Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Toyota Tundra. 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 with Toyota held tester or Enhanced OBD II scan tool, see Fig 1-Fig 2 . For diagnosis and repair procedure with generic OBD II scan tool, see Fig 3-Fig 4 .

For ECM location, see Figure. For ECM connector view, see Figure. For HO2S circuit wiring diagram, see Figure. For testing of systems or components, see BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article or SYSTEM & COMPONENT TESTING - V6 & V8 article. For removal and installation of components, see REMOVAL & INSTALLATION - V6 & V8 article.

Fig 1: DTCs P2120, P2122, P2123, P2125, P2127, P2128 & P2138 Diagnostic Procedure Using Hand-Held Tester (Steps 1-3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DTCs P2120, P2122, P2123, P2125, P2127, P2128 & P2138 Diagnostic Procedure Using Hand-Held Tester (Steps 4-5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: DTCs P2120, P2122, P2123, P2125, P2127, P2128 & P2138 Diagnostic Procedure Using OBD II Scan Tool (Steps 1-2)

Fig 4: DTCs P2120, P2122, P2123, P2125, P2127, P2128 & P2138 Diagnostic Procedure Using OBD II Scan Tool (Steps 3-4)