Discussion
After a bumper repair, a blind spot warning illuminates constantly with no vehicle alongside, and the repair included metallic paint over the sensor area.
Which cause is most likely?
Answer: A
Metallic flake reflects and scatters the beam so the sensor sees returns that are not there. Approved materials and a limited paint thickness exist precisely to prevent this. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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