multifrag

My Mazda 3 1.6 ts2 (2005) won't start after yesterday washing up. The battery was almost flat so I took it for charging. Put the battery back today and the engine doesn't want to start. First thought was either the spark or fuel. I had just put 10L of petrol, so that is out the question. Pump maybe? Connected my obd2 dongle and checked your codes. Both sparks and fuel went through, but 02 sensor happens to have some problems. Might it be the culprit to my problem or there something else I should look into. Thank you in advance


P.S. I did look into the fuse boxes and checked all of them.