OBD-II code · Chassis
C054A Vacuum Sensor A Range/Performance
Vacuum Sensor A Range/Performance: the signal is implausible or outside the valid range.
Is it safe to drive with C054A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor reading drifted
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Vacuum Sensor A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.