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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.
Thanks.

Asked by for the 2002 Toyota Camry
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?
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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?