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Home >> Lexus >> 2004 >> IS 300 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 53 (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 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. If any DTCs besides DTC P0134 and P0154 are output, diagnose other DTCs first. If no other DTCs are output, 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 the DLC3. Warm up the engine to normal operating temperature above 169°F (75°C). Read voltage output of the heated oxygen sensors when the engine is suddenly raced. Perform quick racing to 4000 RPM 3 times using accelerator pedal. If heated oxygen sensor outputs a rich signal (.45 volts or more) at least once, go to step  10. If not, go to next step.
  4. Check for open and short in harness and connector between ECM and heated oxygen sensors (bank 1, 2 sensor 1). See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Repair as necessary. If okay, go to next step.
  5. Check whether misfire has occurred by monitoring DTC and data list. Repair as necessary. If okay, go to next step.
  6. Check air induction system. Repair as necessary. If okay, go to next step.
  7. Check fuel pressure. See FUEL PUMP PRESSURE (ALL MODELS) under FUEL DELIVERY in SYSTEM & COMPONENT TESTING - GS300, GS430, IS300 & LS430 article. Check and repair fuel pump, pressure regulator, fuel pipe line and filter as necessary. If okay, go to next step.
  8. Check injector injection. See FUEL CONTROL in SYSTEM & COMPONENT TESTING - GS300, GS430, IS300 & LS430 article. Replace injector as necessary. If okay, go to next step.
  9. Check gas leakage on exhaust system. Repair as necessary. If okay, replace heated oxygen sensor (bank 1, 2 sensor 1).
  10. Perform test drive confirmation then go to next step. See TEST DRIVE CONFIRMATION .
  11. Check if DTC P0134 and P0154 are output again. If yes, check and replace ECM. If not, go to next step.
  12. Check if vehicle may have run out of fuel in the past. If yes, DTC is caused by vehicle running out of fuel. If not, check for intermittent problems.
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