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As with most sensors, there are certain conditions under which detection issues can occur. The owner/driver's attention should be drawn to the driver's handbook to avoid misunderstandings as to what is, and isn't, a fault.

Detection issues may occur;

When driving on a different line to the vehicle in front
When vehicles edge into your lane
When going into or coming out of a bend
With detecting motorcycles
With detecting stationary objects, such as traffic queues, broken down vehicles, etc.

In circumstances such as these, the ACC system may brake late or unexpectedly, or may increase speed. This is not a fault , but is the system reacting to detection issues.

The owner's handbook makes it clear that the system should only be used under suitable conditions, but technicians should be wary of wasting time on complaints which are not actually faults.

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.

Safety Warning

Speed Control - Diagnostic Procedures: Detection

Use the Manual With the Right Hardware

When to See a Mechanic