HELP code P1135

[surc111]

Air/fule ratio sensor (bank1 sensor1) malfuntion on 2002 Sienna.
Is this a sensor malfuntion or could there be another reason for this malfuntion.
This is avery expensive part and hard to get to it.I hate to replase it and be something else.
A friend had same code and walked out of a local Toyota dealer with a $1400 bill.

[TS Support]

Trouble area

Open or in heater circuit of A/F sensors
(bank 1, 2 sensor 1)

A/F sensors (bank 1, 2 sensor 1) heater

ECM

INSPECTION PROCEDURE
1 Check voltage between terminal HAFR, HAFL of ECM connector and body
ground.
OK - Check and replace ECM
NG - continue
2 Check resistance of A/F sensor heaters (bank 1, 2 sensor 1)
NG - Replace A/F sensors (bank 1, 2 sensor 1).
OK - Check and repair harness or connector between EFI main relay (Marking: EFI) and A/F sensors (bank 1, 2 sensor 1) and ECM