TOYOTA COROLLA TROUBLE CODE

Po171 Code. Car Hard To Start In Morning But Runs Great Afterwards.

The Previous Owner Replaced The Catalytic Converter Last Year. What Can Cause A Catalytic Converter Below Threshold? I Checked The Voltage...

What Does That Mean? Is It A Sensor Malfunction And Can I Fix It Myself With Marginal Car Skills? This Was My Mom's First And Only New...