When your car drives straight before the alignment but pulls to one side after, the shop either set numbers to the wrong specs, was working with bad tires, or missed an underlying suspension problem. Here is how to diagnose and what to demand from the shop.
Any reputable alignment shop guarantees the work for at least 30 days. Bring the printout and have them re-check on the rack. The 5-minute fix is usually just a final tweak to caster or camber.
Caster controls steering feel. A 0.5 degree difference between left and right caster causes a strong pull. The shop's alignment sheet shows it instantly - bring the printout back.
Camber pulls the car toward the more positive (outward-leaning) side. A 0.4 degree camber difference creates a clear pull. Check the printout.
US roads slope right (crown). Many shops bias caster slightly to pull left, counteracting the crown so the car tracks straight. A new shop may have removed that bias.
A tire with a manufacturing defect (conicity) pulls the car one way regardless of alignment. Swap front tires side-to-side - if pull switches, it is the tire, not the alignment.
A bad ball joint, control arm bushing, or wheel bearing can give false alignment readings on the rack. The car looks aligned on the printout but pulls in motion.
| If you notice... | ...most likely cause |
|---|---|
| Pulls right on level road | Likely road crown or cross-camber off - check the printout |
| Pulls left on level road | Caster or camber spec mistake - rarely natural road crown |
| Steering wheel off-center when going straight | Toe was adjusted unevenly - 5-minute fix back at the shop |
| Pulls only at highway speed | Cross-caster issue, harder to feel below 50 mph |
| New noise from the front when turning | Suspension component disturbed during alignment - investigate |
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If your scan tool shows one of these alongside this symptom, that is your starting point. Click any code for the full diagnosis, common causes, and repair costs.
Zero on flat, smooth pavement. On a crowned road expect a very slight drift right that you barely correct. Anything more than that needs a re-check.
Most reputable shops include a 30-day warranty. Bring the printout and your concern - they should re-rack it at no charge.
Unlikely. Alignment work is non-destructive. But the rack inspection sometimes reveals existing wear (tie rods, ball joints) - bring up anything they flagged.
If the first shop refuses to honor their work, yes. A second shop should print a fresh sheet showing whatever was wrong.
Look for cross-caster (difference between L and R caster) and cross-camber. Both should be within 0.5 degrees of each other, ideally 0.3 or less.
Usually free if within warranty, $80-$120 if not. A four-wheel alignment is the more accurate option for any car with adjustable rear toe.