Diagnosis & Repair

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

For wiring diagram, see DTC P0031: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK NO. 1 SENSOR NO. 1) & DTC P0032: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK NO. 1 SENSOR NO. 1) . For diagnosis and repair, see Fig 1-Fig 7 . For testing of systems or components, see BASIC DIAGNOSTIC PROCEDURES - 4-CYLINDER article or SYSTEM & COMPONENT TESTING - 4-CYLINDER article. To check ECM inputs and outputs, see PIN VOLTAGE CHARTS article. For removal and installation of components, see REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.

Fig 1: DTCs P0171 & P0172 Diagnostic Procedure (Steps 1-4)

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Fig 2: DTCs P0171 & P0172 Diagnostic Procedure (Steps 5-9)

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Fig 3: DTCs P0171 & P0172 Diagnostic Procedure (Step 9 Cont.)

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Fig 4: DTCs P0171 & P0172 Diagnostic Procedure (Steps 10-11)

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Fig 5: DTCs P0171 & P0172 Diagnostic Procedure (Steps 12-13)

Fig 6: DTCs P0171 & P0172 Diagnostic Procedure (Steps 14-19)

Fig 7: DTCs P0171 & P0172 Diagnostic Procedure (Steps 20-21)