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For a toyota tacoma 2002 4x4 2.7 where is heater circuit located, and what other things can trigger sensor malfunction.

Vehicle: toyota tacoma 2002 4x4 2.7

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More than likely the problem is the Air/Fuel (A/F) Ratio Sensor Bank 1 Sensor 1

2002 Toyota Tacoma Air/Fuel Ratio Sensor Location P1135

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