I get a code cat,eva,o25,htr whats this saying

Hello, The readouts your are presenting here are specific to the manufacturer of the code reader, not the actual OBD2 codes that provide fault information. The OBD2 codes you are looking for will be in this form: P12345. An example would be P0300 or P1251. However, from what you've posted here, it seems the heated O2 sensor (Oxygen sensor) may have failed, or it may have recognized a deficient catalytic converter. These, like all things that turn on the check engine light, are emission system issues, which effects the amount of pollution your vehicle is producing, as well as the amount of fuel mileage you will get from your vehicle. A secondary effect may be failing state inspections. When it comes to O2 sensors and catalytic converters (both on your exhaust system), diagnosis is pretty quick and easy for the trained technician.