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Home >> Lexus >> 2004 >> IS 300 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0134: Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1) Or DTC P0154: Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 1) >> Diagnosis & Repair
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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Retrieve trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other codes are displayed other than DTC P0134 or P0154, diagnose and repair those codes first. If only DTC P0134 or P0154 is displayed, go to next step.
  2. Check connection of PCV piping. Repair as necessary. If okay, go to next step.
  3. Connect the OBD-II scan tool or hand-held tester to Data Link Connector No. 3 (DLC3). See Figure. Warm up the engine to normal operating temperature. Read the voltage output of the heated oxygen sensor when the engine is suddenly raced to 4000 RPM 3 times using the accelerator pedal. If heated oxygen sensor output is a RICH signal (0.45 volts or more) at least once, go to step  9. If not, go to next step.
  4. Check for open and short in harness and connector between ECM and heated oxygen sensor (bank 1 and 2, sensor 1). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary. If okay, go to next step.
  5. Check whether misfire has occurred or not by monitoring DTC and data list. Perform troubleshooting for misfire as necessary. If okay, go to next step.
  6. 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.
  7. Check fuel pressure. See FUEL PRESSURE under 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.
  8. Check fuel injectors. See FUEL CONTROL under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - GS300, GS430, IS300, LS430 & SC430 article. If problem exists, repair as necessary. If problem does not exist, replace suspect heated oxygen sensor.
  9. Check for exhaust system leaks. Repair as necessary. If okay, replace heated oxygen sensor (bank 1 and 2, sensor 1).
  10. Perform test drive confirmation, then go to next step. See TEST DRIVE CONFIRMATION  under DTC P0130, DTC P0150, DTC P2195, DTC P2196, DTC P2197 OR DTC P2198.
  11. Clear and recheck for DTCs. If DTCs are displayed again, replace ECM. If DTCs are not displayed again, go to next step.
  12. Check if vehicle ran out of fuel in the past. If so, DTC is caused by vehicle running out of fuel. If not, check for intermittent problems.
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