Toyota Repair: 2000 Celica GT PO172 PO300, fe engine, o2 sensor

Question
I'm getting two error codes PO172, and PO300. Replaced plugs and cleaned MAF wonder what i should change next new wires new MAF new O2 sensor. Any ideas?

Answer
The 172 code is possibly caused by the 300 which is a random misfire code, this needs to be repaired first. Is there any other code specific to one cylinder, for instance a 301 etc? Does it have the 1ZZ-FE engine? Check the underhood label and let me know which engine it has.