Codes P0135 and P0155?

BRUX

MEMBER
2001 TOYOTA SIENNA
3.0L
6 CYL
2WD
AUTOMATIC
125,000 MILES

I know these are O2 sensors. Are they the same part in two different locations along the exhaust? I provided images of the obdII readouts.

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Wednesday, March 8th, 2023 AT 12:18 PM

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,716 POSTS

Hi,

The codes you have for sensor 1 on both banks (1 and 2). See pic 1 below for locations.

According to the part numbers, they are both air/fuel mixture sensors, and they have the same part number. See pic 2.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.

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Wednesday, March 8th, 2023 AT 8:52 PM

BRUX

MEMBER
6 POSTS

Yes, very helpful. Thank you, Joe. I hadn't really thought of the engine as it is depicted in that diagram either.

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Wednesday, March 8th, 2023 AT 9:06 PM

JACOBANDNICKOLAS

MECHANIC
109,716 POSTS

No problem whatsoever. Let me know if there is anything I can do to help or if you have questions.

Take care,

Joe

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Wednesday, March 8th, 2023 AT 9:39 PM

BRUX

MEMBER
6 POSTS

Just noticed that the part numbers are almost identical. I'm not sure if this is an important observation, or if I understand what I am seeing.
In the image, I've underlined the discrepancy in red.

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