Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Remove/Install Radar Sensor - AR30.30-P-1210LF
Model 217, 222
up to model year 2018
with code 233 (Adaptive cruise control Plus (DISTRONIC PLUS))
Model 217, 222
up to model year 2018
with code 237 (Active Blind Spot Assist)
Model 217, 222
up to model year 2018
with code 238 (Active lane keeping Assist)
Model 217, 222
up to model year 2018
with code 258 (Collision warning system with active brake application FCW-Stop)
Model 217, 222
up to model year 2018
with code 266 (DISTRONIC PLUS with Cross-Traffic Assist (DTR+Q))
Model 217, 222
up to model year 2018
with code 268 (Brake Assist System Plus)
Model 217, 222
up to model year 2018
with code 269 (Brake Assist PLUS with Cross-Traffic Assist (BAS+Q)
Model 217, 222
up to model year 2018
with code 271 (Autonomous brake intervention/pedestrian protection)
Model 217, 222
up to model year 2018
with code 300 (PRE-SAFE® Brake)
Shown on model 222
| Topical note | Notes on preventing damage to electronic components due to a magnetic tool | AH54.00-P-0002-01A | |
| Topical note | Information on preventing damage to electronic components due to electrostatic discharge | AH54.00-P-0001-01A | |
| Remove/install | |||
| 1 | Perform commissioning of COLLISION PREVENTION ASSIST controller unit (A90), front left bumper radar sensor (B29/2) or front right bumper radar sensor (B29/3) | When replacing COLLISION PREVENTION ASSIST controller unit (A90), front left bumper radar sensor (B29/2) or front right bumper radar sensor (B29/3). | |
| AD00.00-P-2000-04B | |||
| 2 | Remove impact absorber | Model 217 up to model year 2018 | AR88.20-P-2050LC |
| Model 222 up to model year 2018 | AR88.20-P-2050LFM | ||
| 3.1 | Detach electrical connection (1) from left front outer bumper radar sensor (B29/2) or right front outer bumper radar sensor (B29/3) | Model 217, 222 up to model year 2018 except code 258 (COLLISION PREVENTION ASSIST) |
|
| 3.2 | Disconnect electrical connection (1) on COLLISION PREVENTION ASSIST controller unit (A90) | Model 217, 222 up to model year 2018 with code 258 (COLLISION PREVENTION ASSIST) |
|
| 4.1 | Unlock retaining lugs (arrows) and bumper radar sensor at the front left (B29/2), or bumper radar sensor at the front right (B29/3) | Model 217, 222 up to model year 2018 except code 258 (COLLISION PREVENTION ASSIST) |
|
| 4.2 | Unlock retaining lugs (arrows) and remove COLLISION PREVENTION ASSIST controller unit (A90) | Model 217, 222 up to model year 2018 with code 258 (COLLISION PREVENTION ASSIST) |
|
| 5 | Install in the reverse order |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.