Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.

For diagnosis and repair procedure, see Fig 2-Fig 4 . For circuit wiring diagram, see Fig 1. When prompted to perform confirmation driving pattern, see TEST DRIVE CONFIRMATION .

For ECM location, see Figure. For ECM connector view, see Figure. For testing of systems or components, see SYSTEM & COMPONENT TESTING - V6 & V8 article. For removal and installation of components, see REMOVAL & INSTALLATION - V6 & V8 article.

Fig 1: HO2S (Bank 1 & 2, Sensor 2) Circuit Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DTCs P0136 & P0156 Diagnostic Procedure (Steps 1-3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: DTCs P0136 & P0156 Diagnostic Procedure (Steps 4-5)

Fig 4: DTCs P0136 & P0156 Diagnostic Procedure (Step 5 Cont. & Steps 6-7)