diff --git a/firmware/controllers/algo/obd_error_codes.h b/firmware/controllers/algo/obd_error_codes.h
index 08fadf0b05..addc9ecb06 100644
--- a/firmware/controllers/algo/obd_error_codes.h
+++ b/firmware/controllers/algo/obd_error_codes.h
@@ -307,7 +307,9 @@ enum class ObdCode : uint16_t {
 	//P0259 Injection Pump Fuel Metering Control "B" High (Cam/R
 	//P0260 Injection Pump Fuel Metering Control "B" Intermittent Injector)
 	//P0261 Cylinder I Injector Circuit Low
+	OBD_Injector_Circuit_1_Low = 261,
 	//P0262 Cylinder I Injector Circuit High
+	OBD_Injector_Circuit_1_High = 262,
 	//P0263 Cylinder I Contribution/Balance Fault
 	//P0264 Cylinder 2 Injector Circuit Low
 	//P0265 Cylinder 2 Injector Circuit High
diff --git a/firmware/controllers/sensors/sensor_checker.cpp b/firmware/controllers/sensors/sensor_checker.cpp
index 257d029ac5..e14d15b8bd 100644
--- a/firmware/controllers/sensors/sensor_checker.cpp
+++ b/firmware/controllers/sensors/sensor_checker.cpp
@@ -128,9 +128,13 @@ static ObdCode getCodeForInjector(int idx, brain_pin_diag_e diag) {
 		return ObdCode::None;
 	}
 
-	// TODO: do something more intelligent with `diag`?
-	UNUSED(diag);
+	if ((diag & PIN_OPEN) || (diag & PIN_SHORT_TO_GND)) {
+		return (ObdCode)((int)ObdCode::OBD_Injector_Circuit_1_Low + (idx * 3));
+	} else if ((diag & PIN_SHORT_TO_BAT) || (diag & PIN_OVERLOAD)) {
+		return (ObdCode)((int)ObdCode::OBD_Injector_Circuit_1_High + (idx * 3));
+	}
 
+	/* else common error code */
 	return (ObdCode)((int)ObdCode::OBD_Injector_Circuit_1 + idx);
 }
 #endif // EFI_ENGINE_CONTROL