diff --git a/wifi/1.3/default/tests/mock_wifi_legacy_hal.h b/wifi/1.3/default/tests/mock_wifi_legacy_hal.h
index 65fd115..53fa8d6 100644
--- a/wifi/1.3/default/tests/mock_wifi_legacy_hal.h
+++ b/wifi/1.3/default/tests/mock_wifi_legacy_hal.h
@@ -43,6 +43,12 @@
                  const std::string& iface_name));
     MOCK_METHOD1(getDriverVersion, std::pair<wifi_error, std::string>(
                  const std::string& iface_name));
+
+    MOCK_METHOD2(selectTxPowerScenario,
+                 wifi_error(const std::string& iface_name,
+                            wifi_power_scenario scenario));
+    MOCK_METHOD1(resetTxPowerScenario,
+                 wifi_error(const std::string& iface_name));
     MOCK_METHOD2(nanRegisterCallbackHandlers,
                  wifi_error(const std::string&, const NanCallbackHandlers&));
     MOCK_METHOD2(nanDisableRequest,
diff --git a/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp b/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp
index 7df9705..7928328 100644
--- a/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp
+++ b/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp
@@ -261,6 +261,17 @@
         return success;
     }
 
+    sp<WifiChip> chip_;
+    ChipId chip_id_ = kFakeChipId;
+    std::shared_ptr<NiceMock<legacy_hal::MockWifiLegacyHal>> legacy_hal_{
+        new NiceMock<legacy_hal::MockWifiLegacyHal>};
+    std::shared_ptr<NiceMock<mode_controller::MockWifiModeController>>
+        mode_controller_{new NiceMock<mode_controller::MockWifiModeController>};
+    std::shared_ptr<NiceMock<iface_util::MockWifiIfaceUtil>> iface_util_{
+        new NiceMock<iface_util::MockWifiIfaceUtil>};
+    std::shared_ptr<NiceMock<feature_flags::MockWifiFeatureFlags>>
+        feature_flags_{new NiceMock<feature_flags::MockWifiFeatureFlags>};
+
    public:
     void SetUp() override {
         chip_ = new WifiChip(chip_id_, legacy_hal_, mode_controller_,
@@ -278,18 +289,6 @@
         property_set("wifi.interface", "wlan0");
         property_set("wifi.concurrent.interface", "wlan1");
     }
-
-   private:
-    sp<WifiChip> chip_;
-    ChipId chip_id_ = kFakeChipId;
-    std::shared_ptr<NiceMock<legacy_hal::MockWifiLegacyHal>> legacy_hal_{
-        new NiceMock<legacy_hal::MockWifiLegacyHal>};
-    std::shared_ptr<NiceMock<mode_controller::MockWifiModeController>>
-        mode_controller_{new NiceMock<mode_controller::MockWifiModeController>};
-    std::shared_ptr<NiceMock<iface_util::MockWifiIfaceUtil>> iface_util_{
-        new NiceMock<iface_util::MockWifiIfaceUtil>};
-    std::shared_ptr<NiceMock<feature_flags::MockWifiFeatureFlags>>
-        feature_flags_{new NiceMock<feature_flags::MockWifiFeatureFlags>};
 };
 
 ////////// V1 Iface Combinations ////////////
@@ -452,18 +451,18 @@
     ASSERT_TRUE(createIface(IfaceType::NAN).empty());
 }
 
-TEST_F(WifiChipV1IfaceCombinationTest, RttControllerFlowStaModeNoSta) {
+TEST_F(WifiChipV1_AwareIfaceCombinationTest, RttControllerFlowStaModeNoSta) {
     findModeAndConfigureForIfaceType(IfaceType::STA);
     ASSERT_TRUE(createRttController());
 }
 
-TEST_F(WifiChipV1IfaceCombinationTest, RttControllerFlowStaModeWithSta) {
+TEST_F(WifiChipV1_AwareIfaceCombinationTest, RttControllerFlowStaModeWithSta) {
     findModeAndConfigureForIfaceType(IfaceType::STA);
     ASSERT_FALSE(createIface(IfaceType::STA).empty());
     ASSERT_TRUE(createRttController());
 }
 
-TEST_F(WifiChipV1IfaceCombinationTest, RttControllerFlowApToSta) {
+TEST_F(WifiChipV1_AwareIfaceCombinationTest, RttControllerFlowApToSta) {
     findModeAndConfigureForIfaceType(IfaceType::AP);
     const auto ap_iface_name = createIface(IfaceType::AP);
     ASSERT_FALSE(ap_iface_name.empty());
@@ -475,6 +474,30 @@
     ASSERT_TRUE(createRttController());
 }
 
+TEST_F(WifiChipV1_AwareIfaceCombinationTest, SelectTxScenarioWithOnlySta) {
+    findModeAndConfigureForIfaceType(IfaceType::STA);
+    ASSERT_EQ(createIface(IfaceType::STA), "wlan0");
+    EXPECT_CALL(*legacy_hal_, selectTxPowerScenario("wlan0", testing::_))
+        .WillOnce(testing::Return(legacy_hal::WIFI_SUCCESS));
+    chip_->selectTxPowerScenario_1_2(
+        V1_2::IWifiChip::TxPowerScenario::ON_HEAD_CELL_OFF,
+        [](const WifiStatus& status) {
+            ASSERT_EQ(WifiStatusCode::SUCCESS, status.code);
+        });
+}
+
+TEST_F(WifiChipV1_AwareIfaceCombinationTest, SelectTxScenarioWithOnlyAp) {
+    findModeAndConfigureForIfaceType(IfaceType::AP);
+    ASSERT_EQ(createIface(IfaceType::AP), "wlan0");
+    EXPECT_CALL(*legacy_hal_, selectTxPowerScenario("wlan0", testing::_))
+        .WillOnce(testing::Return(legacy_hal::WIFI_SUCCESS));
+    chip_->selectTxPowerScenario_1_2(
+        V1_2::IWifiChip::TxPowerScenario::ON_HEAD_CELL_OFF,
+        [](const WifiStatus& status) {
+            ASSERT_EQ(WifiStatusCode::SUCCESS, status.code);
+        });
+}
+
 ////////// V2 + Aware Iface Combinations ////////////
 // Mode 1 - STA + STA/AP
 //        - STA + P2P/NAN
@@ -653,6 +676,30 @@
     ASSERT_TRUE(createRttController());
 }
 
+TEST_F(WifiChipV2_AwareIfaceCombinationTest, SelectTxScenarioWithOnlySta) {
+    findModeAndConfigureForIfaceType(IfaceType::STA);
+    ASSERT_EQ(createIface(IfaceType::STA), "wlan0");
+    EXPECT_CALL(*legacy_hal_, selectTxPowerScenario("wlan0", testing::_))
+        .WillOnce(testing::Return(legacy_hal::WIFI_SUCCESS));
+    chip_->selectTxPowerScenario_1_2(
+        V1_2::IWifiChip::TxPowerScenario::ON_HEAD_CELL_OFF,
+        [](const WifiStatus& status) {
+            ASSERT_EQ(WifiStatusCode::SUCCESS, status.code);
+        });
+}
+
+TEST_F(WifiChipV2_AwareIfaceCombinationTest, SelectTxScenarioWithOnlyAp) {
+    findModeAndConfigureForIfaceType(IfaceType::AP);
+    ASSERT_EQ(createIface(IfaceType::AP), "wlan1");
+    EXPECT_CALL(*legacy_hal_, selectTxPowerScenario("wlan1", testing::_))
+        .WillOnce(testing::Return(legacy_hal::WIFI_SUCCESS));
+    chip_->selectTxPowerScenario_1_2(
+        V1_2::IWifiChip::TxPowerScenario::ON_HEAD_CELL_OFF,
+        [](const WifiStatus& status) {
+            ASSERT_EQ(WifiStatusCode::SUCCESS, status.code);
+        });
+}
+
 ////////// V1 Iface Combinations when AP creation is disabled //////////
 class WifiChipV1_AwareDisabledApIfaceCombinationTest : public WifiChipTest {
    public:
diff --git a/wifi/1.3/default/wifi_chip.cpp b/wifi/1.3/default/wifi_chip.cpp
index ce5df17..957b22b 100644
--- a/wifi/1.3/default/wifi_chip.cpp
+++ b/wifi/1.3/default/wifi_chip.cpp
@@ -641,7 +641,7 @@
     legacy_hal::wifi_error legacy_status;
     uint32_t legacy_feature_set;
     uint32_t legacy_logger_feature_set;
-    const auto ifname = getWlanIfaceName(0);
+    const auto ifname = getFirstActiveWlanIfaceName();
     std::tie(legacy_status, legacy_feature_set) =
         legacy_hal_.lock()->getSupportedFeatureSet(ifname);
     if (legacy_status != legacy_hal::WIFI_SUCCESS) {
@@ -709,7 +709,7 @@
     IWifiChip::ChipDebugInfo result;
     legacy_hal::wifi_error legacy_status;
     std::string driver_desc;
-    const auto ifname = getWlanIfaceName(0);
+    const auto ifname = getFirstActiveWlanIfaceName();
     std::tie(legacy_status, driver_desc) =
         legacy_hal_.lock()->getDriverVersion(ifname);
     if (legacy_status != legacy_hal::WIFI_SUCCESS) {
@@ -741,7 +741,8 @@
     legacy_hal::wifi_error legacy_status;
     std::vector<uint8_t> driver_dump;
     std::tie(legacy_status, driver_dump) =
-        legacy_hal_.lock()->requestDriverMemoryDump(getWlanIfaceName(0));
+        legacy_hal_.lock()->requestDriverMemoryDump(
+            getFirstActiveWlanIfaceName());
     if (legacy_status != legacy_hal::WIFI_SUCCESS) {
         LOG(ERROR) << "Failed to get driver debug dump: "
                    << legacyErrorToString(legacy_status);
@@ -756,7 +757,8 @@
     legacy_hal::wifi_error legacy_status;
     std::vector<uint8_t> firmware_dump;
     std::tie(legacy_status, firmware_dump) =
-        legacy_hal_.lock()->requestFirmwareMemoryDump(getWlanIfaceName(0));
+        legacy_hal_.lock()->requestFirmwareMemoryDump(
+            getFirstActiveWlanIfaceName());
     if (legacy_status != legacy_hal::WIFI_SUCCESS) {
         LOG(ERROR) << "Failed to get firmware debug dump: "
                    << legacyErrorToString(legacy_status);
@@ -817,7 +819,7 @@
         return {createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE), {}};
     }
     // These are still assumed to be based on wlan0.
-    std::string ifname = getWlanIfaceName(0);
+    std::string ifname = getFirstActiveWlanIfaceName();
     sp<WifiNanIface> iface = new WifiNanIface(ifname, legacy_hal_);
     nan_ifaces_.push_back(iface);
     for (const auto& callback : event_cb_handler_.getCallbacks()) {
@@ -959,8 +961,8 @@
                       "(and RTT by extension)";
         return {createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE), {}};
     }
-    sp<WifiRttController> rtt =
-        new WifiRttController(getWlanIfaceName(0), bound_iface, legacy_hal_);
+    sp<WifiRttController> rtt = new WifiRttController(
+        getFirstActiveWlanIfaceName(), bound_iface, legacy_hal_);
     rtt_controllers_.emplace_back(rtt);
     return {createWifiStatus(WifiStatusCode::SUCCESS), rtt};
 }
@@ -971,7 +973,7 @@
     std::vector<legacy_hal::wifi_ring_buffer_status>
         legacy_ring_buffer_status_vec;
     std::tie(legacy_status, legacy_ring_buffer_status_vec) =
-        legacy_hal_.lock()->getRingBuffersStatus(getWlanIfaceName(0));
+        legacy_hal_.lock()->getRingBuffersStatus(getFirstActiveWlanIfaceName());
     if (legacy_status != legacy_hal::WIFI_SUCCESS) {
         return {createWifiStatusFromLegacyError(legacy_status), {}};
     }
@@ -993,7 +995,7 @@
     }
     legacy_hal::wifi_error legacy_status =
         legacy_hal_.lock()->startRingBufferLogging(
-            getWlanIfaceName(0), ring_name,
+            getFirstActiveWlanIfaceName(), ring_name,
             static_cast<
                 std::underlying_type<WifiDebugRingBufferVerboseLevel>::type>(
                 verbose_level),
@@ -1010,7 +1012,8 @@
         return status;
     }
     legacy_hal::wifi_error legacy_status =
-        legacy_hal_.lock()->getRingBufferData(getWlanIfaceName(0), ring_name);
+        legacy_hal_.lock()->getRingBufferData(getFirstActiveWlanIfaceName(),
+                                              ring_name);
 
     return createWifiStatusFromLegacyError(legacy_status);
 }
@@ -1026,7 +1029,7 @@
 WifiStatus WifiChip::stopLoggingToDebugRingBufferInternal() {
     legacy_hal::wifi_error legacy_status =
         legacy_hal_.lock()->deregisterRingBufferCallbackHandler(
-            getWlanIfaceName(0));
+            getFirstActiveWlanIfaceName());
     return createWifiStatusFromLegacyError(legacy_status);
 }
 
@@ -1035,7 +1038,7 @@
     legacy_hal::wifi_error legacy_status;
     legacy_hal::WakeReasonStats legacy_stats;
     std::tie(legacy_status, legacy_stats) =
-        legacy_hal_.lock()->getWakeReasonStats(getWlanIfaceName(0));
+        legacy_hal_.lock()->getWakeReasonStats(getFirstActiveWlanIfaceName());
     if (legacy_status != legacy_hal::WIFI_SUCCESS) {
         return {createWifiStatusFromLegacyError(legacy_status), {}};
     }
@@ -1067,10 +1070,10 @@
             }
         };
         legacy_status = legacy_hal_.lock()->registerErrorAlertCallbackHandler(
-            getWlanIfaceName(0), on_alert_callback);
+            getFirstActiveWlanIfaceName(), on_alert_callback);
     } else {
         legacy_status = legacy_hal_.lock()->deregisterErrorAlertCallbackHandler(
-            getWlanIfaceName(0));
+            getFirstActiveWlanIfaceName());
     }
     return createWifiStatusFromLegacyError(legacy_status);
 }
@@ -1078,20 +1081,20 @@
 WifiStatus WifiChip::selectTxPowerScenarioInternal(
     V1_1::IWifiChip::TxPowerScenario scenario) {
     auto legacy_status = legacy_hal_.lock()->selectTxPowerScenario(
-        getWlanIfaceName(0),
+        getFirstActiveWlanIfaceName(),
         hidl_struct_util::convertHidlTxPowerScenarioToLegacy(scenario));
     return createWifiStatusFromLegacyError(legacy_status);
 }
 
 WifiStatus WifiChip::resetTxPowerScenarioInternal() {
     auto legacy_status =
-        legacy_hal_.lock()->resetTxPowerScenario(getWlanIfaceName(0));
+        legacy_hal_.lock()->resetTxPowerScenario(getFirstActiveWlanIfaceName());
     return createWifiStatusFromLegacyError(legacy_status);
 }
 
 WifiStatus WifiChip::setLatencyModeInternal(LatencyMode mode) {
     auto legacy_status = legacy_hal_.lock()->setLatencyMode(
-        getWlanIfaceName(0),
+        getFirstActiveWlanIfaceName(),
         hidl_struct_util::convertHidlLatencyModeToLegacy(mode));
     return createWifiStatusFromLegacyError(legacy_status);
 }
@@ -1107,7 +1110,7 @@
 WifiStatus WifiChip::selectTxPowerScenarioInternal_1_2(
     TxPowerScenario scenario) {
     auto legacy_status = legacy_hal_.lock()->selectTxPowerScenario(
-        getWlanIfaceName(0),
+        getFirstActiveWlanIfaceName(),
         hidl_struct_util::convertHidlTxPowerScenarioToLegacy_1_2(scenario));
     return createWifiStatusFromLegacyError(legacy_status);
 }
@@ -1197,7 +1200,7 @@
         };
     legacy_hal::wifi_error legacy_status =
         legacy_hal_.lock()->registerRingBufferCallbackHandler(
-            getWlanIfaceName(0), on_ring_buffer_data_callback);
+            getFirstActiveWlanIfaceName(), on_ring_buffer_data_callback);
 
     if (legacy_status == legacy_hal::WIFI_SUCCESS) {
         debug_ring_buffer_cb_registered_ = true;
@@ -1231,7 +1234,7 @@
         };
     legacy_hal::wifi_error legacy_status =
         legacy_hal_.lock()->registerRadioModeChangeCallbackHandler(
-            getWlanIfaceName(0), on_radio_mode_change_callback);
+            getFirstActiveWlanIfaceName(), on_radio_mode_change_callback);
     return createWifiStatusFromLegacyError(legacy_status);
 }
 
@@ -1415,6 +1418,18 @@
     return canCurrentModeSupportIfaceCombo(req_iface_combo);
 }
 
+std::string WifiChip::getFirstActiveWlanIfaceName() {
+    for (unsigned idx = 0; idx < kMaxWlanIfaces; idx++) {
+        const auto ifname = getWlanIfaceName(idx);
+        if (findUsingName(sta_ifaces_, ifname)) return ifname;
+        if (findUsingName(ap_ifaces_, ifname)) return ifname;
+    }
+    // This could happen if the chip call is made before any STA/AP
+    // iface is created. Default to wlan0 for such cases.
+    LOG(WARNING) << "No active wlan interfaces in use!";
+    return getWlanIfaceName(0);
+}
+
 // Return the first wlan (wlan0, wlan1 etc.) starting from |start_idx|
 // not already in use.
 // Note: This doesn't check the actual presence of these interfaces.
diff --git a/wifi/1.3/default/wifi_chip.h b/wifi/1.3/default/wifi_chip.h
index 27db9a4..3d12f4c 100644
--- a/wifi/1.3/default/wifi_chip.h
+++ b/wifi/1.3/default/wifi_chip.h
@@ -237,6 +237,7 @@
     bool canCurrentModeSupportIfaceOfType(IfaceType requested_type);
     bool isValidModeId(ChipModeId mode_id);
     bool isStaApConcurrencyAllowedInCurrentMode();
+    std::string getFirstActiveWlanIfaceName();
     std::string allocateApOrStaIfaceName(uint32_t start_idx);
     std::string allocateApIfaceName();
     std::string allocateStaIfaceName();
diff --git a/wifi/1.3/default/wifi_legacy_hal.h b/wifi/1.3/default/wifi_legacy_hal.h
index 4d6beb3..5df9487 100644
--- a/wifi/1.3/default/wifi_legacy_hal.h
+++ b/wifi/1.3/default/wifi_legacy_hal.h
@@ -254,9 +254,9 @@
                                           uint32_t cmd_id);
     wifi_error setScanningMacOui(const std::string& iface_name,
                                  const std::array<uint8_t, 3>& oui);
-    wifi_error selectTxPowerScenario(const std::string& iface_name,
-                                     wifi_power_scenario scenario);
-    wifi_error resetTxPowerScenario(const std::string& iface_name);
+    virtual wifi_error selectTxPowerScenario(const std::string& iface_name,
+                                             wifi_power_scenario scenario);
+    virtual wifi_error resetTxPowerScenario(const std::string& iface_name);
     wifi_error setLatencyMode(const std::string& iface_name,
                               wifi_latency_mode mode);
     // Logger/debug functions.