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What is the p0136 error code on a Toyota rav4?

P0136- O2 Sensor Circuit Malfunction (Bank 1, Sensor 2 or A/F Sensor 1)

When the OBD-II monitors detect that the upstream oxygen sensor voltage drops from normal to the lean voltage of around 200m V for more than ten to fifty seconds under a variety of vehicle load, speed and fuel trim cell conditions, trouble code P0136 will set if vehicle load and engine RPM are greater than the upper thresholds determined.