P0172 – System Too Rich (Bank 1)

System: Engine
Dashboard light: Check engine light (MIL)
Check-engine blink code: —
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Description: System Too Rich (Bank 1)
Detection / symptoms: 1.Check engine light on 2.You will more than likely not notice any drivability problems, although there 3.May be symptoms such as a misfire
Possible causes: 1.The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" 2.Air filters can cause the MAF to become dirty if the filter is over-oiled 3.There is also an issue with some vehicles where the MAF sensors leak the silicone 4.Potting material used to protect the circuitry 5.There could be a vacuum leak 6.There could be a fuel pressure or delivery problem
What to check: 1.Read the code and freeze-frame data with an OBD-II scanner 2.Check the connector and wiring of the part named in the code 3.Test the part with scanner live data or a multimeter, using the values in the repair manual 4.Fix the cause, clear the code and test-drive
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)

Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights