OBD2 code C0821: Air system/suspension
Air suspension fault.
Detected Root Component
Chassis Component
Observed Symptoms
- Rigid or uncomfortable suspension
- Excessive body roll when cornering
Possible Causes
- Defective sensor
- Faulty solenoid valve
- Faulty mixing flap actuator
- Faulty BCM module
Tools Required
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Parts likely to be the cause (Capteur ABS)
Capteur ABS
Photo d'illustration : Capteur ABS
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Frequently asked questions about code C0821
What does code C0821 mean? ▾
OBD2 code C0821: Air system/suspension. Air suspension fault.
What are the symptoms of code C0821? ▾
Code C0821 may cause: Rigid or uncomfortable suspension, Excessive body roll when cornering. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code C0821? ▾
The most common causes of code C0821 are: Defective sensor, Faulty solenoid valve, Faulty mixing flap actuator, Faulty BCM module. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code C0821? ▾
Code C0821 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.
How do I fix code C0821? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Defective sensor, Faulty solenoid valve, Faulty mixing flap actuator, Faulty BCM module. Difficulty: Medium · Estimated time: 30-60min.