Question about 2001 Toyota Highlander
P1155 Air/Fuel Sensor Heater Circuit. (Bank 2 Sensor 1)
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 (remember rated this).
Posted on Aug 07, 2010
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Posted on Jan 02, 2017
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