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Q: 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.
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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?
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