Engine Problem

#1
I have a problem with a 2004/5 Toyota Corrola 160i GLS (4zz motor), it shows me a P1656 OCV circuit bank 1 and P0135 Oxygen sensor heater circuit problem. What does this mean and were is the problem:(
 
#2
Troubleshooting your engine - that's a large arena. After all, most of your car is engine. Or at least the part that you need. Your car's engine is made up of many systems that all have to work together in order to make your car run the way it should. The best way to troubleshoot your engine is to observe the problem and the symptoms, then trace those symptoms to the most likely repairs. We can help you do just that.
 
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