Where the hit landed tells you whether the steering took any of it
Start with the point of impact, because it predicts the answer better than anything you feel from the driver’s seat. A tap to the centre of the rear bumper in DVP stop-and-go traffic loads the bumper reinforcement and the crush cans and rarely gets anywhere near a wheel. A strike on a front corner is different. The bumper corner wraps around just ahead of the front wheel, so a hit there can push the wheel back, twist the knuckle, or bend the outer tie rod that steers it.
Side impacts near a wheel are the other common culprit. A sideswipe merging onto the 404 that leaves a scrape along the front fender and the tire sidewall has very likely shoved that wheel sideways. So has a slide on black ice that ended with the tire hitting a curb, even at walking pace. The rubber absorbs some of it, and the rest goes into the suspension arms.
If the damage stops at the bumper cover or the trunk and nothing touched the tires, an alignment is usually not on the estimate. If anything did, assume it belongs there until a printout says otherwise.
A pull, a crooked steering wheel or feathered tread means something moved
You can often feel a knocked-out alignment before anyone measures it. The spokes of the wheel tilt left or right while the car is going straight down the lane. The car drifts toward one lane line on a flat stretch of the 401 and needs a constant small correction. The steering feels heavier turning one way than the other. Over the following weeks the front tires can start to wear unevenly, with one edge smooth and the other still showing full tread, or a saw-tooth feel when you run your palm across the blocks.
Each of those symptoms points at the same thing: a wheel is aimed somewhere other than where its specification says, and a mechanical cause usually sits behind it. Some cars also throw a stability-control or lane-assist warning after a hit, because the steering angle sensor no longer agrees with where the wheels are pointing.
- Steering wheel tilted when the car tracks straight.
- A steady drift to one side on a level road.
- One front tire wearing on its inner or outer shoulder.
- A new clunk over speed bumps in a plaza lot or over the potholes on a side street.
- A warning light for stability control or lane keeping that was not there before the collision.
The alignment printout is a diagnosis, not a repair
An alignment machine reads three angles at each wheel: camber, the tilt of the tire seen from the front; caster, the tilt of the steering axis seen from the side; and toe, whether the tires point slightly in or out. It also reads the thrust angle, which shows whether the rear axle is steering the car crabwise. Each reading comes out as a number against the manufacturer’s range.
What matters after a collision is which numbers will not come back. Toe is adjustable on almost every car, and a tie rod that has only shifted will set back to spec. Camber and caster are fixed or barely adjustable on many modern cars, so a corner that reads well outside range and will not move tells the technician a part is bent: a control arm, a strut, a knuckle or the subframe it bolts to. Forcing the other angles to compensate leaves a car that drives straight for a week and eats a tire by spring.
That is why a body shop orders the alignment check early, once the damaged corner is visible, and not only at the end. If the first reading points at a bent arm, the part goes on the estimate as a supplement and the insurance company approves it before the car is reassembled. If it points at the structure itself, the car goes on the measuring bench, which the frame damage answer explains.
Driver-assist cameras and radar rely on the car pointing where the wheels point
On a car with lane-keeping, adaptive cruise or automatic braking, the alignment has a second job. The forward camera behind the windshield and the radar in the grille are aimed relative to the car’s thrust line, the direction the rear wheels push the car. If that line is off, a camera can be calibrated perfectly to a target board and still look slightly sideways down the highway.
Many manufacturers therefore set the order: correct the alignment first, reset the steering angle sensor, then calibrate the camera or radar if the procedure calls for it. Recalibration may be required after front-end or suspension work; it depends on the car and on what was disturbed, and the scan and the repair procedure decide it rather than a rule of thumb.
For drivers coming off the 404 at Sheppard, the practical point is simple. When an estimate lists an alignment and a calibration as sublets, they are linked steps in that order, not two charges for the same thing.
Questions people ask
My car drives fine after a front-corner hit. Can I skip the alignment check?
You can, but a bent tie rod often shows up only as tire wear weeks later. On a corner hit the check is cheap insurance, and if the insurance company is paying for the repair, a needed alignment belongs on the claim.
Will a regular tire shop alignment fix collision damage?
It will reset whatever is adjustable. If a part is bent, a careful tire shop will tell you the angles will not come into range, and that printout is useful evidence for the claim. A shop that simply adjusts around it has hidden the problem.
Does the alignment come before or after the bodywork?
Usually both. A first reading during teardown finds bent parts so they can be ordered, and a final alignment happens after the suspension is reassembled and before any camera or radar calibration.