From: positivebalance41m on
getting a code P0155 error

does n e 1 know the physical location of this particular sensor and can
give some tips how to access/change the sensor?

From: Ray O on

<positivebalance41m(a)yahoo.com> wrote in message
news:1156900364.819718.111870(a)74g2000cwt.googlegroups.com...
> getting a code P0155 error
>
> does n e 1 know the physical location of this particular sensor and can
> give some tips how to access/change the sensor?
>

P0155 indicated a problem with the heater circuit of O2 sensor #1 for Bank
2.

O2 sensor #1 is located in the exhaust manifold; O2 sensor #2 is located
after the catalytic converter.

Bank 1 is always the cylinder bank with cylinder #1 so Bank 2 is the
opposite bank.

So, in the case of your Sienna, O2 sensor #1 for Bank 2 is located in the
exhaust manifold closest to the front of the car, away from the passenger
compartment. To access O2 sensor #1 for Bank 2, open the hood and look down
at the front exhaust manifold for a cylindrical object with wires coming out
the end. To change it, unplug the wires, unscrew the sensor, reverse the
process.
--

Ray O
(correct punctuation to reply)