper off. There will popping plastic sounds, this is the pop-in-place plastic rivets that are the last pieces that hold your rear bumper in place.
   

Rear Bumper: Service and Repair
REAR BUMPER
Removal and Installation
REMOVAL
1. Remove the LH and RH rear combination lamps.
2. Remove both the rear wheels and tires.
3. Remove the LH and RH splash shields.
4. Remove the rear bumper fascia clips and screws, then remove the rear bumper fascia.
5. Remove the rear energy absorbing foam.
6. Remove the rear bumper reinforcement.
7. Remove the rear bumper supports.
INSTALLATION
Installation is in the reverse order of removal.

1. Remove rear combination light assembly. A. Remove two mounting screws. B. Disconnect electrical connector from rear side of light assembly. 2. Remove bumper assembly. A. Remove four fasteners and four retaining screws from top of bumper assembly. B. Remove mud flap from bumper assembly. C. Remove two screws from bottom of bumper assembly. D. Remove two screws from side of bumper assembly. E. Remove four bumper mounting bolts from under of vehicle. 3. Install rear bumper in reverse order of removal.