diff --git a/firmware/console/status_loop.cpp b/firmware/console/status_loop.cpp
index ac3050a250..0f84b429e3 100644
--- a/firmware/console/status_loop.cpp
+++ b/firmware/console/status_loop.cpp
@@ -512,11 +512,14 @@ void updateTunerStudioState(TunerStudioOutputChannels *tsOutputChannels DECLARE_
 	// offset 16
 	tsOutputChannels->massAirFlowVoltage = hasMafSensor() ? getMafVoltage(PASS_ENGINE_PARAMETER_SIGNATURE) : 0;
 
-	// offset 20
-	float lambdaValue = Sensor::get(SensorType::Lambda).value_or(0);
+	float lambdaValue = Sensor::get(SensorType::Lambda1).value_or(0);
 	tsOutputChannels->lambda = lambdaValue;
 	tsOutputChannels->airFuelRatio = lambdaValue * ENGINE(engineState.stoichiometricRatio);
 
+	float lambda2Value = Sensor::get(SensorType::Lambda2).value_or(0);
+	tsOutputChannels->lambda2 = lambda2Value;
+	tsOutputChannels->airFuelRatio2 = lambda2Value * ENGINE(engineState.stoichiometricRatio);
+
 	// offset 24
 	tsOutputChannels->engineLoad = getEngineLoadT(PASS_ENGINE_PARAMETER_SIGNATURE);
 
diff --git a/firmware/controllers/can/can_verbose.cpp b/firmware/controllers/can/can_verbose.cpp
index ac21d80b4b..5b9edafe8a 100644
--- a/firmware/controllers/can/can_verbose.cpp
+++ b/firmware/controllers/can/can_verbose.cpp
@@ -118,7 +118,7 @@ struct Sensors2 {
 };
 
 static void populateFrame(Sensors2& msg) {
-    msg.afr = Sensor::get(SensorType::Lambda).value_or(0) * 14.7f;
+    msg.afr = Sensor::get(SensorType::Lambda1).value_or(0) * 14.7f;
     msg.oilPressure = Sensor::get(SensorType::OilPressure).value_or(-1);
     msg.vvtPos = engine->triggerCentral.getVVTPosition();
     msg.vbatt = getVBatt();
diff --git a/firmware/controllers/can/obd2.cpp b/firmware/controllers/can/obd2.cpp
index 7a7d442a2a..9ee3789378 100644
--- a/firmware/controllers/can/obd2.cpp
+++ b/firmware/controllers/can/obd2.cpp
@@ -157,7 +157,7 @@ static void handleGetDataRequest(const CANRxFrame& rx) {
 		obdSendValue(_1_MODE, pid, 1, Sensor::get(SensorType::Tps1).value_or(0) * ODB_TPS_BYTE_PERCENT);	// (A*100/255)
 		break;
 	case PID_FUEL_AIR_RATIO_1: {
-		float lambda = Sensor::get(SensorType::Lambda).value_or(0);
+		float lambda = Sensor::get(SensorType::Lambda1).value_or(0);
 		// phi = 1 / lambda
 		float phi = clampF(0, 1 / lambda, 1.99f);
 
diff --git a/firmware/controllers/engine_controller.cpp b/firmware/controllers/engine_controller.cpp
index 92499a0557..630002edf4 100644
--- a/firmware/controllers/engine_controller.cpp
+++ b/firmware/controllers/engine_controller.cpp
@@ -710,7 +710,7 @@ void initEngineContoller(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX)
  * UNUSED_SIZE constants.
  */
 #ifndef RAM_UNUSED_SIZE
-#define RAM_UNUSED_SIZE 3400
+#define RAM_UNUSED_SIZE 3300
 #endif
 #ifndef CCM_UNUSED_SIZE
 #define CCM_UNUSED_SIZE 2800
diff --git a/firmware/controllers/gauges/lcd_controller.cpp b/firmware/controllers/gauges/lcd_controller.cpp
index 907dd51c5e..73bc72a9d3 100644
--- a/firmware/controllers/gauges/lcd_controller.cpp
+++ b/firmware/controllers/gauges/lcd_controller.cpp
@@ -220,8 +220,8 @@ static void showLine(lcd_line_e line, int /*screenY*/) {
 		return;
 #endif
 	case LL_AFR:
-		if (Sensor::hasSensor(SensorType::Lambda)) {
-			lcdPrintf("AFR: %.2f", Sensor::get(SensorType::Lambda).value_or(0));
+		if (Sensor::hasSensor(SensorType::Lambda1)) {
+			lcdPrintf("AFR: %.2f", Sensor::get(SensorType::Lambda1).value_or(0));
 		} else {
 			lcdPrintf("AFR: none");
 		}
diff --git a/firmware/controllers/math/closed_loop_fuel.cpp b/firmware/controllers/math/closed_loop_fuel.cpp
index 8349036ba4..a4edd81398 100644
--- a/firmware/controllers/math/closed_loop_fuel.cpp
+++ b/firmware/controllers/math/closed_loop_fuel.cpp
@@ -71,7 +71,7 @@ bool shouldUpdateCorrection(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
 
 	// Pause (but don't reset) correction if the AFR is off scale.
 	// It's probably a transient and poorly tuned transient correction
-	auto afr = Sensor::get(SensorType::Lambda).value_or(0) * 14.7f;
+	auto afr = Sensor::get(SensorType::Lambda1).value_or(0) * 14.7f;
 	if (!afr || afr < (cfg.minAfr * 0.1f) || afr > (cfg.maxAfr * 0.1f)) {
 		return false;
 	}
diff --git a/firmware/controllers/math/closed_loop_fuel_cell.cpp b/firmware/controllers/math/closed_loop_fuel_cell.cpp
index 3892c3145d..1c91bacd35 100644
--- a/firmware/controllers/math/closed_loop_fuel_cell.cpp
+++ b/firmware/controllers/math/closed_loop_fuel_cell.cpp
@@ -49,7 +49,7 @@ float ClosedLoopFuelCellBase::getAdjustment() const {
 }
 
 float ClosedLoopFuelCellImpl::getLambdaError(DECLARE_ENGINE_PARAMETER_SIGNATURE) const {
-	auto lambda = Sensor::get(SensorType::Lambda);
+	auto lambda = Sensor::get(SensorType::Lambda1);
 
 	// Failed sensor -> no error
 	if (!lambda) {
diff --git a/firmware/controllers/sensors/sensor.cpp b/firmware/controllers/sensors/sensor.cpp
index 7b873d2b0c..09093f1fde 100644
--- a/firmware/controllers/sensors/sensor.cpp
+++ b/firmware/controllers/sensors/sensor.cpp
@@ -34,7 +34,8 @@ static const char* s_sensorNames[] = {
 	"Aux Temp 1",
 	"Aux Temp 2",
 
-	"Lambda",
+	"Lambda 1",
+	"Lambda 2",
 
 	"Wastegate Position",
 	"Idle Valve Position",
diff --git a/firmware/controllers/sensors/sensor_type.h b/firmware/controllers/sensors/sensor_type.h
index 7676548f52..477d2d712a 100644
--- a/firmware/controllers/sensors/sensor_type.h
+++ b/firmware/controllers/sensors/sensor_type.h
@@ -52,7 +52,8 @@ enum class SensorType : unsigned char {
 	AuxTemp1,
 	AuxTemp2,
 
-	Lambda,
+	Lambda1,
+	Lambda2,
 
 	WastegatePosition,
 	IdlePosition,
diff --git a/firmware/init/sensor/init_lambda.cpp b/firmware/init/sensor/init_lambda.cpp
index e9b029fbc5..f1f22aa5fe 100644
--- a/firmware/init/sensor/init_lambda.cpp
+++ b/firmware/init/sensor/init_lambda.cpp
@@ -18,14 +18,15 @@ struct GetAfrWrapper {
 
 static GetAfrWrapper afrWrapper;
 
-static FunctionPointerSensor lambdaSensor(SensorType::Lambda,
+static FunctionPointerSensor lambdaSensor(SensorType::Lambda1,
 []() {
 	return afrWrapper.getLambda();
 });
 
 #if EFI_CAN_SUPPORT
 #include "AemXSeriesLambda.h"
-static AemXSeriesWideband aem(0, SensorType::Lambda);
+static AemXSeriesWideband aem1(0, SensorType::Lambda1);
+static AemXSeriesWideband aem2(1, SensorType::Lambda2);
 #endif
 
 void initLambda(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
@@ -33,7 +34,8 @@ void initLambda(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
 
 #if EFI_CAN_SUPPORT
 	if (CONFIG(enableAemXSeries)) {
-		registerCanSensor(aem);
+		registerCanSensor(aem1);
+		registerCanSensor(aem2);
 
 		return;
 	}
diff --git a/unit_tests/tests/sensor/test_sensor_init.cpp b/unit_tests/tests/sensor/test_sensor_init.cpp
index a66d88de64..fe37d36e28 100644
--- a/unit_tests/tests/sensor/test_sensor_init.cpp
+++ b/unit_tests/tests/sensor/test_sensor_init.cpp
@@ -215,6 +215,6 @@ TEST(SensorInit, Lambda) {
 
 	initLambda(PASS_ENGINE_PARAMETER_SIGNATURE);
 
-	auto s = Sensor::getSensorOfType(SensorType::Lambda);
+	auto s = Sensor::getSensorOfType(SensorType::Lambda1);
 	ASSERT_NE(nullptr, s);
 }
diff --git a/unit_tests/tests/test_stft.cpp b/unit_tests/tests/test_stft.cpp
index f9237fa0d1..55648f4682 100644
--- a/unit_tests/tests/test_stft.cpp
+++ b/unit_tests/tests/test_stft.cpp
@@ -87,12 +87,12 @@ TEST(ClosedLoopFuel, afrLimits) {
 	engineConfiguration->stft.minAfr = 100;  // 10.0 AFR
 	engineConfiguration->stft.maxAfr = 180;  // 18.0 AFR
 
-	Sensor::setMockValue(SensorType::Lambda, 0.1f);
+	Sensor::setMockValue(SensorType::Lambda1, 0.1f);
 	EXPECT_FALSE(shouldUpdateCorrection(PASS_ENGINE_PARAMETER_SIGNATURE));
 
-	Sensor::setMockValue(SensorType::Lambda, 1.0f);
+	Sensor::setMockValue(SensorType::Lambda1, 1.0f);
 	EXPECT_TRUE(shouldUpdateCorrection(PASS_ENGINE_PARAMETER_SIGNATURE));
 
-	Sensor::setMockValue(SensorType::Lambda, 2.0f);
+	Sensor::setMockValue(SensorType::Lambda1, 2.0f);
 	EXPECT_FALSE(shouldUpdateCorrection(PASS_ENGINE_PARAMETER_SIGNATURE));
 }