Intake measuring sensors
The intake measuring sensors: how much air came in, at what temperature and under what pressure. The coolant temperature sensor and the fuel rail pressure sensor live here too — the unit leans on them when calculating the mixture.
17 codes in this section, 17 with a guide
What it usually turns out to be
- The air sensor lies more often than it goes silent: look at its readings at idle, not only at the code.
- On a cold car the intake air, coolant and ambient temperatures must all agree.
- A lying intake air temperature sensor looks like higher fuel use rather than a fault.
P0100Mass air flow circuit malfunctionguideP0101Mass air flow circuit range/performanceguideP0102Mass air flow circuit low inputguideP0103Mass air flow circuit high inputguideP0106Manifold absolute pressure circuit range/performanceguideP0107Manifold absolute pressure circuit low inputguideP0108Manifold absolute pressure circuit high inputguideP0111Intake air temperature circuit range/performanceguideP0112Intake air temperature circuit low inputguideP0113Intake air temperature circuit high inputguideP0116Engine coolant temperature circuit range/performanceguideP0117Engine coolant temperature circuit low inputguideP0118Engine coolant temperature circuit high inputguideP0128Coolant thermostat — temperature below regulating temperatureguideP0190Fuel rail pressure sensor — malfunctionguideP0191Fuel rail pressure sensor — reading out of rangeguideP0193Fuel rail pressure sensor — high signalguide
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Other sections
Fuel and air metering, general 33Oxygen sensors 19Throttle and accelerator pedal 15Mixture: lean and rich 11Fuel and air metering: injectors 25Ignition system and misfires 29Exhaust gas recirculation (EGR) 7Secondary air injection 3Catalytic converter 4Canister and purge valves 9Fuel vapour leaks 7Fuel level in the tank 4Diesel particulate filter 6Idle and auxiliary systems 22Control module and its circuits 21Transmission 17Communication between modules 20Brakes, ABS and stability control 17Body, airbags and lighting 12