diff --git a/sketch/obd2_gauge/meter.h b/sketch/obd2_gauge/meter.h
index f97aa66..a172533 100644
--- a/sketch/obd2_gauge/meter.h
+++ b/sketch/obd2_gauge/meter.h
@@ -634,40 +634,87 @@ void initScreen() {
 /*-------------------------------*/
 
 // get A B from response return in global A B variable
-void getAB(String elm_rsp) {       // 41 05 2A 3C 01>
-  if (pidList[pidIndex] == "ATRV") {
+void getAB(String elm_rsp, String currentPid) { // 41 05 2A 3C 01>
+  A = 0;
+  B = 0;
+  if (currentPid == "ATRV") {
     return;
   }
-  if (elm_rsp.indexOf("NO DATA") != -1) { // pid no data
-    A = 0;
-    B = 0;
+  if (elm_rsp.indexOf("NO DATA") != -1 ||
+      elm_rsp.indexOf("UNABLE") != -1 ||
+      elm_rsp.indexOf("ERROR") != -1 ||
+      elm_rsp.indexOf("STOPPED") != -1) {
     return;
   }
-  // check if pid is 2 or 3 command length.
-  uint8_t charcnt = pidList[pidIndex].length() / 2; // 0105->2,221E1C->3
-  String strs[8];
-  uint8_t StringCount = 0;
-  while (elm_rsp.length() > 0) {      // keep reading each char
-    int index = elm_rsp.indexOf(' '); // check space
-    if (index == -1)                  // No space found
-    { // only data without space is now in strs {41,05,aa,bb}
-      strs[StringCount++] = elm_rsp;                   // last byte
-      if (StringCount > charcnt + 1) {
-        A = strtol(strs[charcnt].c_str(), NULL, 16);     // byte 3 save to A
-        B = strtol(strs[charcnt + 1].c_str(), NULL, 16); // byte 4 save to B
-      } else if (StringCount > charcnt) {
-        A = strtol(strs[charcnt].c_str(), NULL, 16);
-        B = 0;
-      }
-      break;
-    } else { // found space
-      strs[StringCount++] =
-          elm_rsp.substring(0, index); // copy strings from 0 to space to strs
-      elm_rsp = elm_rsp.substring(index +
-                                  1); // copy the rest behind space to elm_rsp
-      if (StringCount >= 7) break;
+
+  // Normalize: replace carriage returns, newlines, and prompt chars with spaces
+  elm_rsp.replace('\r', ' ');
+  elm_rsp.replace('\n', ' ');
+  elm_rsp.replace('>', ' ');
+
+  // Extract expected PID hex byte (e.g. "0105" -> "05", "010C" -> "0C", "010D" -> "0D")
+  String pidByte = (currentPid.length() >= 4) ? currentPid.substring(2) : currentPid;
+  pidByte.toUpperCase();
+
+  // 1. Tokenized search: look for "41" followed by PID byte
+  String tokens[16];
+  uint8_t tokenCount = 0;
+  int startIdx = 0;
+  while (startIdx < elm_rsp.length() && tokenCount < 16) {
+    while (startIdx < elm_rsp.length() && elm_rsp.charAt(startIdx) == ' ') {
+      startIdx++;
     }
-  } // while
+    if (startIdx >= elm_rsp.length()) break;
+    int endIdx = elm_rsp.indexOf(' ', startIdx);
+    if (endIdx == -1) endIdx = elm_rsp.length();
+    tokens[tokenCount++] = elm_rsp.substring(startIdx, endIdx);
+    startIdx = endIdx + 1;
+  }
+
+  for (uint8_t i = 0; i < tokenCount; i++) {
+    tokens[i].toUpperCase();
+  }
+
+  for (uint8_t i = 0; i + 1 < tokenCount; i++) {
+    if (tokens[i] == "41" && tokens[i + 1] == pidByte) {
+      if (i + 2 < tokenCount) {
+        A = strtol(tokens[i + 2].c_str(), NULL, 16);
+      }
+      if (i + 3 < tokenCount) {
+        B = strtol(tokens[i + 3].c_str(), NULL, 16);
+      }
+      return;
+    }
+  }
+
+  // 2. Compact string fallback (in case adapter sends responses without spaces, e.g. "410D32")
+  String compact = "";
+  for (int i = 0; i < elm_rsp.length(); i++) {
+    char c = elm_rsp.charAt(i);
+    if (c != ' ') compact += (char)toupper(c);
+  }
+  String targetPrefix = "41" + pidByte;
+  int fIdx = compact.indexOf(targetPrefix);
+  if (fIdx != -1) {
+    int dataIdx = fIdx + targetPrefix.length();
+    if (dataIdx + 2 <= compact.length()) {
+      A = strtol(compact.substring(dataIdx, dataIdx + 2).c_str(), NULL, 16);
+    }
+    if (dataIdx + 4 <= compact.length()) {
+      B = strtol(compact.substring(dataIdx + 2, dataIdx + 4).c_str(), NULL, 16);
+    }
+    return;
+  }
+
+  // 3. Positional fallback as in original author code
+  uint8_t charcnt = currentPid.length() / 2;
+  if (tokenCount > charcnt + 1) {
+    A = strtol(tokens[charcnt].c_str(), NULL, 16);
+    B = strtol(tokens[charcnt + 1].c_str(), NULL, 16);
+  } else if (tokenCount > charcnt) {
+    A = strtol(tokens[charcnt].c_str(), NULL, 16);
+    B = 0;
+  }
 } // getAB
 /*-------------------------------*/
 void updateMeter(uint8_t pidNo, String response) { // update parameter on screen
@@ -684,7 +731,7 @@ void updateMeter(uint8_t pidNo, String response) { // update parameter on screen
   bool digit = pidConfig[pidIdx][7].toInt();
   int warn = warningValue[pidIdx].toInt();
 
-  getAB(response);
+  getAB(response, pidList[pidNo]);
   float data = 0.0;
   switch (formula) {
   case 0:
@@ -705,12 +752,12 @@ void updateMeter(uint8_t pidNo, String response) { // update parameter on screen
   case 5:
     data = (256 * A + B) / 16.0;
     if (data > 150 || data < 0)
-      data = old_data[pidIndex];
+      data = old_data[pidNo];
     break;
   case 6:
     data = (A * 256 + B) * 5 / 72 - 18;
     if (data > 150 || data < 0)
-      data = old_data[pidIndex];
+      data = old_data[pidNo];
     break;
   case 7:
     data = A; // km/h (PID 010D Vehicle Speed)
diff --git a/sketch/obd2_gauge/obd2_gauge.ino b/sketch/obd2_gauge/obd2_gauge.ino
index 23b80c8..c710bac 100644
--- a/sketch/obd2_gauge/obd2_gauge.ino
+++ b/sketch/obd2_gauge/obd2_gauge.ino
@@ -327,29 +327,24 @@ recent_client_addr : {0x00,0x00,0x00,0x00,0x00,0x00} array of bytes[6]
   bt_message = "";
   for (uint8_t initIndex = 0; initIndex < elm327InitCount; initIndex++) {  //send init ELM327 AT command
     BTSerial.print(elm327Init[initIndex] + "\r");
-    uint32_t waitTimeout = (initIndex == elm327InitCount - 1) ? 5000 : 1500;
-    uint32_t startWait = millis();
-    while (millis() - startWait < waitTimeout) {
-      if (BTSerial.available() > 0) {
-        char incomingChar = BTSerial.read();
-        if (incomingChar == '>') {  //check prompt
-          BTSerial.flush();         //clear buffer
+    if (initIndex == elm327InitCount - 1) delay(2000);  //wait for 0100 Searching..protocal
+    else delay(100);                                    //must add delay , unless will skip BTSerial.avaialble>0
+    while (BTSerial.available() > 0) {
+      char incomingChar = BTSerial.read();
+      if (incomingChar == '>') {  //check prompt
+        BTSerial.flush();         //clear buffer
 #ifdef SERIAL_DEBUG
-          Serial.println(bt_message);
+        Serial.println(bt_message);
 #endif
 #ifdef TERMINAL
-          Terminal(bt_message, 0, 48, 320, 191);
+        Terminal(bt_message, 0, 48, 320, 191);
 #endif
-          if (initIndex == 1) BTSerial.print("\r");  //ATBRD23 response
-          bt_message = "";
-          break;
-        } else {
-          bt_message.concat(incomingChar);  //keep elm327 respond
-        }
+        if (initIndex == 1) BTSerial.print("\r");  //ATBRD23 response
+        bt_message = "";
       } else {
-        delay(10);
+        bt_message.concat(incomingChar);  //keep elm327 respond
       }
-    }  //while waitTimeout
+    }  //while
   }    //for
 
   initScreen();
@@ -461,8 +456,8 @@ void loop() {
      //----------------------
      //BLUETOOTH read
   static uint32_t lastPidSendTime = 0;
-  // Watchdog: If waiting for prompt for more than 1500ms, recover!
-  if (!prompt && (millis() - lastPidSendTime > 1500)) {
+  // Watchdog: If waiting for prompt for more than 6000ms (standard OBD2 maximum ECU timeout), recover!
+  if (!prompt && (millis() - lastPidSendTime > 6000)) {
 #ifdef SERIAL_DEBUG
     Serial.printf("PID timeout for %s, recovering...\n", pidList[pidIndex].c_str());
 #endif
@@ -480,7 +475,7 @@ void loop() {
       Serial.println(bt_message);
 #endif
 #ifdef TERMINAL  //for degbugging
-      getAB(bt_message);
+      getAB(bt_message, pidList[pidIndex]);
       Terminal(bt_message + "->" + String(A) + "," + String(B), 0, 48, 320, 191);
 #endif
       prompt = true;  //pid response ready to calculate & display