Air Intake and Metering
Everything between the outside air and the inlet valve: filtration, ducting, the throttle, and the sensors that measure how much air is actually getting in. Almost every fuelling calculation starts from a measurement made here, which is why faults in this system produce symptoms that look like they belong somewhere else.
407 codes · 18 components · 7 live parameters
Components
- Intake Air Temperature Sensor 83
- Throttle Body 69
- Throttle Position Sensor 58
- Intake Manifold Tuning Valve 56
- Mass Air Flow Sensor 52
- Intake Manifold 51
- EGR Throttle Valve 38
- Throttle Actuator Motor 34
- PCV Valve 31
- Air Filter 30
- Manifold Absolute Pressure Sensor 29
- Crankcase Pressure Sensor 14
- Crankcase Breather Hose 13
- Intake Air Heater 11
- Idle Air Control Valve 9
- Intake Air Oxygen Sensor 7
- Humidity Sensor 5
- Air Cleaner Inlet Actuator 3
Live parameters to watch
| PID | Parameter | Unit | Conversion |
|---|---|---|---|
| 01:0B | Intake manifold absolute pressure Absolute manifold pressure — high at idle means poor vacuum, which points at a large leak, a restricted exhaust or worn valve timing. With the engine off it should read local atmospheric pressure, which is a free sanity check on the sensor. | kPa | A |
| 01:0F | Intake air temperature Temperature of air entering the engine. On a forced-induction vehicle, watch this rise under sustained load: a large climb indicates the intercooler is not doing its job, which costs power and raises detonation risk. | °C | A − 40 |
| 01:10 | Mass air flow rate Measured air mass entering the engine. A rough field check: at wide-open throttle a healthy naturally aspirated engine flows roughly its displacement in litres times its speed in thousands of rpm, in grams per second. Well below that suggests a restriction or a lazy sensor. | g/s | ((256 × A) + B) / 100 |
| 01:11 | Throttle position Throttle plate position. Sweep the pedal slowly and watch for a flat step in an otherwise smooth rise — that dead spot is a worn sensor track, and it is invisible to any static measurement. | % | A × 100 / 255 |
| 01:45 | Relative throttle position Throttle position relative to its learned closed position. Diverging from absolute throttle position indicates the learned closed point has drifted — common after cleaning a throttle body without performing the relearn. | % | A × 100 / 255 |
| 01:47 | Absolute throttle position B The second throttle position sensor. Its whole purpose is cross-checking the first, so watching both through a pedal sweep is how the P0220-series correlation faults are actually found. | % | A × 100 / 255 |
| 01:4C | Commanded throttle actuator What the module is telling the throttle to do. Commanded opening with no matching actual opening means the plate is binding or the actuator has failed — a distinction no code makes for you. | % | A × 100 / 255 |
Trouble codes
Critical
2
High
72
- P0068 Manifold Absolute Pressure/Mass Air Flow — Throttle Position Correlation Stop driving
- P0100 Mass or Volume Air Flow Sensor A Circuit
- P0101 Mass or Volume Air Flow Sensor A Circuit Range/Performance
- P0102 Mass or Volume Air Flow Sensor A Circuit Low
- P0103 Mass or Volume Air Flow Sensor A Circuit High
- P0105 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit
- P0106 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Range/Performance
- P0107 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low
- P0108 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High
- P0120 Throttle/Pedal Position Sensor/Switch A Circuit Stop driving
- P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Stop driving
- P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Stop driving
- P0123 Throttle/Pedal Position Sensor/Switch A Circuit High Stop driving
- P0124 Throttle/Pedal Position Sensor/Switch A Circuit Intermittent Stop driving
- P0170 Fuel Trim Malfunction — Bank 1
- P0171 System Too Lean — Bank 1
- P0172 System Too Rich — Bank 1
- P0173 Fuel Trim Malfunction — Bank 2
- P0174 System Too Lean — Bank 2
- P0175 System Too Rich — Bank 2
- P0220 Throttle/Pedal Position Sensor/Switch B Circuit Stop driving
- P0221 Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance Stop driving
- P0222 Throttle/Pedal Position Sensor/Switch B Circuit Low Stop driving
- P0223 Throttle/Pedal Position Sensor/Switch B Circuit High Stop driving
- P0224 Throttle/Pedal Position Sensor/Switch B Circuit Intermittent Stop driving
- P0225 Throttle/Pedal Position Sensor/Switch C Circuit Stop driving
- P0226 Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Stop driving
- P0227 Throttle/Pedal Position Sensor/Switch C Circuit Low Stop driving
- P0228 Throttle/Pedal Position Sensor/Switch C Circuit High Stop driving
- P0229 Throttle/Pedal Position Sensor/Switch C Circuit Intermittent Stop driving
- P0300 Random/Multiple Cylinder Misfire Detected Stop driving
- P061B Internal Control Module Torque Calculation Performance Stop driving
- P0638 Throttle Actuator Control Range/Performance — Bank 1
- P0639 Throttle Actuator Control Range/Performance — Bank 2
- P2004 Intake Manifold Runner Control Stuck Open — Bank 1
- P2005 Intake Manifold Runner Control Stuck Open — Bank 2
- P2006 Intake Manifold Runner Control Stuck Closed — Bank 1
- P2007 Intake Manifold Runner Control Stuck Closed — Bank 2
- P2100 Throttle Actuator A Control Motor Circuit/Open Stop driving
- P2101 Throttle Actuator A Control Motor Circuit Range/Performance Stop driving
- P2102 Throttle Actuator A Control Motor Circuit Low Stop driving
- P2103 Throttle Actuator A Control Motor Circuit High Stop driving
- P2104 Throttle Actuator Control System — Forced Idle Stop driving
- P2106 Throttle Actuator Control System — Forced Limited Power
- P2107 Throttle Actuator A Control Module Processor Stop driving
- P2108 Throttle Actuator A Control Module Performance Stop driving
- P2110 Throttle Actuator A Control System — Forced Limited RPM
- P2112 Throttle Actuator A Control System — Stuck Closed Stop driving
- P2118 Throttle Actuator A Control Motor Current Range/Performance
- P2119 Throttle Actuator A Control Throttle Body Range/Performance Stop driving
- P2135 Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation Stop driving
- P2136 Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation Stop driving
- P2137 Throttle/Pedal Position Sensor/Switch B/C Voltage Correlation Stop driving
- P2141 Exhaust Gas Recirculation Throttle Control Circuit A Low
- P2142 Exhaust Gas Recirculation Throttle Control Circuit A High
- P2163 Throttle/Pedal Position Sensor A/B Maximum Stop Performance
- P2172 Throttle Actuator Control System — Sudden High Air Flow Detected
- P2173 Throttle Actuator Control System — High Air Flow Detected
- P2174 Throttle Actuator Control System — Sudden Low Air Flow Detected
- P2175 Throttle Actuator Control System — Low Air Flow Detected
- P2262 Turbocharger/Supercharger Boost Pressure A Not Detected — Mechanical
- P2338 Cylinder 3 Above Knock/Combustion Vibration Sensor Threshold
- P2339 Cylinder 4 Above Knock/Combustion Vibration Sensor Threshold
- P2341 Cylinder 6 Above Knock/Combustion Vibration Sensor Threshold
- P2A0A Manifold Absolute Pressure Sensor B Circuit
- P2A0B Manifold Absolute Pressure Sensor B Circuit Range/Performance
- P2A0C Manifold Absolute Pressure Sensor B Circuit Low
- P2A0D Manifold Absolute Pressure Sensor B Circuit High
- P2A0E Manifold Absolute Pressure Sensor B Circuit Intermittent/Erratic
- U0107 Lost Communication With Throttle Actuator A Control Module Stop driving
- U0308 Software Incompatibility With Throttle Actuator Control Module
- U0408 Invalid Data Received From Throttle Actuator A Control Module
Moderate
137
- P0069 Manifold Absolute Pressure — Barometric Pressure Correlation
- P0095 Intake Air Temperature Sensor 2 Circuit Bank 1
- P0096 Intake Air Temperature Sensor 2 Circuit Range/Performance Bank 1
- P0097 Intake Air Temperature Sensor 2 Circuit Low Bank 1
- P0098 Intake Air Temperature Sensor 2 Circuit High Bank 1
- P0099 Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1
- P009A Intake Air Temperature/Ambient Air Temperature Correlation
- P00F3 Humidity Sensor Circuit Range/Performance
- P00F4 Humidity Sensor Circuit Low
- P0104 Mass or Volume Air Flow Sensor A Circuit Intermittent
- P0109 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent
- P0110 Intake Air Temperature Sensor 1 Circuit Bank 1
- P0111 Intake Air Temperature Sensor 1 Circuit Range/Performance Bank 1
- P0112 Intake Air Temperature Sensor 1 Circuit Low Bank 1
- P0113 Intake Air Temperature Sensor 1 Circuit High Bank 1
- P0114 Intake Air Temperature Sensor 1 Circuit Intermittent Bank 1
- P011B Engine Coolant Temperature/Intake Air Temperature Correlation
- P0127 Intake Air Temperature Too High
- P0129 Barometric Pressure Too Low
- P012B Turbocharger/Supercharger Inlet Pressure Sensor A Circuit Range/Performance
- P016C Closed Loop Air/Fuel Ratio Control At Limit - System Too Lean
- P024A Charge Air Cooler Bypass Control A Range/Performance
- P026A Charge Air Cooler Efficiency Below Threshold
- P026D Fuel Injection Quantity A Higher Than Expected
- P02E3 Diesel Intake Air Flow A Control Circuit High
- P02E8 Diesel Intake Air Flow A Position Sensor Circuit Low
- P0487 Exhaust Gas Recirculation Throttle Control Circuit A/Open
- P0488 Exhaust Gas Recirculation Throttle Control Circuit A Range/Performance
- P04D9 Closed Loop Exhaust Gas Recirculation Control At Limit — Flow Too Low
- P04DB Crankcase Ventilation System Disconnected
- P04E2 Crankcase Ventilation Hose Connection Sensor Circuit Low
- P04FB Crankcase Ventilation Hose Connection Sensor Range/Performance
- P04FC Crankcase Ventilation System Performance
- P0505 Idle Air Control System
- P0506 Idle Air Control System RPM Lower Than Expected
- P0507 Idle Air Control System RPM Higher Than Expected
- P050A Cold Start Idle Control System Performance
- P0519 Idle Air Control System Performance
- P051B Crankcase Pressure Sensor A Circuit Range/Performance
- P051C Crankcase Pressure Sensor A Circuit Low
- P051D Crankcase Pressure Sensor A Circuit High
- P0660 Intake Manifold Tuning Valve Control Circuit/Open Bank 1
- P0663 Intake Manifold Tuning Valve Control Circuit/Open Bank 2
- P2008 Intake Manifold Runner Control Circuit/Open Bank 1
- P2009 Intake Manifold Runner Control Circuit Low — Bank 1
- P200A Intake Manifold Runner Performance Bank 1
- P200B Intake Manifold Runner Performance Bank 2
- P2010 Intake Manifold Runner Control Circuit High — Bank 1
- P2011 Intake Manifold Runner Control Circuit/Open Bank 2
- P2012 Intake Manifold Runner Control Circuit Low — Bank 2
- P2013 Intake Manifold Runner Control Circuit High — Bank 2
- P2014 Intake Manifold Runner Position Sensor/Switch Circuit Bank 1
- P2015 Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 1
- P2016 Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 1
- P2017 Intake Manifold Runner Position Sensor/Switch Circuit High Bank 1
- P2018 Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1
- P2019 Intake Manifold Runner Position Sensor/Switch Circuit Bank 2
- P2020 Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 2
- P2021 Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2
- P2022 Intake Manifold Runner Position Sensor/Switch Circuit High Bank 2
- P2023 Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 2
- P2070 Intake Manifold Tuning Valve Stuck Open — Bank 1
- P2071 Intake Manifold Tuning Valve Stuck Closed — Bank 1
- P2072 Throttle Actuator Control System — Ice Blockage Bank 1
- P2073 Manifold Absolute Pressure/Mass Air Flow — Throttle Position Correlation at Idle
- P2074 Manifold Absolute Pressure/Mass Air Flow — Throttle Position Correlation at Higher Load
- P2075 Intake Manifold Tuning Valve Position Sensor/Switch Circuit Bank 1
- P2076 Intake Manifold Tuning Valve Position Sensor/Switch Circuit Range/Performance Bank 1
- P2077 Intake Manifold Tuning Valve Position Sensor/Switch Circuit Low Bank 1
- P2078 Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1
- P2079 Intake Manifold Tuning Valve Position Sensor/Switch Circuit Intermittent Bank 1
- P2109 Throttle/Pedal Position Sensor A Minimum Stop Performance
- P2113 Throttle/Pedal Position Sensor B Minimum Stop Performance
- P2114 Throttle/Pedal Position Sensor C Minimum Stop Performance
- P2115 Throttle/Pedal Position Sensor D Minimum Stop Performance
- P2116 Throttle/Pedal Position Sensor E Minimum Stop Performance
- P2117 Throttle/Pedal Position Sensor F Minimum Stop Performance
- P2164 Throttle/Pedal Position Sensor B Maximum Stop Performance
- P2165 Throttle/Pedal Position Sensor C Maximum Stop Performance
- P2166 Throttle/Pedal Position Sensor D Maximum Stop Performance
- P2167 Throttle/Pedal Position Sensor E Maximum Stop Performance
- P2168 Throttle/Pedal Position Sensor F Maximum Stop Performance
- P2176 Throttle Actuator A Control System — Idle Position Not Learned
- P2177 System Too Lean Off Idle Bank 1
- P2178 System Too Rich Off Idle Bank 1
- P2179 System Too Lean Off Idle Bank 2
- P2187 System Too Lean at Idle Bank 1
- P2189 System Too Lean at Idle Bank 2
- P2192 System Too Rich at Higher Load Bank 1
- P2194 System Too Rich at Higher Load Bank 2
- P2199 Intake Air Temperature Sensor 1/2 Correlation
- P219A Bank 1 Air-Fuel Ratio Imbalance
- P219B Bank 2 Air-Fuel Ratio Imbalance
- P219F Cylinder 4 Air-Fuel Ratio Imbalance
- P21A0 Cylinder 5 Air-Fuel Ratio Imbalance
- P2226 Barometric Pressure Sensor A Circuit
- P2227 Barometric Pressure Sensor A Circuit Range/Performance
- P2228 Barometric Pressure Sensor A Circuit Low
- P2229 Barometric Pressure Sensor A Circuit High
- P2230 Barometric Pressure Sensor A Circuit Intermittent/Erratic
- P2279 Intake Air System Leak Bank 1
- P2280 Air Flow Restriction/Air Leak Between Air Filter and Mass Air Flow Sensor Bank 1
- P2281 Air Leak Between Mass Air Flow Sensor and Throttle Body
- P2282 Air Leak Between Throttle Body and Intake Valves
- P2374 Turbocharger/Supercharger Inlet Pressure Sensor B Circuit
- P2375 Turbocharger/Supercharger Inlet Pressure Sensor B Circuit Range/Performance
- P2390 Diesel Intake Air Flow B Control Circuit/Open
- P2391 Diesel Intake Air Flow B Control Performance
- P2392 Diesel Intake Air Flow B Control Circuit Low
- P2393 Diesel Intake Air Flow B Control Circuit High
- P2394 Diesel Intake Air Flow B Control Stuck Open
- P2395 Diesel Intake Air Flow B Control Stuck Closed
- P2396 Diesel Intake Air Flow B Position Sensor Circuit
- P2397 Diesel Intake Air Flow B Position Sensor Range/Performance
- P2398 Diesel Intake Air Flow B Position Sensor Circuit Low
- P2399 Diesel Intake Air Flow B Position Sensor Circuit High
- P2413 Exhaust Gas Recirculation System Performance
- P2425 Exhaust Gas Recirculation Cooling Valve Control Circuit Open
- P24F2 Exhaust Gas Recirculation Temperature/Charge Air Cooler Temperature Correlation
- P2522 Air Conditioning Request B Circuit
- P2604 Intake Air Heater A Circuit Range/Performance
- P2605 Intake Air Heater B Circuit/Open
- P2606 Intake Air Heater B Circuit Range/Performance
- P2607 Intake Air Heater B Circuit Low
- P2608 Intake Air Heater B Circuit High
- P2609 Intake Air Heater System Performance
- P2620 Throttle Position Output Circuit Open
- P2621 Throttle Position Output Circuit Low
- P2622 Throttle Position Output Circuit High
- P2AB3 Cold Start Intake Manifold Runner Control Stuck Open Bank 1
- P2AB4 Cold Start Intake Manifold Runner Control Stuck Open Bank 2
- P2AB5 Cold Start Intake Manifold Runner Control Stuck Closed Bank 1
- P2AB6 Cold Start Intake Manifold Runner Control Stuck Closed Bank 2
- P2ADF Intake Air System Leak Bank 2
- P2B89 Intake Air O2 Sensor Circuit Low Voltage Bank 1
- P2D2D Cold Start Intake Manifold Runner Performance Bank 1
- P2D2E Cold Start Intake Manifold Runner Performance Bank 2
Low
17
- P0508 Idle Air Control System Circuit Low
- P0509 Idle Air Control System Circuit High
- P0510 Closed Throttle Position Switch
- P0511 Idle Air Control Circuit
- P0518 Idle Air Control Circuit Intermittent
- P0540 Intake Air Heater A Circuit
- P0541 Intake Air Heater A Circuit Low
- P0542 Intake Air Heater A Circuit High
- P0543 Intake Air Heater A Circuit Open
- P0640 Intake Air Heater Control Circuit
- P0661 Intake Manifold Tuning Valve Control Circuit Low — Bank 1
- P0662 Intake Manifold Tuning Valve Control Circuit High — Bank 1
- P0664 Intake Manifold Tuning Valve Control Circuit Low — Bank 2
- P0665 Intake Manifold Tuning Valve Control Circuit High — Bank 2
- P2675 Air Cleaner Inlet Control Circuit/Open
- P2676 Air Cleaner Inlet Control Circuit Low
- P2677 Air Cleaner Inlet Control Circuit High
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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