C121E
Brake Pressure Sensor Comparative Performance
C121E is an OBD-II diagnostic trouble code meaning: Brake Pressure Sensor Comparative Performance. Common causes: brake pressure sensor malfunction, problems in the wiring harness. Estimated repair cost: $56–167.
Symptoms
- ABS/ESP light is on
- Reduced braking performance
- Incorrect operation of the stabilization system
Causes
- Brake pressure sensor malfunction
- Problems in the wiring harness
- ABS control unit malfunction
- Contamination of sensor contacts
How to Fix
- Check pressure sensor readings using a diagnostic scanner
- Inspect the wiring harness for damage
- Check sensor contacts for oxidation
- If necessary, replace pressure sensors or ABS control unit
Related codes
FAQ
What does the C121E code mean?
C121E is an OBD-II diagnostic trouble code that indicates: Brake Pressure Sensor Comparative Performance
What causes a C121E error code?
The most common causes of C121E include: Brake pressure sensor malfunction; Problems in the wiring harness; ABS control unit malfunction; Contamination of sensor contacts.
How do I fix a C121E diagnostic trouble code?
To fix C121E: Check pressure sensor readings using a diagnostic scanner. Inspect the wiring harness for damage. Check sensor contacts for oxidation. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C121E?
Limited driving only, diagnose soon
How much does it cost to fix C121E?
The estimated repair cost for C121E is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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