Question about 2001 Toyota Highlander

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Code 1155 on a toyota highlander - 2001 Toyota Highlander

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Actually P1155 is pointing to a fault with the internal heater for the A/F Sensor (aka Oxygen Sensor) for Bank 2 Sensor 1. The PCM uses this internal heater to get the sensor to normal operating temps within a matter of seconds on cold starts. Replacing this sensor should solve your problem. This sensor is located in the front exhaust manifold.
Hope helps.

Posted on Aug 07, 2010

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