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Home >> BMW >> 2025 >> 230i >> Repair and Diagnosis >> External Pages >> Different car >> Section 278 (Distance Systems, Cruise Control -- Repair M4 (G82 & G83)) >> 66 31 Active Cruise Control (Acc) >> 66 31 111 Adjusting the front radar sensor (M4 2021-2023) >> Adjusting the front radar sensor (FRS)

Adjusting the front radar sensor (FRS)

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NOTE: TECHNICAL INFORMATION 
Notes on the adjustment of the ACC sensor are a fundamental requirement for these repair instructions and must be complied with at all times.
For additional information see: 66 31... NOTES ON ADJUSTING THE ACC SENSOR .
NOTE: TECHNICAL INFORMATION 
If there is a "Sensor misadjusted" fault memory entry and a correct sensor alignment using the adjustment screw is not possible, there is a suspicion of front impact damage.
In this case, the vehicle must be carefully inspected for damage. If necessary, damaged parts must be replaced. Then adjust the ACC sensor again.
A damaged/bent holder indicates a mechanical misuse of the vehicle and will not be considered to be a warranty case.

Checking the vehicle and components for damage 

Check 

Result 

» Damage or deformation.

Measure

Result 

» No damage or deformation

Measure

Adjust front radar sensor (FRS).

NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.

Standard tools: 

Screwdriver for hexagon socket SW3 

G15341392Courtesy of BMW OF NORTH AMERICA, INC.
G15341393Courtesy of BMW OF NORTH AMERICA, INC.

Screwdriver for hexagon socket SW3

(Shaft length> 90mm)