Fuel & Air Metering Trouble Codes: List & Fixes
These codes (mostly P00xx–P02xx) cover how the engine computer measures incoming air and meters fuel: the mass airflow and manifold pressure sensors, oxygen sensors, fuel trim, fuel pressure and injectors. Lean codes such as P0171 and P0174 are very often caused by an unmetered air leak – a cracked intake hose or vacuum line – rather than a failed sensor. Check hoses and the air filter housing before buying parts.
193Codes
2.5Average severity
7%High or critical
26%DIY-friendly
Severity distribution
Most viewed
P0174
Powertrain
The cylinder bank without cylinder 1 is running lean even with the maximum fuel correction…
Moderate
P0011
Powertrain
The bank 1 intake cam sits further advanced than the PCM asked for, usually an oil or control…
Moderate
P0014
Powertrain
The bank 1 exhaust cam won't follow its target and stays too far advanced; think oil, valve…
Moderate
P0021
Powertrain
The bank 2 intake cam is more advanced than commanded or slow to respond; compare it with bank…
Moderate
P0101
Powertrain
The MAF sensor's airflow reading doesn't match what the engine computer expects…
Low
P0172
Powertrain
The engine computer is pulling as much fuel as it's allowed on bank 1 and the mixture is still…
Moderate