Car Diagnostics

Car pulls to one side while driving

Steering doesn't hold center — let go and the car drifts. Causes range from alignment to uneven tyre pressure.

A drift to one side can be mechanical (suspension geometry) or simply different tyre pressures. OBD-II plays a supporting role but gives useful hints.

Frequency ranking: (1) unequal tyre pressure left vs right; (2) alignment out of spec (camber/toe) — after a pothole or curb hit; (3) uneven brake pad wear (one caliper dragging); (4) worn tie rod end or ball joint.

OBD-II hints: C-codes from ESC/ABS during directional deviation, Steering Angle Sensor (SAS) PID — if SAS shows a non-zero angle while driving straight after calibration, alignment is off.

First diagnostic steps

  1. Check pressure in both front tyres — 7+ PSI difference causes pull
  2. Read SAS live PID — verify zero angle while driving straight
  3. Inspect tie rod ends and ball joints for play
  4. Check the brake caliper on the pull side for dragging
  5. Get a full alignment check on a proper rack

Likely fault codes

C0455C0460C0710C0800

Click a code for detailed description, causes, and diagnostic plan.