p1155 toyota

[ddiaojay]

I have a 2001 toyota sienna with p1155 code.

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[twiggy]

I have a 2000 Sienna, and it threw the same code, which was the heater circuit malfunction for A/F sensor in bank 2 which is the one closest to the front of the van, the easy one to get to so you’re in luck.

[college man]

see if any fuses are blown. check the 02 sensor and wiring for damage. If none found replace the 02 with an OE pieceC8-)

[ddiaojay]

Thanks guys, I’ll check the fuse and keep u updated

[dreamer2355]

I agree with the above posts.

The o2 sensor will still function but will take alot longer to warm up.

Keep us posted!

[EricTheCarGuy]

+1 usually heater codes involve O2 sensor replacement but check the wiring and fuses as suggested just to be sure there isn’t some other problem that you’re dealing with.

[Author]

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