OBD2 CODE

C0121 Chassis (C)

We do not have a full sheet for this code yet, with its causes and checks. What you see here comes from the OBD2 code standard.

Name taken from the open OBDex code list (public domain).

What do I do now?

If the engine light flashes, the car loses a lot of power, overheats or the brakes fail, stop somewhere safe and call for assistance.
If the car drives normally, book a garage and show them this code: its exact meaning and the cause depend on each model.
Tell us what you notice: the diagnosis takes the code, your car and the symptoms into account.

This code does not point to the engine, the brakes or the transmission: you will see the X-ray car with no area marked.

Marea ABS valve-relay faultBrakes and safety

Engine / equipment: Only configurations, equipment and VINs included in the documented assignments.
Period mentioned: Repairer-sheet period/subversions stated in each assignment.
Symptoms: C0121 valve-relay code; verify diagnosis and installed ABS.
Possible cause described: ECU Repair Centre reports C0121 valve-relay faults in the Marea Kelsey-Hayes module; it does not specify the underlying internal component.
Check for the garage: Confirm module reference and diagnose C0121; check the circuit before sending the module to a specialist for evaluation/repair.
Cost cited in the source: No verifiable estimate; request a diagnostic and repair quotation.A rough figure from the original database, not an up-to-date quote.