The adaptive cruise control sensor (radar unit) measures distance and closing speed to the vehicle ahead, letting the system automatically adjust speed to maintain a set following distance.
If you notice any of the following, the part likely needs replacement:
Adaptive cruise control warning light or message on the dashboard
System won’t engage or disengages unexpectedly
Inconsistent speed adjustments or following distance
Installation information
Mounted behind the front grille or bumper — requires a specific calibration procedure with diagnostic equipment after replacement.
Frequently asked questions
The radar sensor’s exact aim needs to be precisely known for the system to accurately judge distance and closing speed to vehicles ahead — even a small misalignment from bumper work can throw this off.
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August 2026
★★★★★
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Toyota Avensis
August 2026
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June 2026
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May 2026
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February 2026
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November 2025
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