diff --git a/selfdrive/car/chrysler/values.py b/selfdrive/car/chrysler/values.py
index 084aef2aa9..70818ec982 100644
--- a/selfdrive/car/chrysler/values.py
+++ b/selfdrive/car/chrysler/values.py
@@ -1,5 +1,5 @@
 from enum import IntFlag
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from typing import Dict, List, Optional, Union
 
 from cereal import car
@@ -60,7 +60,7 @@ RAM_CARS = RAM_DT | RAM_HD
 @dataclass
 class ChryslerCarInfo(CarInfo):
   package: str = "Adaptive Cruise Control (ACC)"
-  car_parts: CarParts = CarParts.common([CarHarness.fca])
+  car_parts: CarParts = field(default_factory=CarParts.common([CarHarness.fca]))
 
 
 CAR_INFO: Dict[str, Optional[Union[ChryslerCarInfo, List[ChryslerCarInfo]]]] = {
diff --git a/selfdrive/car/docs_definitions.py b/selfdrive/car/docs_definitions.py
index 23b460147e..ee40a65244 100644
--- a/selfdrive/car/docs_definitions.py
+++ b/selfdrive/car/docs_definitions.py
@@ -1,5 +1,6 @@
 import re
 from collections import namedtuple
+import copy
 from dataclasses import dataclass, field
 from enum import Enum
 from typing import Dict, List, Optional, Tuple, Union
@@ -144,6 +145,9 @@ DEFAULT_CAR_PARTS: List[EnumBase] = [Device.three]
 class CarParts:
   parts: List[EnumBase] = field(default_factory=list)
 
+  def __call__(self):
+    return copy.deepcopy(self)
+
   @classmethod
   def common(cls, add: List[EnumBase] = None, remove: List[EnumBase] = None):
     p = [part for part in (add or []) + DEFAULT_CAR_PARTS if part not in (remove or [])]
@@ -225,7 +229,7 @@ class CarInfo:
   auto_resume: Optional[bool] = None
 
   # all the parts needed for the supported car
-  car_parts: CarParts = CarParts()
+  car_parts: CarParts = field(default_factory=CarParts)
 
   def init(self, CP: car.CarParams, all_footnotes: Dict[Enum, int]):
     self.car_name = CP.carName
diff --git a/selfdrive/car/ford/values.py b/selfdrive/car/ford/values.py
index 664c56cf2d..1c4c38c6f2 100644
--- a/selfdrive/car/ford/values.py
+++ b/selfdrive/car/ford/values.py
@@ -1,5 +1,5 @@
 from collections import defaultdict
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from enum import Enum
 from typing import Dict, List, Set, Union
 
@@ -70,7 +70,7 @@ class Footnote(Enum):
 @dataclass
 class FordCarInfo(CarInfo):
   package: str = "Co-Pilot360 Assist+"
-  car_parts: CarParts = CarParts.common([CarHarness.ford_q3])
+  car_parts: CarParts = field(default_factory=CarParts.common([CarHarness.ford_q3]))
 
   def init_make(self, CP: car.CarParams):
     if CP.carFingerprint in (CAR.BRONCO_SPORT_MK1, CAR.MAVERICK_MK1):
diff --git a/selfdrive/car/mazda/values.py b/selfdrive/car/mazda/values.py
index 3fbf34e5fe..37d1b31569 100644
--- a/selfdrive/car/mazda/values.py
+++ b/selfdrive/car/mazda/values.py
@@ -1,4 +1,4 @@
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from typing import Dict, List, Union
 
 from cereal import car
@@ -37,7 +37,7 @@ class CAR:
 @dataclass
 class MazdaCarInfo(CarInfo):
   package: str = "All"
-  car_parts: CarParts = CarParts.common([CarHarness.mazda])
+  car_parts: CarParts = field(default_factory=CarParts.common([CarHarness.mazda]))
 
 
 CAR_INFO: Dict[str, Union[MazdaCarInfo, List[MazdaCarInfo]]] = {
diff --git a/selfdrive/car/nissan/values.py b/selfdrive/car/nissan/values.py
index 8d0728c33d..1ba88ac7b1 100644
--- a/selfdrive/car/nissan/values.py
+++ b/selfdrive/car/nissan/values.py
@@ -1,4 +1,4 @@
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from typing import Dict, List, Optional, Union
 
 from cereal import car
@@ -33,7 +33,7 @@ class CAR:
 @dataclass
 class NissanCarInfo(CarInfo):
   package: str = "ProPILOT Assist"
-  car_parts: CarParts = CarParts.common([CarHarness.nissan_a])
+  car_parts: CarParts = field(default_factory=CarParts.common([CarHarness.nissan_a]))
 
 
 CAR_INFO: Dict[str, Optional[Union[NissanCarInfo, List[NissanCarInfo]]]] = {
diff --git a/selfdrive/car/subaru/values.py b/selfdrive/car/subaru/values.py
index 8bd66c30f9..03ae176023 100644
--- a/selfdrive/car/subaru/values.py
+++ b/selfdrive/car/subaru/values.py
@@ -1,4 +1,4 @@
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from enum import IntFlag
 from typing import Dict, List, Union
 
@@ -59,7 +59,7 @@ class CAR:
 @dataclass
 class SubaruCarInfo(CarInfo):
   package: str = "EyeSight Driver Assistance"
-  car_parts: CarParts = CarParts.common([CarHarness.subaru_a])
+  car_parts: CarParts = field(default_factory=CarParts.common([CarHarness.subaru_a]))
 
 
 CAR_INFO: Dict[str, Union[SubaruCarInfo, List[SubaruCarInfo]]] = {
diff --git a/selfdrive/car/toyota/values.py b/selfdrive/car/toyota/values.py
index 887625322b..86e8f07e96 100644
--- a/selfdrive/car/toyota/values.py
+++ b/selfdrive/car/toyota/values.py
@@ -1,5 +1,5 @@
 from collections import defaultdict
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from enum import Enum, IntFlag
 from typing import Dict, List, Union
 
@@ -102,7 +102,7 @@ class Footnote(Enum):
 @dataclass
 class ToyotaCarInfo(CarInfo):
   package: str = "All"
-  car_parts: CarParts = CarParts.common([CarHarness.toyota])
+  car_parts: CarParts = field(default_factory=CarParts.common([CarHarness.toyota]))
 
 
 CAR_INFO: Dict[str, Union[ToyotaCarInfo, List[ToyotaCarInfo]]] = {
diff --git a/selfdrive/car/volkswagen/values.py b/selfdrive/car/volkswagen/values.py
index b8fb173cfe..d13d8f330d 100755
--- a/selfdrive/car/volkswagen/values.py
+++ b/selfdrive/car/volkswagen/values.py
@@ -1,5 +1,5 @@
 from collections import defaultdict, namedtuple
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from enum import Enum
 from typing import Dict, List, Union
 
@@ -176,7 +176,7 @@ class Footnote(Enum):
 @dataclass
 class VWCarInfo(CarInfo):
   package: str = "Adaptive Cruise Control (ACC) & Lane Assist"
-  car_parts: CarParts = CarParts.common([CarHarness.j533])
+  car_parts: CarParts = field(default_factory=CarParts.common([CarHarness.j533]))
 
   def init_make(self, CP: car.CarParams):
     self.footnotes.append(Footnote.VW_EXP_LONG)