diff --git a/hardware/opentrons_hardware/sensors/sensor_driver.py b/hardware/opentrons_hardware/sensors/sensor_driver.py
index ac40ddf0c11..84780695e66 100644
--- a/hardware/opentrons_hardware/sensors/sensor_driver.py
+++ b/hardware/opentrons_hardware/sensors/sensor_driver.py
@@ -243,7 +243,7 @@ def __init__(
 
     async def __aenter__(self) -> None:
         """Create a csv heading for logging pressure readings."""
-        self.data_file = open(self.data_file, "a")
+        self.data_file = open(self.data_file, "w")
         self.csv_writer = csv.writer(self.data_file)
         self.csv_writer.writerows([self.file_heading, self.sensor_metadata])