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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. If other DTCs are displayed, diagnose and repair those DTCs first and retest system. If only DTC P0130 and/or P0150 are displayed, go to next step.
  2. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Start engine and increase engine speed to 2500 RPM for approximately 90 seconds. Let engine idle. Using scan tool, monitor each heated oxygen sensor No. 1 output voltage. Voltage should alternate repeatedly between less than .4 volt and more than .55 volt. If voltage is as specified, go to step  7. If voltage is not as specified, go to next step.
  3. Check for open or short in wiring between ECM and heated oxygen sensors No. 1. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  4. Ensure oil dipstick, oil filler cap, PCV system and all other air induction system components are intact and operating properly. If problem exists, repair as necessary. If problem does not exist, go to next step.
  5. Check fuel pressure. See FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure is not within specification, repair as necessary. If fuel pressure is within specification, go to next step.
  6. Check fuel injectors. See FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. If problem exists, repair as necessary. If problem does not exist, replace appropriate heated oxygen sensor No. 1.
  7. Perform test drive confirmation, then go to next step. See TEST DRIVE CONFIRMATION .
  8. Clear and recheck for DTCs. If DTC P0130 and/or P0150 are displayed again, replace ECM. If neither DTC P0130 or P0150 are displayed again, problem is intermittent. Check component and ECM connections.
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