2002 Toyota Tundra Check Engine Light On - Code P1135?

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The check engine light came on in my 2002 Toyota Tundra pick-up truck. It has the 3.4L V6 engine. It has over 100,000 miles on it.

On the advice of a friend I took it to Auto Zone for a free diagnostic check. The error code retrieved from the check is:

P1135 Air/Fuel sensor heater circuit response (bank 1 sensor1).

What is wrong? Can I fix this myself?

Serious answers please. We live on a fixed income. That means we have to live on what we have left after we: Fix the car, Fix the Washing Machine, Fix the Lawn Mower, etc.
 
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