Bank 1 sensor 1 Oxygen sonsor
SOURCE: diagnostic code p0135
What engine is in this vehicle? I assume the avalon would be a 3.0L or similar V6 engine. Bank 1 sensor one indicates one of the primary O 2 sensor controlling a/f ratio. Sensor one bank one would be the sensor located in the Front manifold, closest to the engine. Hope this solves your issue. I would first check the conector at this sensor for corrison before buying a new sensor.
SOURCE: OXYGEN SENSOR P0135 Error
I have the same car as yours, a 2003 Toyota Ipsum 240I with a 2AZ-FE engine and had the same Problem. I suggest you change the one closest to the battery (the one with a yellow tape). I prefer the original actually got from yahoo auction.
Testimonial: "I'm pretty sure you are spot on When I look at the manifold it looks like the one nearest to the battery (purple tape for me) serves Cylinders 1 & 4 so the error "bank 1, sensor 1" hopefully fits cylinder 1. Bit of a shot in the dark but better than 50/50 I reckon! :) "
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