A tip. When asking questions about the Solara it's best to mention the year and sometimes the model. There are huge differences between the generation I and generation II models.
To try and answer your question, there is no err1 code (unless the code reader you're using drops the zeros.) The closest is code P0100 which indicates a Mass or Volume Air Flow Circuit Malfunction.
Cheers
Trouble code P0420 means:Catalyst system efficiency below threshold
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O2 sensor
code p 0446
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Post your code here.
Trouble code P0773 means:Shift solenoid E electrical
Trouble code P0770 means:Shift solenoid E malfunction
Under the drivers side of the dash.
Trouble Code P1705 means:NC2 revolution sensor circuit malfunction