A customer hears a popping noise when turning the steering wheel. What is the most likely cause?

The popping noise that a customer hears when turning the steering wheel is most likely caused by issues with the front tie rods. Tie rods are integral parts of the steering mechanism, connecting the steering gear to the steering arm on each wheel. They play a critical role in allowing the wheels to turn while providing necessary support for handling and alignment.

When front tie rods start to wear out or become damaged, often due to factors like excessive wear, corrosion, or improper vehicle maintenance, they can create a popping or clunking noise when the steering wheel is turned. This sound is typically the result of the increased play or movement within the tie rod ends, indicating that there is a loss of tightness, leading to the noise when the vehicle is in motion or when force is applied to the steering.

In contrast, the other components listed are less likely to cause a popping noise directly from the steering mechanism. Rear shock mounts and rear toe adjusters primarily impact the rear suspension and wheel alignment, while front shock mounts support the front suspension but don't directly influence steering articulation in the same way that tie rods do. Understanding these dynamics helps in diagnosing and addressing steering and suspension issues effectively.