Emissions Codes
704 OBD-II diagnostic trouble codes in this category.
Showing page 3 of 8 (704 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P0546 | Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1 | Exhaust Temp | Medium |
| P0547 | Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1 | Exhaust Temp | Medium |
| P0548 | Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1 | Exhaust Temp | Medium |
| P0549 | Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1 | Exhaust Temp | Medium |
| P055E | Oxygen Sensor Control Module System Voltage | Oxygen Sensor | Medium |
| P064D | Internal Control Module O2 Sensor Processor Performance Bank 1 | Oxygen Sensor | Medium |
| P064E | Internal Control Module O2 Sensor Processor Performance Bank 2 | Oxygen Sensor | Medium |
| P08E7 | Drive Motor A Clutch Enable Circuit | Hybrid/EV System | High |
| P08E8 | Drive Motor A Clutch Enable Circuit Low | Hybrid/EV System | High |
| P08E9 | Drive Motor A Clutch Enable Circuit High | Hybrid/EV System | High |
| P1090 | Pre-Catalyst Fuel Trim Too Lean Bank 1 (Bmw) | Emissions Control | Medium |
| P1091 | Pre-Catalyst Fuel Trim Too Rich Bank 1 (Bmw) | Emissions Control | Medium |
| P1092 | Pre-Catalyst Fuel Trim Too Lean Bank 2 (Bmw) | Emissions Control | Medium |
| P1093 | Pre-Catalyst Fuel Trim Too Rich Bank 2 (Bmw) | Emissions Control | Medium |
| P1190 | Pre-Catalyst Fuel Trim System Bank 1 (Bmw) | Emissions Control | Medium |
| P1191 | Pre-Catalyst Fuel Trim System Bank 2 (Bmw) | Emissions Control | Medium |
| P1192 | Post-Catalyst Fuel Trim System Bank 1 (Bmw) | Emissions Control | Medium |
| P1193 | Post-Catalyst Fuel Trim System Bank 2 (Bmw) | Emissions Control | Medium |
| P1195 | O2 Sensor 1/1 Bank 1 Sensor 1 Slow During Catalyst Monitor (Dodge) | Emissions Control | Medium |
| P1196 | O2 Sensor 2/1 Bank 2 Sensor 1 Slow During Catalyst Monitor (Dodge) | Emissions Control | Medium |
| P1197 | O2 Sensor 1/2 Bank 1 Sensor 2 Slow During Catalyst Monitor (Dodge) | Emissions Control | Medium |
| P1250 | Early Fuel Evaporation Heater Circuit (Buick) | Emissions Control | Medium |
| P1400 | Heated Catalyst Battery Voltage or Current Too Low During Heating Bank 1 (Bmw) | Emissions Control | Medium |
| P1401 | DPFE Circuit High Input | Diesel Emissions | High |
| P1402 | Heated Catalyst Power Switch Overtemperature Condition Bank 1 (Bmw) | Emissions Control | Medium |
| P1404 | IAT - B Circuit Malfunction/ Exhaust Gas Recirculation Closed Position Performance | Emission Control | Medium |
| P1405 | Heated Catalyst Power Switch Overtemperature Condition Bank 2 (Bmw) | Emissions Control | Medium |
| P1406 | Heated Catalyst Internal Control Module Checksum ROM Error (Bmw) | Emissions Control | Medium |
| P1407 | EGR Air Intrusion In Exhaust Supply To EGR Valve (Buick) | Emissions Control | Medium |
| P1409 | EGR Vacuum System Leak (Buick) | Emissions Control | Medium |
| P1412 | EGR Differential Pressure Sensor Signal Low (Kia) | Emissions Control | Medium |
| P1425 | EVAP Purge Control Solenoid Circuit Low Voltage (Kia) | Emissions Control | Medium |
| P1436 | A/C Evaporator Air Temperature Circuit Low | Emissions Control | Medium |
| P1437 | A/C Evaporator Air Temperature Circuit High | Emissions Control | Medium |
| P1443 | Evaporative Emission Control System Control Valve | Emission Control | Medium |
| P1455 | Substantial Leak or Blockage in Evaporative Emission Control System (Ford) | Emissions Control | Medium |
| P1459 | EVAP Purge Flow Switch Malfunction (Acura) | Emissions Control | Medium |
| P1460 | Heated Catalyst Heater Power Switch Temperature Sensor Electrical Bank 2 (Bmw) | Emissions Control | Medium |
| P1461 | Heated Catalyst Gate Voltage Signal Low (Bmw) | Emissions Control | Medium |
| P1462 | Heated Catalyst Internal Control Module Checksum ROM Error (Bmw) | Emissions Control | Medium |
| P1463 | Heated Catalyst Battery Temperature Sensor 1 Electrical (Bmw) | Emissions Control | Medium |
| P1464 | Heated Catalyst Battery Temperature Sensor 2 Electrical (Bmw) | Emissions Control | Medium |
| P1465 | Heated Catalyst Battery Temperature Sensor 1 or 2 Plausibility (Bmw) | Emissions Control | Medium |
| P1466 | Heated Catalyst Power Switch Temperature Sensor Plausibility (Bmw) | Emissions Control | Medium |
| P1467 | Heated Catalyst Comparison Battery Voltages of Power Switches Plausibility (Bmw) | Emissions Control | Medium |
| P1468 | Heated Catalyst Battery Disconnecting Switch Plausibility (Bmw) | Emissions Control | Medium |
| P1482 | Catalyst Temperature Sensor Circuit Shorted Low (Dodge) | Emissions Control | High |
| P1484 | Catalytic Converter Overheat Detected (Dodge) | Emissions Control | Medium |
| P1486 | Evap Leak Monitor Pinched Hose (Dodge) | Emissions Control | Medium |
| P1497 | EGR Stepper Motor Malfunction Circuit 2 1.8L (Kia) | Emissions Control | Medium |
| P1498 | EGR Valve Lift Sensor High Voltage (Acura) | Emissions Control | Medium |
| P1547 | A/C System Performance Degraded (Buick) | Emissions Control | Medium |
| P1645 | EVAP Solenoid Output Circuit (Buick) | Emissions Control | Medium |
| P1675 | EVAP Vent Solenoid Control Circuit (Buick) | Emissions Control | Medium |
| P2000 | NOx Trap Efficiency Below Threshold Bank 1 | NOx Trap | High |
| P2001 | NOx Trap Efficiency Below Threshold Bank 2 | NOx Trap | High |
| P2002 | Diesel Particulate Filter Efficiency Below Threshold | DPF | High |
| P2003 | Diesel Particulate Filter Efficiency Below Threshold Bank 2 | DPF | High |
| P2024 | EVAP Fuel Vapor Temperature Sensor Circuit | Emission Control | Medium |
| P2025 | EVAP Fuel Vapor Temperature Sensor Performance | Emission Control | Medium |
| P2026 | EVAP Fuel Vapor Temperature Sensor Circuit Low Voltage | Emission Control | Medium |
| P2027 | EVAP Fuel Vapor Temperature Sensor Circuit High Voltage | Emission Control | Medium |
| P2028 | EVAP Fuel Vapor Temperature Sensor Circuit Intermittent | Emission Control | Medium |
| P2029 | Fuel Fired Heater Disabled | Emission Control | Medium |
| P2030 | Fuel Fired Heater Performance | Emission Control | Medium |
| P2031 | Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 | Emission Control | Medium |
| P2032 | Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 2 | Emission Control | Medium |
| P2033 | Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 2 | Emission Control | Medium |
| P2034 | Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2 | Emission Control | Medium |
| P2035 | Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 2 | Emission Control | Medium |
| P2036 | Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 2 | Emission Control | Medium |
| P2037 | Reductant Injection Air Pressure Sensor A Circuit | Emission Control | Medium |
| P2038 | Reductant Injection Air Pressure Sensor A Circuit Range/Performance | Emission Control | Medium |
| P2039 | Reductant Injection Air Pressure Sensor A Circuit Low | Emission Control | Medium |
| P2040 | Reductant Injection Air Pressure Sensor A Circuit High | Emission Control | Medium |
| P2041 | Reductant Injection Air Pressure Sensor A Circuit Intermittent | Emission Control | Medium |
| P2042 | Reductant Temperature Sensor A Circuit | Emission Control | Medium |
| P2043 | Reductant Temperature Sensor A Circuit Range/Performance | Emission Control | Medium |
| P2044 | Reductant Temperature Sensor A Circuit Low | Emission Control | Medium |
| P2045 | Reductant Temperature Sensor A Circuit High | Emission Control | Medium |
| P2046 | Reductant Temperature Sensor A Circuit Intermittent | Emission Control | Medium |
| P2047 | Reductant Injection Valve Circuit/Open Bank 1 Unit 1 | Emission Control | Medium |
| P2048 | Reductant Injection Valve Circuit Low Bank 1 Unit 1 | Emission Control | Medium |
| P2049 | Reductant Injection Valve Circuit High Bank 1 Unit 1 | Emission Control | Medium |
| P2050 | Reductant Injection Valve Circuit/Open Bank 2 Unit 1 | Emission Control | Medium |
| P2051 | Reductant Injection Valve Circuit Low Bank 2 Unit 1 | Emission Control | Medium |
| P2052 | Reductant Injection Valve Circuit High Bank 2 Unit 1 | Emission Control | Medium |
| P2053 | Reductant Injection Valve Circuit/Open Bank 1 Unit 2 | Emission Control | Medium |
| P2054 | Reductant Injection Valve Circuit Low Bank 1 Unit 2 | Emission Control | Medium |
| P2055 | Reductant Injection Valve Circuit High Bank 1 Unit 2 | Emission Control | Medium |
| P2056 | Reductant Injection Valve Circuit/Open Bank 2 Unit 2 | Emission Control | Medium |
| P2057 | Reductant Injection Valve Circuit Low Bank 2 Unit 2 | Emission Control | Medium |
| P2058 | Reductant Injection Valve Circuit High Bank 2 Unit 2 | Emission Control | Medium |
| P2059 | Reductant Injection Air Pump Control Circuit/Open | Emission Control | Medium |
| P2060 | Reductant Injection Air Pump Control Circuit Low | Emission Control | Medium |
| P2061 | Reductant Injection Air Pump Control Circuit High | Emission Control | Medium |
| P2062 | Reductant/Regeneration Supply Control Circuit/Open | Emission Control | Medium |
| P2063 | Reductant/Regeneration Supply Control Circuit Low | Emission Control | Medium |
| P2064 | Reductant/Regeneration Supply Control Circuit High | Emission Control | Medium |
| P2072 | Throttle Actuator Control System - Ice Blockage Bank 1 | Emission Control | Medium |
About Emissions Codes
This page lists all 704 OBD-II diagnostic trouble codes classified under the Emissions category. These codes are stored by your vehicle's onboard computer when a sensor detects a malfunction in the emissions system. Each code begins with a letter indicating the system (P for Powertrain, B for Body, C for Chassis, U for Network) followed by four digits that identify the specific fault.
When your check engine light comes on, an OBD-II scanner reads these stored codes to help pinpoint the problem. Generic codes (where the second digit is 0) follow the SAE J2012 standard and mean the same thing on every vehicle. Manufacturer-specific codes (where the second digit is 1) may have different meanings depending on the vehicle brand.
Click any code in the table above to see its full description, possible causes, common symptoms, and step-by-step repair guidance. Use the search box to quickly find a specific code within this category.