Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2016 Subaru BRZ Series.HyperBlueFACTORY OEM SERVICE PROCEDURE

Description of functions

Diagnostic codes	DTC detecting conditions	Faulty part
C1237	Outputs from the speed sensors at 4 wheels are all different. Speed sensor signal pulse error for 3 wheels or more. ABS control continues for long time Vehicle stability control continues for a long time	Tire size error Speed sensor Speed sensor rotor Wiring harness or connector Skid control computer (brake actuator assembly)

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.