Some 2010-2012 HS 250h vehicles equipped with a 2AZ-FXE engine may exhibit a MIL ON condition with DTC P0136 (oxygen sensor circuit malfunction; Bank 1 Sensor 1).
The oxygen sensor and Hybrid Vehicle ECU (HV ECU) logic have been modified to reduce the possibility of this condition occurring.
Model Model year Previous cal. ID New cal. ID
HS 250h 2010-2011 37503000 37503200
2010-2011 37503100 37503200
2012 37508000 37508100
Model year Previous P/N Current P/N Part name
2010-2011 89981-75030 89981-75032 Computer, hybrid control
2010-2011 89981-75031 89981-75032 Computer, hybrid control
2012 89981-75090 same Computer, hybrid control
All 89465-75010 same Oxygen sensor
- 00451-00001-LBL same Authorized modification label
NOTE: The HV ECU should NOT be replaced as part of the repair procedure.
Authorized modification labels may be ordered in packages of 25 from the Materials Distribution Center through Dealer Daily – Dealer Support Materials Orders.
TIS Techstream or Techstream Lite
P/N TSPKG1 or TSLITEDLR01
NOTE: Software version 7.10.030 or later is required.
GR8 Battery Diagnostic Station, P/N 00002-MCGR8
NOTE: The diagnostic tester is NOT recommended for flash reprogramming with this calibration file. Use TIS Techstream or an approved J2534 interface to perform this update. Visit techinfo.toyota.com for more information regarding J2534 reprogramming.
- HV ECU part number
- Calibration ID(s)
- Dealer Code
- Repair Date
- Change authority (L-SB-0035-12)
Affix the Authorized Modifications Label to the vehicle at the location shown in the photo.