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O2 / Maf Sensor, Fuel Trim Fault Finding

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I have "P0171 Fuel trim too lean (bank 1)".

Inspection of the live data reads:

MAF sensor reading - steady (I believe this means the MAF sensor is probably working OK and does not need cleaning?)

O2 sensor reading - fluctuates between about 0.1V and 0.7V (I believe this is normal operation at idle)?

So, I am stuck to know what to do next?

1. Clean MAF sensor anyway (this seems to be a sensible idea, because it won't cost anything)

2. Replace MAF sensor

3. Replace inlet manifold gasket

4. Replace O2 sensor

5. Replace CAT convertor

6. Something I haven't though of.

Any suggestions please?

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