Question about Toyota 4Runner
P1135 Air/Fuel Sensor Heater Circuit Response (Bank 1 Sensor 1)
almost certainly the heater inside the sensor has failed, the heater speeds up the time it take for the system to go into closed loop fuel control.
The bank 1 sensor one is located in the exhaust just off the engine, it is before the catalytic converter, the sensor after the cat converter is like an O2 but performs a different function and is not related to fuel mixture control, You don't say what engine u have, if it is a 4 cylinder then there is just one O2 sensor (Toyota calls them Air Fuel sensors), in the V6 engine there are 2 O2 sensors, one for each bank of cylinders bank 1 on the V6 is the passenger side cylinder bank (see diagram below), and yes you can swap sensors to see if the code switches sides.
Posted on Aug 06, 2010
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Posted on Jan 02, 2017
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