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A flashing check engine light is your Honda Odyssey’s way of saying “I have a serious problem, don’t ignore me”. Here are the common Honda Odyssey Check Engine Light Flashing Loose gas cap Oxygen sensor Catalytic Converter Spark Plugs Transmission Problems Fuel Pump These are the fault, errors arises when check engine light flashing. How to diagnose these fault? To diagnose these faults, a scanner or Obd2 device need to run on a vehicle, it pop up with the faults as code errors as start with P. How to repair these Code Errors? Common Fault Codes P0456 (Evaporative Emissions System - Small leak detected) The apparent loose fuel tank cap, this code can be caused by cracks in EVAP hoses or vapor canister. Purge valves or canister vent valve can be faulty, also. P0420 (Catalyst System Efficiency Below Threshold) This code in your Honda, it means that readings from your downstream O2 sensor show that amount of oxygen in the exhaust is incorrect. This can be caused by a faulty catalytic converter. Exhaust leaks or incorrect ignition timing can cause this code. It is wise to rule out all these possibilities before changing the catalytic converter, as they are very expensive. P0141 (Heated oxygen sensor 2, bank 1 heater control circuit malfunction) Downstream O2 sensor in your Honda have an integrated heating element to help it reach operating temperatures as soon as possible. P0740 (Transmission Lock-Up Control System Fault) This can be caused by something simple as low transmission fluid level or dirty transmission fluid. Other common transmission problems. P0401 (Exhaust Gas Recirculation Insufficient Flow) Insufficient flow through this system can be caused by blocked or cracked EGR tube or a faulty EGR valve. Another possibility is a vacuum related issue, as the EGR valve is vacuum operated. P1457 ( Evaporative Emissions Control System Leakage EVAP Canister System) Similar problem as it happened with P0401. Honda P0137 (Oxygen Sensor Circuit Low Voltage B1S2) It is best to test the O2 sensor resistance to confirm the oxygen sensor is the culprit. Other possible causes that can trigger P0137 include damaged wire harness to the O2 sensor, engine misfire, and fuel pressure too low. All Honda P CODE Errors List P1106 BARO Circuit Range/Performance Malfunction P1107 BARO Circuit Low Input P1108 BARO Circuit High Input P1121 Throttle Position Lower Than Expected P1122 Throttle Position Higher Than Expected P1128 MAP Lower Than Expected P1129 MAP Higher Than Expected P1162 HO2S11 Circuit Fault (Bank 1 Sensor 1) P1163 HO2S11 Slow Response (Bank 1 Sensor 1) P1164 HO2S11 Circuit Fault (Bank 1 Sensor 1) P1165 HO2S11 Slow Response(Bank 1 Sensor 1) P1166 HO2S11 Heater Circuit Fault (Bank 1 Sensor 1) P1167 HO2S11 Heater Circuit (VS+) Fault (Bank 1 Sensor 1) P1168 HO2S11 Label Circuit Low Voltage Fault (Bank 1 Sensor 1) P1169 HO2S11 Label Circuit High Voltage Fault (Bank 1 Sensor 1) P1201 Cylinder 1 Misfire P1202 Cylinder 2 Misfire P1203 Cylinder 3 Misfire P1204 Cylinder 4 Misfire P1205 Cylinder 5 Misfire P1206 Cylinder 6 Misfire P1241 Throttle Vent Control Motor Circuit 1 Malfunction P1242 Throttle Vent Control Motor Circuit 2 Malfunction P1243 Throttle Position Insufficient P1244 Closed Throttle Position Insufficient P1246 Accelerator Position Sensor 1 Circuit Malfunction P1247 Accelerator Position Sensor 2 Circuit Malfunction P1248 Accelerator Position Sensors 1 & 2 Improper Correlation P1253 VTEC System Circuit Fault P1259 VTEC System Malfunction, Rear Bank (Bank 1) P1279 VTEC System Malfunction, Front Bank (Bank 2) P1297 ELD Circuit Low Input P1298 Electrical Load Detector Circuit High Voltage P1300 Random Misfire P1301 Cylinder 1 Misfire P1302 Cylinder 2 Misfire P1303 Cylinder 3 Misfire P1304 Cylinder 4 Misfire P1305 Cylinder 5 Misfire P1306 Cylinder 6 Misfire P1316 Spark Plug Voltage Detection Circuit Malfunction, Front Bank P1317 Spark Plug Voltage Detection Circuit Malfunction, Rear Bank P1318 Spark Plug Voltage Detection Module Reset Circuit Malfunction, Front Bank P1319 Spark Plug Voltage Detection Module Reset Circuit Malfunction, Rear Bank P1324 Knock Sensor Power Source Circuit Low Voltage P1336 CKP Sensor B Range/Performance P1337 CKP Sensor B Low Input P1359 CKP/TDC Sensor Circuit Connector Disconnection P1361 TDC Sensor Intermittent Interruption P1362 TDC 1 Sensor No Signal P1366 TDC 2 Sensor Intermittent P1367 TDC 2 Sensor No Signal P1381 CYP Sensor A Intermittent Interruption P1382 CYP Sensor A No Signal P1386 CYP Sensor B Intermittent Interruption P1387 CYP Sensor B No Signal P1456 Evaporative Emission Control System Leak Detected (Fuel Tank System) P1457 Evaporative Emission Control System Leak Detected (Control Canister System) P1459 EVAP Purge Flow Switch Malfunction P1491 EGR Valve Lift Insufficient Detected P1498 EGR Valve Lift Sensor High Voltage P1508 IAC Valve Circuit Failure P1519 IAC Valve Circuit Failure P1607 ECM Internal Circuit Failure A P1608 ECM Internal Circuit Failure B P1655 TMA or TMB Signal Line Fault P1656 Automatic Transmission System Malfunction P1660 A/T FI Data Line Failure P1671 A/T FI Data Line No Signal P1672 A/T FI Data Line Failure P1676 Traction Control System FI Data Line No Signal P1677 Traction Control System FI Data Line Failure P1678 FPTDR Signal Line Failure P1681 A/T FI Signal A Low Input P1682 A/T FI Signal A High Input P1686 A/T FI Signal B Low Input P1687 A/T FI Signal B High Input P1690 Traction Control System STB Line Failure P1696 Traction Control Fuel Cut Signal Low Input P1697 Traction Control Fuel Cut Signal High Input P1705 TCM A/T Gear Position Switch Circuit Shorted P1706 TCM A/T Gear Position Switch Circuit Open P1753 TCM A/T