The following warning indicates a possible problem in the brake system.
Immediately stop the vehicle in a safe place and contact your Toyota dealer.

If a warning light turns on or a warning buzzer sounds...
Stop the vehicle immediately.Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) (P2237-P2239,P2252,P2253)
DESCRIPTION
Refer to DTC P2195 (See page ).
HINT:
Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel
ratio sensor.
DTC No.
DTC Detection Condition
Trouble Area
P2237
...
Removal
REMOVAL
PROCEDURE
1. REMOVE PARKING BRAKE PEDAL ASSEMBLY
HINT:
Refer to the instructions for Removal of the parking brake pedal assembly (See
page ).
2. REMOVE NO. 1 PARKING BRAKE CABLE ASSEMBLY
(a) Remove the clip.
...
System Description
SYSTEM DESCRIPTION
1. SYSTEM DESCRIPTION
(a) The Electronic Controlled Automatic Transaxle (ECT) is an automatic transaxle
that has its shift timing electronically controlled by the Transmission Control
Module (TCM). The TCM detects electrical signals th ...