Engine code: P0171 | Troubleshooting & FIX | 2017 WRX

[@beaches2mountains230]

WITH THESE OILED AFTERMARKET FILTERS THE MAF IS THE 1ST PLACE I LOOK OR ANY VACUUM LEAKS BETWEEN INTAKE FILTER AND TURBO..ALSO THE PRIMARY OR 1ST 02 SENSOR CAN HAVE SIMILAR EFFECTS.

[@MrCliffWorks]

Yes. I repositioned and tightened the filter and supporting pipes and clamps. The COBB Intake tube and filter have a pretty sloppy fitment.