just had my emmission testing this morning kc paparehistro ko sentra. Result: Failed

CO - 4.62%
HC - 683ppm

sabi nung tester kailangan daw adjust ung timing. Tama po ba? E wala pa 1 month na nagpatuneup ako sa casa. Had my air filter, fuel filter, and spark plugs replaced. Also performed 45k kms checkup. Sabi pa dun sa casa eh in adjust nila ung timing.

sabi nung tester e ireklamo ko daw sa casa at ipakita ung emission test result. Pwede po ba ito?

Thanks