Emissions Codes
704 OBD-II diagnostic trouble codes in this category.
Showing page 4 of 8 (704 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P2073 | Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Idle | Emission Control | Medium |
| P2074 | Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Higher Load | Emission Control | Medium |
| P2080 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1 | Emission Control | Medium |
| P2081 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 1 | Emission Control | Medium |
| P2082 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1 | Emission Control | Medium |
| P2083 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 1 | Emission Control | Medium |
| P2084 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2 | Emission Control | Medium |
| P2085 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2 | Emission Control | Medium |
| P2086 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2 | Emission Control | Medium |
| P2087 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 2 | Emission Control | Medium |
| P2088 | A Camshaft Position Actuator Control Circuit Low Bank 1 | Emission Control | Medium |
| P2089 | A Camshaft Position Actuator Control Circuit High Bank 1 | Emission Control | Medium |
| P2090 | B Camshaft Position Actuator Control Circuit Low Bank 1 | Emission Control | Medium |
| P2091 | B Camshaft Position Actuator Control Circuit High Bank 1 | Emission Control | Medium |
| P2092 | A Camshaft Position Actuator Control Circuit Low Bank 2 | Emission Control | Medium |
| P2093 | A Camshaft Position Actuator Control Circuit High Bank 2 | Emission Control | Medium |
| P2094 | B Camshaft Position Actuator Control Circuit Low Bank 2 | Emission Control | Medium |
| P2095 | B Camshaft Position Actuator Control Circuit High Bank 2 | Emission Control | Medium |
| P2096 | Post Catalyst Fuel Trim Too Lean (Bank 1) | Catalytic Converter | Medium |
| P2097 | Post Catalyst Fuel Trim Too Rich (Bank 1) | Catalytic Converter | Medium |
| P2098 | Post Catalyst Fuel Trim System Too Lean Bank 2 | Catalyst System | Medium |
| P2099 | Post Catalyst Fuel Trim System Too Rich Bank 2 | Catalyst System | Medium |
| P20E2 | Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1 | Emission Control | Medium |
| P20E3 | Exhaust Gas Temperature Sensor 1/3 Correlation Bank 1 | Emission Control | Medium |
| P20E4 | Exhaust Gas Temperature Sensor 2/3 Correlation Bank 1 | Emission Control | Medium |
| P20E5 | Exhaust Gas Temperature Sensor 1/2 Correlation Bank 2 | Emission Control | Medium |
| P20E6 | Reductant Injection Air Pressure Too Low | Diesel Emissions | High |
| P20E7 | Reductant Injection Air Pressure Too High | Diesel Emissions | High |
| P20E8 | Reductant Pressure Too Low | Diesel Emissions | High |
| P20E9 | Reductant Pressure Too High | Diesel Emissions | High |
| P2195 | O2 Sensor Signal Stuck Lean (Bank 1 Sensor 1) | Oxygen Sensor | Medium |
| P2196 | O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1) | Oxygen Sensor | Medium |
| P2197 | O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2198 | O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2200 | NOx Sensor Circuit Bank 1 | NOx Sensor | High |
| P2201 | NOx Sensor Circuit Range/Performance Bank 1 | NOx Sensor | Medium |
| P2202 | NOx Sensor Circuit Low Input Bank 1 | NOx Sensor | Medium |
| P2203 | NOx Sensor Circuit High Input Bank 1 | NOx Sensor | Medium |
| P2204 | NOx Sensor Circuit Intermittent Bank 1 | NOx Sensor | Medium |
| P2205 | NOx Sensor Heater Control Circuit/Open Bank 1 | NOx Sensor | Medium |
| P2206 | NOx Sensor Heater Control Circuit Low Bank 1 Sensor 1 | NOx Sensor | High |
| P2207 | NOx Sensor Heater Control Circuit High Bank 1 Sensor 1 | NOx Sensor | High |
| P2208 | NOx Sensor Heater Sense Circuit Bank 1 Sensor 1 | NOx Sensor | High |
| P2209 | NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1 | NOx Sensor | High |
| P2210 | NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 1 | NOx Sensor | High |
| P2211 | NOx Sensor Heater Sense Circuit High Bank 1 Sensor 1 | NOx Sensor | High |
| P2212 | NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 1 | NOx Sensor | High |
| P2213 | NOx Sensor Circuit Bank 2 | NOx Sensor | High |
| P2214 | NOx Sensor Circuit Range/Performance Bank 2 | NOx Sensor | High |
| P2215 | NOx Sensor Circuit Low Bank 2 | NOx Sensor | High |
| P2216 | NOx Sensor Circuit High Bank 2 | NOx Sensor | High |
| P2217 | NOx Sensor Circuit Intermittent Bank 2 | NOx Sensor | High |
| P2218 | NOx Sensor Heater Control Circuit/Open Bank 2 | NOx Sensor | High |
| P2219 | NOx Sensor Heater Control Circuit Low Bank 2 | NOx Sensor | High |
| P2220 | NOx Sensor Heater Control Circuit High Bank 2 | NOx Sensor | High |
| P2221 | NOx Sensor Heater Sense Circuit Bank 2 | NOx Sensor | High |
| P2222 | NOx Sensor Heater Sense Circuit Range/Performance Bank 2 | NOx Sensor | High |
| P2223 | NOx Sensor Heater Sense Circuit Low Bank 2 | NOx Sensor | High |
| P2224 | NOx Sensor Heater Sense Circuit High Bank 2 | NOx Sensor | High |
| P2225 | NOx Sensor Heater Sense Circuit Intermittent Bank 2 | NOx Sensor | High |
| P2226 | Barometric Pressure Sensor A Circuit | Emission Control | Medium |
| P2227 | Barometric Pressure Sensor A Circuit Range/Performance | Emission Control | Medium |
| P2228 | Barometric Pressure Sensor A Circuit Low | Emission Control | Medium |
| P2230 | Barometric Pressure Sensor A Circuit Intermittent/Erratic | Emission Control | Medium |
| P2231 | O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2232 | O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 1 Sensor 2 | Oxygen Sensor | Medium |
| P2233 | O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2234 | O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2235 | O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 2 | Oxygen Sensor | Medium |
| P2236 | O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 3 | Oxygen Sensor | Medium |
| P2237 | O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1 | Wideband O2 | Medium |
| P2238 | O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2239 | O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2240 | O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1 | Wideband O2 | Medium |
| P2241 | O2 Sensor Positive Current Control Circuit Low Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2242 | O2 Sensor Positive Current Control Circuit High Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2243 | O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2244 | O2 Sensor Reference Voltage Performance Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2245 | O2 Sensor Reference Voltage Circuit Low Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2246 | O2 Sensor Reference Voltage Circuit High Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2247 | O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2248 | O2 Sensor Reference Voltage Performance Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2249 | O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2250 | O2 Sensor Reference Voltage Circuit High Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2251 | O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1 | Wideband O2 | Medium |
| P2252 | O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2253 | O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2254 | O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1 | Wideband O2 | Medium |
| P2255 | O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2256 | O2 Sensor Negative Current Control Circuit High Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2257 | AIR System Control A Circuit Low | Emission Control | Medium |
| P2258 | AIR System Control A Circuit High | Emission Control | Medium |
| P2259 | AIR System Control B Circuit Low | Emission Control | Medium |
| P2260 | AIR System Control B Circuit High | Emission Control | Medium |
| P2264 | Water in Fuel Sensor A Circuit | Emission Control | Medium |
| P2265 | Water in Fuel Sensor A Circuit Range/Performance | Emission Control | Medium |
| P2266 | Water in Fuel Sensor A Circuit Low | Emission Control | Medium |
| P2267 | Water in Fuel Sensor A Circuit High | Emission Control | Medium |
| P2268 | Water in Fuel Sensor A Circuit Intermittent | Emission Control | Medium |
| P2270 | O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 | Oxygen Sensor | 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.