diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 09c364049ad70..dc1eab6aa4d8c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -47436,9 +47436,6 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                         if (flags & ModifierFlags.Accessor) {
                             return grammarErrorOnNode(modifier, Diagnostics._0_modifier_already_seen, "accessor");
                         }
-                        else if (flags & ModifierFlags.Readonly) {
-                            return grammarErrorOnNode(modifier, Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "accessor", "readonly");
-                        }
                         else if (flags & ModifierFlags.Ambient) {
                             return grammarErrorOnNode(modifier, Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "accessor", "declare");
                         }
@@ -47458,7 +47455,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                             return grammarErrorOnNode(modifier, Diagnostics.readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature);
                         }
                         else if (flags & ModifierFlags.Accessor) {
-                            return grammarErrorOnNode(modifier, Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "readonly", "accessor");
+                            return grammarErrorOnNode(modifier, Diagnostics._0_modifier_must_precede_1_modifier, "readonly", "accessor");
                         }
                         flags |= ModifierFlags.Readonly;
                         break;
diff --git a/tests/baselines/reference/autoAccessorAllowedModifiers.js b/tests/baselines/reference/autoAccessorAllowedModifiers.js
index 204bdf2b5d55b..6e50a5440a046 100644
--- a/tests/baselines/reference/autoAccessorAllowedModifiers.js
+++ b/tests/baselines/reference/autoAccessorAllowedModifiers.js
@@ -16,6 +16,7 @@ abstract class C1 {
     accessor 108: any;
     accessor ["m"]: any;
     accessor n!: number;
+    readonly accessor o: any;
 }
 
 class C2 extends C1 {
@@ -44,6 +45,7 @@ class C1 {
     accessor 108;
     accessor ["m"];
     accessor n;
+    accessor o;
 }
 class C2 extends C1 {
     accessor e;
diff --git a/tests/baselines/reference/autoAccessorDisallowedModifiers.errors.txt b/tests/baselines/reference/autoAccessorDisallowedModifiers.errors.txt
index d9b841ee69892..5debef7574daf 100644
--- a/tests/baselines/reference/autoAccessorDisallowedModifiers.errors.txt
+++ b/tests/baselines/reference/autoAccessorDisallowedModifiers.errors.txt
@@ -1,20 +1,22 @@
 autoAccessorDisallowedModifiers.ts(2,14): error TS1030: 'accessor' modifier already seen.
-autoAccessorDisallowedModifiers.ts(3,14): error TS1243: 'accessor' modifier cannot be used with 'readonly' modifier.
-autoAccessorDisallowedModifiers.ts(4,13): error TS1243: 'accessor' modifier cannot be used with 'declare' modifier.
-autoAccessorDisallowedModifiers.ts(5,14): error TS1029: 'public' modifier must precede 'accessor' modifier.
-autoAccessorDisallowedModifiers.ts(6,14): error TS1029: 'private' modifier must precede 'accessor' modifier.
-autoAccessorDisallowedModifiers.ts(7,14): error TS1029: 'protected' modifier must precede 'accessor' modifier.
-autoAccessorDisallowedModifiers.ts(8,14): error TS1029: 'abstract' modifier must precede 'accessor' modifier.
-autoAccessorDisallowedModifiers.ts(9,14): error TS1029: 'static' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(3,13): error TS1243: 'accessor' modifier cannot be used with 'declare' modifier.
+autoAccessorDisallowedModifiers.ts(4,14): error TS1029: 'public' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(5,14): error TS1029: 'private' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(6,14): error TS1029: 'protected' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(7,14): error TS1029: 'abstract' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(8,14): error TS1029: 'static' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(9,5): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(10,5): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(11,5): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(12,5): error TS1275: 'accessor' modifier can only appear on a property declaration.
-autoAccessorDisallowedModifiers.ts(13,5): error TS1275: 'accessor' modifier can only appear on a property declaration.
-autoAccessorDisallowedModifiers.ts(14,15): error TS1276: An 'accessor' property cannot be declared optional.
-autoAccessorDisallowedModifiers.ts(15,14): error TS1243: 'readonly' modifier cannot be used with 'accessor' modifier.
-autoAccessorDisallowedModifiers.ts(16,14): error TS1243: 'declare' modifier cannot be used with 'accessor' modifier.
-autoAccessorDisallowedModifiers.ts(20,14): error TS1029: 'override' modifier must precede 'accessor' modifier.
-autoAccessorDisallowedModifiers.ts(24,5): error TS1070: 'accessor' modifier cannot appear on a type member.
+autoAccessorDisallowedModifiers.ts(13,15): error TS1276: An 'accessor' property cannot be declared optional.
+autoAccessorDisallowedModifiers.ts(14,14): error TS1029: 'readonly' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(15,14): error TS1243: 'declare' modifier cannot be used with 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(18,7): error TS18052: Non-abstract class 'C2' does not implement all abstract members of 'C1'
+autoAccessorDisallowedModifiers.ts(19,14): error TS1029: 'override' modifier must precede 'accessor' modifier.
+autoAccessorDisallowedModifiers.ts(19,23): error TS4113: This member cannot have an 'override' modifier because it is not declared in the base class 'C1'.
+autoAccessorDisallowedModifiers.ts(23,5): error TS1070: 'accessor' modifier cannot appear on a type member.
+autoAccessorDisallowedModifiers.ts(26,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(27,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(28,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(29,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
@@ -23,66 +25,67 @@ autoAccessorDisallowedModifiers.ts(31,1): error TS1275: 'accessor' modifier can
 autoAccessorDisallowedModifiers.ts(32,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(33,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(34,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
+autoAccessorDisallowedModifiers.ts(34,25): error TS2792: Cannot find module 'x'. Did you mean to set the 'moduleResolution' option to 'nodenext', or to add aliases to the 'paths' option?
 autoAccessorDisallowedModifiers.ts(35,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
-autoAccessorDisallowedModifiers.ts(35,25): error TS2792: Cannot find module 'x'. Did you mean to set the 'moduleResolution' option to 'nodenext', or to add aliases to the 'paths' option?
 autoAccessorDisallowedModifiers.ts(36,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
 autoAccessorDisallowedModifiers.ts(37,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
-autoAccessorDisallowedModifiers.ts(38,1): error TS1275: 'accessor' modifier can only appear on a property declaration.
 
 
-==== autoAccessorDisallowedModifiers.ts (30 errors) ====
+==== autoAccessorDisallowedModifiers.ts (31 errors) ====
     abstract class C1 {
         accessor accessor a: any;
                  ~~~~~~~~
 !!! error TS1030: 'accessor' modifier already seen.
-        readonly accessor b: any;
-                 ~~~~~~~~
-!!! error TS1243: 'accessor' modifier cannot be used with 'readonly' modifier.
-        declare accessor c: any;
+        declare accessor b: any;
                 ~~~~~~~~
 !!! error TS1243: 'accessor' modifier cannot be used with 'declare' modifier.
-        accessor public d: any;
+        accessor public c: any;
                  ~~~~~~
 !!! error TS1029: 'public' modifier must precede 'accessor' modifier.
-        accessor private e: any;
+        accessor private d: any;
                  ~~~~~~~
 !!! error TS1029: 'private' modifier must precede 'accessor' modifier.
-        accessor protected f: any;
+        accessor protected e: any;
                  ~~~~~~~~~
 !!! error TS1029: 'protected' modifier must precede 'accessor' modifier.
-        accessor abstract g: any;
+        accessor abstract f: any;
                  ~~~~~~~~
 !!! error TS1029: 'abstract' modifier must precede 'accessor' modifier.
-        accessor static h: any;
+        accessor static g: any;
                  ~~~~~~
 !!! error TS1029: 'static' modifier must precede 'accessor' modifier.
-        accessor i() {}
+        accessor h() {}
         ~~~~~~~~
 !!! error TS1275: 'accessor' modifier can only appear on a property declaration.
-        accessor get j() { return false; }
+        accessor get i() { return false; }
         ~~~~~~~~
 !!! error TS1275: 'accessor' modifier can only appear on a property declaration.
-        accessor set k(v: any) {}
+        accessor set j(v: any) {}
         ~~~~~~~~
 !!! error TS1275: 'accessor' modifier can only appear on a property declaration.
         accessor constructor() {}
         ~~~~~~~~
 !!! error TS1275: 'accessor' modifier can only appear on a property declaration.
-        accessor l?: any;
+        accessor k?: any;
                   ~
 !!! error TS1276: An 'accessor' property cannot be declared optional.
-        accessor readonly m: any;
+        accessor readonly l: any;
                  ~~~~~~~~
-!!! error TS1243: 'readonly' modifier cannot be used with 'accessor' modifier.
-        accessor declare n: any;
+!!! error TS1029: 'readonly' modifier must precede 'accessor' modifier.
+        accessor declare m: any;
                  ~~~~~~~
 !!! error TS1243: 'declare' modifier cannot be used with 'accessor' modifier.
     }
     
     class C2 extends C1 {
+          ~~
+!!! error TS18052: Non-abstract class 'C2' does not implement all abstract members of 'C1'
+!!! related TS2515 autoAccessorDisallowedModifiers.ts:7:23: Non-abstract class 'C2' does not implement inherited abstract member 'f' from class 'C1'.
         accessor override g: any;
                  ~~~~~~~~
 !!! error TS1029: 'override' modifier must precede 'accessor' modifier.
+                          ~
+!!! error TS4113: This member cannot have an 'override' modifier because it is not declared in the base class 'C1'.
     }
     
     interface I1 {
diff --git a/tests/baselines/reference/autoAccessorDisallowedModifiers.js b/tests/baselines/reference/autoAccessorDisallowedModifiers.js
index bdb7d73d0d9d2..4e79d0b4783d5 100644
--- a/tests/baselines/reference/autoAccessorDisallowedModifiers.js
+++ b/tests/baselines/reference/autoAccessorDisallowedModifiers.js
@@ -3,20 +3,19 @@
 //// [autoAccessorDisallowedModifiers.ts]
 abstract class C1 {
     accessor accessor a: any;
-    readonly accessor b: any;
-    declare accessor c: any;
-    accessor public d: any;
-    accessor private e: any;
-    accessor protected f: any;
-    accessor abstract g: any;
-    accessor static h: any;
-    accessor i() {}
-    accessor get j() { return false; }
-    accessor set k(v: any) {}
+    declare accessor b: any;
+    accessor public c: any;
+    accessor private d: any;
+    accessor protected e: any;
+    accessor abstract f: any;
+    accessor static g: any;
+    accessor h() {}
+    accessor get i() { return false; }
+    accessor set j(v: any) {}
     accessor constructor() {}
-    accessor l?: any;
-    accessor readonly m: any;
-    accessor declare n: any;
+    accessor k?: any;
+    accessor readonly l: any;
+    accessor declare m: any;
 }
 
 class C2 extends C1 {
@@ -44,17 +43,16 @@ accessor import N2 = N1;
 //// [autoAccessorDisallowedModifiers.js]
 class C1 {
     accessor accessor a;
-    accessor b;
+    accessor c;
     accessor d;
     accessor e;
-    accessor f;
-    accessor static h;
-    accessor i() { }
-    accessor get j() { return false; }
-    accessor set k(v) { }
+    accessor static g;
+    accessor h() { }
+    accessor get i() { return false; }
+    accessor set j(v) { }
     constructor() { }
+    accessor k;
     accessor l;
-    accessor m;
 }
 class C2 extends C1 {
     accessor g;
diff --git a/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorAllowedModifiers.ts b/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorAllowedModifiers.ts
index 0c7bb3d1ad94f..b7e3f9ae341cf 100644
--- a/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorAllowedModifiers.ts
+++ b/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorAllowedModifiers.ts
@@ -16,6 +16,7 @@ abstract class C1 {
     accessor 108: any;
     accessor ["m"]: any;
     accessor n!: number;
+    readonly accessor o: any;
 }
 
 class C2 extends C1 {
diff --git a/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorDisallowedModifiers.ts b/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorDisallowedModifiers.ts
index ba188a70dc25e..5576c1f6ac388 100644
--- a/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorDisallowedModifiers.ts
+++ b/tests/cases/conformance/classes/propertyMemberDeclarations/autoAccessorDisallowedModifiers.ts
@@ -3,20 +3,19 @@
 
 abstract class C1 {
     accessor accessor a: any;
-    readonly accessor b: any;
-    declare accessor c: any;
-    accessor public d: any;
-    accessor private e: any;
-    accessor protected f: any;
-    accessor abstract g: any;
-    accessor static h: any;
-    accessor i() {}
-    accessor get j() { return false; }
-    accessor set k(v: any) {}
+    declare accessor b: any;
+    accessor public c: any;
+    accessor private d: any;
+    accessor protected e: any;
+    accessor abstract f: any;
+    accessor static g: any;
+    accessor h() {}
+    accessor get i() { return false; }
+    accessor set j(v: any) {}
     accessor constructor() {}
-    accessor l?: any;
-    accessor readonly m: any;
-    accessor declare n: any;
+    accessor k?: any;
+    accessor readonly l: any;
+    accessor declare m: any;
 }
 
 class C2 extends C1 {