If you perform any work on the steering, suspension or sensors, you can inadvertently set a C1201 Toyota trouble code. Great, how does that relate to a C1271? Common cause of a C1201 Toyota trouble code If the Toyota vehicle stability control system senses a wheel lock, a deceleration sensor or yaw sensor signal that indicates the vehicle is encountering a skid, swerve or is somehow going out of control, it operates the ABS brakes and reduces engine power to try and bring it back under control. So don’t go chasing wheel speed sensor issues if all you get is a C1201 code. Wheel speed sensors have a pretty high failure rate, but when they fail, they usually set an ABS-related trouble code. The ABS system gets its inputs from the wheel speed sensors. The Toyota stability control system gets inputs from the yaw sensor, deceleration sensor and the ABS system. How Toyota vehicle stability control works
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