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Discussion Starter #1
I followed several sites, testing as much as I could, I still cant figure it out. My connector has no letters or numbers that i can see for the four terminals. Still with key out none have voltage. with key to on, but engine off, I get 12.x, 2.x, 3.x, and 3.x for the four terminals. Now what?

tks,
p
 

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Discussion Starter #2
I think Bank 1 Sensor 1 heater is broken. Im going to get a replacement. First the junkyard, if swapping it makes the eng light go away, then I will buy a new one. I know the junkyard unit could be bad, but i dont want to spend the money on a new unit, until Im sure, that is the issue. maybe i get two at the JY.

AIR–FUEL RATIO (A/F) SENSOR Bank 1 Sensor 1

is above the same part as the rear unit:

HEATED OXYGEN SENSOR Bank 1 Sensor 2

Also, what size the nuts? My 11 mm wont fit, but the 12 mm is very sloppy. Nuts are corroded a bit not that bad.

2003 toy tacoma 2.4L 56k miles.

tks much,
pa
 

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AIR–FUEL RATIO (A/F) SENSOR Bank 1 Sensor 1

is above the same part as the rear unit:

HEATED OXYGEN SENSOR Bank 1 Sensor 2



No there not the same, look the same, but the plugs are different..OHM the sensor across the terminals to see if the heater in it is shorted..

The nuts are 12mm ..Try a 6point 12mm socket
 
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