Check engine light code P1155

2000 TOYOTA SIENNA

180,000 MILES • 6 CYL • 2WD • AUTOMATIC

LARNCAR

MEMBER
1 POST
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I saw P1151, P1153 and P1155 codes and was advised to have the rear (after Y) catalytic replaced. Now it's down to P1155 however I seem to get conflicting information as to which sensor this is (From web site: P1155 O2 Sensor Heater Circuit Intermittent (Bank 2 Sensor 2) another site indicated (Bank 2 Sensor 1)).

Your help please ...which one is P1155?
radiator side exaust of engine
firewall side exaust of engine
or the one after the converter I had replaced.

A huge thank you!!

Jul 21, 2010 at 7:06 PM

KASEKENNY

CAR REPAIR CONTRIBUTOR
18,907 POSTS

I am attaching the info below on this code, so we need to run through this testing and find out if the ECM is the issue.

Here is a guide that will help with this testing:

https://www.2carpros.com/articles/how-to-check-wiring

As for which bank this is, I am attaching the detail on this below, but this is going to be the bank on the front of the engine closest to the radiator.

Please run through this info and let us know what other questions you have.

Thanks

Images (Click to enlarge)

Mar 14, 2022 at 4:25 PM

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