B0509
Output Air Temperature Sensor 3 Circuit
B0509 is an OBD-II diagnostic trouble code meaning: Output Air Temperature Sensor 3 Circuit. Common causes: open or short circuit in wiring harness, air temperature sensor 3 malfunction. Estimated repair cost: $22–56.
Symptoms
- Incorrect operation of the climate control system
- Increased fuel consumption (if the sensor is connected to the intake)
- Incorrect air temperature readings on the display
Causes
- Open or short circuit in wiring harness
- Air temperature sensor 3 malfunction
- Poor contact in the sensor connector
- Problems with the control unit
How to Fix
- Check the integrity of the wiring harness and sensor connector
- Measure the sensor resistance (compare with the norm)
- Check voltage and ground in the sensor circuit
- Replace sensor if necessary
- Reset the error and check if it returns
Related codes
Error B0509 by Vehicle Brand
FAQ
What does the B0509 code mean?
B0509 is an OBD-II diagnostic trouble code that indicates: Output Air Temperature Sensor 3 Circuit
What causes a B0509 error code?
The most common causes of B0509 include: Open or short circuit in wiring harness; Air temperature sensor 3 malfunction; Poor contact in the sensor connector; Problems with the control unit.
How do I fix a B0509 diagnostic trouble code?
To fix B0509: Check the integrity of the wiring harness and sensor connector. Measure the sensor resistance (compare with the norm). Check voltage and ground in the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B0509?
Limited driving only, diagnose soon
How much does it cost to fix B0509?
The estimated repair cost for B0509 is $22–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat