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Home >> Lexus >> 2002 >> IS 300 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (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 LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. If any other codes (besides DTC P0134 and P0154) are output, diagnose those DTCs first. If not, go to next step.
  2. Check connection of PCV piping. Repair or replace PCV piping. 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. Read the voltage output of the heated oxygen sensor when the engine is suddenly raced. Perform quick racing to 4000 RPM 3 times using the accelerator pedal. If heated oxygen sensor outputs a RICH signal (.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, 2 sensor 1). 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. Check air induction system. Ensure oil dipstick, oil filler cap, PCV system and all other air induction system components are intact and operating properly. Repair as necessary. If okay, go to next step.
  7. Check fuel pressure. See FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. Repair as necessary. If okay, go to next step.
  8. Check injector injection. See FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. Repair as necessary. If okay, go to next step.
  9. Check exhaust system for leaks. Repair as necessary. If okay, replace heated oxygen sensor (bank 1, 2 sensor 1).
  10. Perform test drive confirmation. See CONFIRMATION DRIVING PATTERN  under DTC P0130, DTC P0150, DTC P2195, DTC P2196, DTC P2197 OR DTC P2198. Go to next step.
  11. If DTC P0134 and P0154 are output again, check and replace ECM. If DTCs are not output again, go to next step.
  12. Check if vehicle ran out of fuel in the past. If not, check for intermittent problems. If yes, DTC P0134 and P0154 is caused by vehicle running out of fuel.
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