P0171moderate Severity
System Too Lean (Bank 1)
The engine is running 'lean' on Bank 1, meaning there is too much air and not enough fuel in the combustion mixture.
Common Symptoms
- Check Engine Light illuminated
- Lack of power and sluggish acceleration
- Rough or high idle
- Poor fuel economy
Generic Causes
- Vacuum leak past the Mass Airflow Sensor (MAF)
- Dirty or failing MAF sensor
- Weak fuel pump or clogged fuel filter
- Faulty oxygen (O2) sensor
Known Cars Affected by P0171
We have cross-referenced P0171 against our database of known faults. Below are specific cars where this code frequently appears, along with the detailed diagnostic and repair instructions for that specific vehicle.
We don't currently have any specific car faults recorded in our database that trigger the P0171 code. However, the generic causes listed above should guide your diagnostic process.