How can I fix codes P1135 and P1155

Tiny
ALEXRAY
  • MEMBER
  • 2000 LEXUS RX 300
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 99,230 MILES
Please how can I fix this, after I check the code.
1. P1135 it said air/fuel ratio sensor 1, bank 1-heater circuit malfunction.
Wiring, air fuel ratio sensor ECM.
2. P1155 air/fuel ratio sensor 1, bank 2- heater circuit malfunction.
Tuesday, December 27th, 2016 AT 8:10 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 34,165 POSTS
Oxygen sensors don't work until they're up to about 600 degrees Fahrenheit. They have electric heaters in them to get them there faster after engine start-up. To have the same fault code for multiple sensors suggests there's a broken wire going to those sensors.

Bank one and two refer to the two sides of the engine. Sensor one refers to the sensor in front of the catalytic converter.
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Thursday, December 29th, 2016 AT 3:19 PM

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