Where is Bank 1, the firewall side or the radiatior side on a 3.0 liter V6 Highlander


Asked by jowlett Oct 31, 2007 at 10:42 PM about the 2003 Toyota Highlander Base V6 4WD

Question type: Maintenance & Repair

4 Answers


Bank 1 for what sensor/system?


Bank 1 sensor 1 P0-135 oxygen sensor - O2 heater sensor ciruit does not work. Where is the sensor located?

10 out of 10 people think this is helpful.

I believe it is the radiator side, however, you may also need to look at the ones down near the catalytic convertor. Unplug each one individually and see if any new codes appear.

2 out of 2 people think this is helpful.

Bank 1 is the rear engine bank. uncsrewing any sensor will throw a code. Could also be dirty MAF or air filter, test the sensor with a proper scanner to confirm operation and check mass air flow to confirm.

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