Hi.

I have a query, I took my car to the review of my country and it turned out with high hydrocarbon values; I already changed spark plugs, coils and oxygen sensor and it remains the same. Anyone know what else it could be?

Thanks.

 

is hydrocarbon related to catalytic converter?if it is then youd probably have broken catalyticconverter

 

Leaky fuel injector(s), clogged air filter/intake pipe, low compression... High HC means that you have un-burnt fuel entering the exhaust that is in excess of what the ECU can adjust for. Could also be that the ECU is at fault, but properly diagnose the issue before randomly throwing parts at it.