Improper alignment is not necessarily the cause of steering problems. Tire lead, due to worn or improperly manufactured tires, is another possibility. Lead is the car's deviation from a straight path on a level road without pressure on the steering wheel. Refer to Vehicle Leads/Pulls in Suspension General Diagnosis.

Ensure correct readings and proper alignment adjustments by performing the following checks before making any adjustments.

1. Check all of the tires for proper inflation pressures.
2. Inspect the tires for consentient tread wear.
3. Check the hub and bearing assemblies for excessive wear. Correct if necessary.
4. Check the condition of the ball joints and tie rod ends. Correct any excessively loose conditions before adjusting the alignment.
5. Check for excessive run-out of the wheels and tires.
6. Check the vehicle trim height. Correct the specification, if necessary, before adjusting alignment.
7. Check the Electronic Level Control system for proper operation.
8. Check for any improperly operating strut dampers.
9. Check for any loose control arms.
10. Check for any loose or missing stabilizer bar attachments.
11. Give consideration to excess loads. Tool boxes, sample cases, etc. which are normally carried should remain in the car during the alignment.
12. Follow the manufacturers instructions regarding the equipment used for the alignment.
13. The car must be on a level surface fore-and-aft and sideways regardless of the equipment used in order to adjust the alignment.