Codes p0135 and p0155?

2001 TOYOTA SIENNA
125,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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BRUX
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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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Mar 8, 2023 at 12:18 PM
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JACOBANDNICKOLAS
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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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Mar 8, 2023 at 8:52 PM
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BRUX
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Yes, very helpful. Thank you, Joe. I hadn't really thought of the engine as it is depicted in that diagram either.
Mar 8, 2023 at 9:06 PM
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JACOBANDNICKOLAS
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No problem whatsoever. Let me know if there is anything I can do to help or if you have questions.

Take care,

Joe
Mar 8, 2023 at 9:39 PM
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BRUX
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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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Mar 9, 2023 at 12:26 AM
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BRUX
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I'm guessing that if there is a difference, it would be in the length of the connector lead and possibly to the connector head itself.
Mar 9, 2023 at 12:32 AM
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JACOBANDNICKOLAS
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Hi,

I agree. Let me know how things turn out for you or if you have other questions.

Take care,

Joe
Mar 9, 2023 at 7:25 PM