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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Car starts and runs as usual. Cleaned MAF. CEL has returned.
Any suggestions for next move.
Thanks.
(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?