2nd gen rav4 "check engine" light on

Hi guys! Just wondering why my 2005 rav4 has the check engine light on. Minsan wala pero most of the time meron.

What i did recently was change oil. Pero nandun parin sya. Hirap lang mapinpoint nung problema.dahil wala akong maramdaman na symptoms. I'm thinking na baka tune up lang katapat neto siguro.

Need your advise guys before i have it checked. Salamat ng marami!

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