Toyota Celica 2005 Repair Manual page 346

5 Check for open and short in harness and connectors between ECM and heated
oxygen sensor (See page IN−30).
OK
6 Perform confirmation of driving pattern.
GO
7 Is DTC P0136 or P0138 output again?
YES
Replace heated oxygen sensor.
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (1ZZ−FE)
NG Repair or replace harness or connector.
NO Check for intermittent problems
(See page DI−3).
345
DI−147