CEL Light, Got PO 171 System Lean Bank 1 on 2002 Toyota Camry

Car starts and runs as usual. Cleaned MAF. CEL has returned.
Any suggestions for next move.

Asked by for the 2002 Toyota Camry
1 answer
Check for vacuum leak, lazy 02 sensor(1). Replace fuel filter. Check MAF/ 02 data with a real scanner.
Any exhaust leaks around the front 02 sens?