diff --git a/selfdrive/car/subaru/fingerprints.py b/selfdrive/car/subaru/fingerprints.py
index 25fc2a0aa9..aaee2e1c71 100644
--- a/selfdrive/car/subaru/fingerprints.py
+++ b/selfdrive/car/subaru/fingerprints.py
@@ -54,7 +54,7 @@ FW_VERSIONS = {
       b'\xa1  \x02\x01',
       b'\xa1  \x02\x02',
       b'\xa1  \x03\x03',
-      b'\xa1\\  x04\x01',
+      b'\xa1  \x04\x01',
     ],
     (Ecu.eps, 0x746, None): [
       b'\x9b\xc0\x11\x00',
@@ -373,7 +373,6 @@ FW_VERSIONS = {
       b'\x00\x00c\xb7\x1f@\x10\x16',
       b'\x00\x00c\xd1\x1f@\x10\x17',
       b'\x00\x00c\xec\x1f@ \x04',
-      b'\x00\x00c\xec7@\x04',
     ],
     (Ecu.engine, 0x7e0, None): [
       b'\xa0"@\x80\x07',
@@ -447,9 +446,9 @@ FW_VERSIONS = {
   },
   CAR.OUTBACK: {
     (Ecu.abs, 0x7b0, None): [
-      b'\xa1 \x06\x02',
       b'\xa1  \x06\x00',
       b'\xa1  \x06\x01',
+      b'\xa1  \x06\x02',
       b'\xa1  \x07\x00',
       b'\xa1  \x07\x02',
       b'\xa1  \x08\x00',
diff --git a/selfdrive/car/subaru/tests/test_subaru.py b/selfdrive/car/subaru/tests/test_subaru.py
new file mode 100644
index 0000000000..c8cdf66065
--- /dev/null
+++ b/selfdrive/car/subaru/tests/test_subaru.py
@@ -0,0 +1,20 @@
+from cereal import car
+import unittest
+from openpilot.selfdrive.car.subaru.fingerprints import FW_VERSIONS
+
+Ecu = car.CarParams.Ecu
+
+ECU_NAME = {v: k for k, v in Ecu.schema.enumerants.items()}
+
+
+class TestSubaruFingerprint(unittest.TestCase):
+  def test_fw_version_format(self):
+    for platform, fws_per_ecu in FW_VERSIONS.items():
+      for (ecu, _, _), fws in fws_per_ecu.items():
+        fw_size = len(fws[0])
+        for fw in fws:
+          self.assertEqual(len(fw), fw_size, f"{platform} {ecu}: {len(fw)} {fw_size}")
+
+
+if __name__ == "__main__":
+  unittest.main()