C109F
Vacuum Sensor Signal Fault
C109F is an OBD-II diagnostic trouble code meaning: Vacuum Sensor Signal Fault. Common causes: vacuum sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.
Symptoms
- Unstable engine operation at idle
- Increased fuel consumption
- Check Engine Light Illuminates
- Problems with the brake system (if the sensor is connected to it)
Causes
- Vacuum sensor malfunction
- Open or short circuit in wiring harness
- Poor contact in connectors
- Leaks in vacuum lines
- Blockages in vacuum lines
How to Fix
- Check the integrity of the vacuum sensor wiring harness and connectors
- Check the vacuum sensor for malfunctions
- Check vacuum lines for leaks and blockages
- Replace the vacuum sensor if necessary
- Clean or replace vacuum lines if problems are found
Related codes
FAQ
What does the C109F code mean?
C109F is an OBD-II diagnostic trouble code that indicates: Vacuum Sensor Signal Fault
What causes a C109F error code?
The most common causes of C109F include: Vacuum sensor malfunction; Open or short circuit in wiring harness; Poor contact in connectors; Leaks in vacuum lines.
How do I fix a C109F diagnostic trouble code?
To fix C109F: Check the integrity of the vacuum sensor wiring harness and connectors. Check the vacuum sensor for malfunctions. Check vacuum lines for leaks and blockages. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C109F?
Limited driving only, diagnose soon
How much does it cost to fix C109F?
The estimated repair cost for C109F is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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