diff --git a/test/functional/feature_mnehf.py b/test/functional/feature_mnehf.py
new file mode 100755
index 0000000000..b3d611706c
--- /dev/null
+++ b/test/functional/feature_mnehf.py
@@ -0,0 +1,184 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2023 The Dash Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+import struct
+from io import BytesIO
+
+from test_framework.authproxy import JSONRPCException
+from test_framework.key import ECKey
+from test_framework.messages import (
+    CMnEhf,
+    CTransaction,
+    hash256,
+    ser_string,
+)
+
+from test_framework.test_framework import DashTestFramework
+from test_framework.util import (
+    assert_equal,
+    assert_greater_than,
+    get_bip9_details,
+)
+
+class MnehfTest(DashTestFramework):
+    def set_test_params(self):
+        extra_args = [["-vbparams=testdummy:0:999999999999:12:12:12:5:0"] for _ in range(4)]
+        self.set_dash_test_params(4, 3, fast_dip3_enforcement=True, extra_args=extra_args)
+
+    def skip_test_if_missing_module(self):
+        self.skip_if_no_wallet()
+
+    def restart_all_nodes(self):
+        for inode in range(self.num_nodes):
+            self.log.info(f"Restart node {inode} with {self.extra_args[inode]}")
+            self.restart_node(inode, self.extra_args[inode])
+        for i in range(self.num_nodes - 1):
+            self.connect_nodes(i + 1, i)
+
+    def create_mnehf(self, versionBit, pubkey=None):
+        # request ID = sha256("mnhf", versionBit)
+        request_id_buf = ser_string(b"mnhf") + struct.pack("<Q", versionBit)
+        request_id = hash256(request_id_buf)[::-1].hex()
+
+        quorumHash = self.mninfo[0].node.quorum("selectquorum", 100, request_id)["quorumHash"]
+        mnehf_payload = CMnEhf(
+            version = 1,
+            versionBit = versionBit,
+            quorumHash = int(quorumHash, 16),
+            quorumSig = b'\00' * 96)
+
+        mnehf_tx = CTransaction()
+        mnehf_tx.vin = []
+        mnehf_tx.vout = []
+        mnehf_tx.nVersion = 3
+        mnehf_tx.nType = 7 # mnehf signal
+        mnehf_tx.vExtraPayload = mnehf_payload.serialize()
+
+        mnehf_tx.calc_sha256()
+        msgHash = format(mnehf_tx.sha256, '064x')
+
+        self.log.info(f"Signing request_id: {request_id} msgHash: {msgHash}")
+        recsig = self.get_recovered_sig(request_id, msgHash)
+
+        mnehf_payload.quorumSig = bytearray.fromhex(recsig["sig"])
+        mnehf_tx.vExtraPayload = mnehf_payload.serialize()
+        return mnehf_tx
+
+
+    def set_sporks(self):
+        spork_enabled = 0
+        spork_disabled = 4070908800
+
+        self.nodes[0].sporkupdate("SPORK_17_QUORUM_DKG_ENABLED", spork_enabled)
+        self.nodes[0].sporkupdate("SPORK_19_CHAINLOCKS_ENABLED", spork_disabled)
+        self.nodes[0].sporkupdate("SPORK_3_INSTANTSEND_BLOCK_FILTERING", spork_disabled)
+        self.nodes[0].sporkupdate("SPORK_2_INSTANTSEND_ENABLED", spork_disabled)
+        self.wait_for_sporks_same()
+
+    def check_fork(self, expected):
+        status = get_bip9_details(self.nodes[0], 'testdummy')['status']
+        self.log.info(f"height: {self.nodes[0].getblockcount()} status: {status}")
+        assert_equal(status, expected)
+
+    def ensure_tx_is_not_mined(self, tx_id):
+        try:
+            self.nodes[0].gettransaction(tx_id)
+            raise AssertionError("Transaction should not be mined")
+        except JSONRPCException as e:
+            assert "Invalid or non-wallet transaction id" in e.error['message']
+
+    def send_tx(self, tx, expected_error = None, reason = None):
+        try:
+            self.log.info(f"Send tx with expected_error:'{expected_error}'...")
+            tx = self.nodes[0].sendrawtransaction(hexstring=tx.serialize().hex(), maxfeerate=0)
+            if expected_error is None:
+                return tx
+
+            # failure didn't happen, but expected:
+            message = "Transaction should not be accepted"
+            if reason is not None:
+                message += ": " + reason
+
+            raise AssertionError(message)
+        except JSONRPCException as e:
+            self.log.info(f"Send tx triggered an error: {e.error}")
+            assert expected_error in e.error['message']
+
+
+    def run_test(self):
+        node = self.nodes[0]
+
+        self.set_sporks()
+        self.activate_v19()
+        self.log.info(f"After v19 activation should be plenty of blocks: {node.getblockcount()}")
+        assert_greater_than(node.getblockcount(), 900)
+        assert_equal(get_bip9_details(node, 'testdummy')['status'], 'defined')
+
+        self.log.info("Mine a quorum...")
+        self.mine_quorum()
+        assert_equal(get_bip9_details(node, 'testdummy')['status'], 'defined')
+
+        key = ECKey()
+        key.generate()
+        pubkey = key.get_pubkey().get_bytes()
+        tx = self.create_mnehf(28, pubkey)
+
+        self.log.info("Checking deserialization of CMnEhf by python's code")
+        mnehf_payload = CMnEhf()
+        mnehf_payload.deserialize(BytesIO(tx.vExtraPayload))
+        assert_equal(mnehf_payload.version, 1)
+        assert_equal(mnehf_payload.versionBit, 28)
+        self.log.info("Checking correctness of requestId and quorumHash")
+        assert_equal(mnehf_payload.quorumHash, int(self.mninfo[0].node.quorum("selectquorum", 100, 'a0eee872d7d3170dd20d5c5e8380c92b3aa887da5f63d8033289fafa35a90691')["quorumHash"], 16))
+
+        self.send_tx(tx, expected_error='mnhf-before-v20')
+
+        assert_equal(get_bip9_details(node, 'testdummy')['status'], 'defined')
+        self.activate_v20()
+        assert_equal(get_bip9_details(node, 'testdummy')['status'], 'defined')
+
+        tx_sent = self.send_tx(tx)
+        node.generate(1)
+        self.sync_all()
+
+        self.log.info(f"Check MnEhfTx {tx_sent} was mined...")
+        block = node.getblock(node.getbestblockhash())
+        assert tx_sent in block['tx']
+
+        self.log.info(f"MnEhf tx: '{tx}' is sent: {tx_sent}")
+        self.log.info(f"mempool: {node.getmempoolinfo()}")
+        assert_equal(node.getmempoolinfo()['size'], 0)
+
+        while (node.getblockcount() + 1) % 12 != 0:
+            self.check_fork('defined')
+            node.generate(1)
+            self.sync_all()
+
+
+        self.restart_all_nodes()
+
+        for i in range(12):
+            self.check_fork('started')
+            node.generate(1)
+            self.sync_all()
+
+
+        for i in range(12):
+            self.check_fork('locked_in')
+            node.generate(1)
+            self.sync_all()
+            if i == 7:
+                self.restart_all_nodes()
+
+
+        self.check_fork('active')
+        self.restart_all_nodes()
+        self.check_fork('active')
+
+
+
+if __name__ == '__main__':
+    MnehfTest().main()
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
index 6e71acf51e..444ed6d8af 100755
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -124,6 +124,7 @@ BASE_SCRIPTS = [
     # vv Tests less than 60s vv
     'p2p_sendheaders.py', # NOTE: needs dash_hash to pass
     'p2p_sendheaders_compressed.py', # NOTE: needs dash_hash to pass
+    'feature_mnehf.py', # NOTE: needs dash_hash to pass
     'wallet_importmulti.py',
     'mempool_limit.py',
     'rpc_txoutproof.py',