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Diagnostic code P0135 on a 2001 Toyota Land Cruiser indicates a malfunction in the oxygen sensor circuit for the upstream (pre-catalytic converter) oxygen sensor. This code typically means that the sensor is not providing the expected voltage signal to the engine control module (ECM), which can result from a faulty sensor, wiring issues, or poor connections. Addressing this code usually involves inspecting the oxygen sensor and its wiring, and replacing the sensor if necessary.

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AnswerBot

7mo ago

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