I smogged my car and barely failed a few hydrocarbons over the limit. Then I had someone weld a cat on to my car with an electric welder. They grounded the unit to the exhaust. Next day I drove smoothly to the smog place and smogged it again. #43 (fuel system malfunction or bad O2) engine light came blinking and i failed horribly. CO 7% and hydrocarbons like 300. So I am dumping lots of fuel.
Do you think these symptoms are caused by a bad oxygen sensor? Whats the best way to test the sensor without replacing it?
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