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Q: oxygen heater circut malfunction on 2003 Toyota Sienna

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
code po135 can not locate problem have replaced both front and back oxygen sensors any advice?
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P0135 indicates a fault in the cylinder bank #1, O2 sensor #1 heater circuit. Check for 12 volts and ground when the engine's running cold. the heater won't be on all the time so you need to see it on sometimes. If not, look for a fault in the wiring or the connector at Bank 1 Senosr 1 circuiut.
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