Mazda CX-5 2018 Owner's Manual page 394

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If the rear bumper receives a severe impact, the system may no longer operate normally. Stop
the system immediately and have the vehicle inspected at an expert repairer, we recommend
an Authorised Mazda Repairer.
NOTE
The detection ability of the radar sensors (rear) has limitations. In the following cases,
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the detection ability may lower and the system may not operate normally.
The rear bumper near the radar sensors (rear) has become deformed.
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Snow, ice or mud adheres to the radar sensors (rear) on the rear bumper.
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Under bad weather conditions such as rain, snow and fog.
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Radar sensors (rear)