Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
O2S Test Results (Mode 05) (SS002-03)
Reference number: SS002-03
O2S TEST RESULTS (MODE 05)
TECHNICAL SERVICE BULLETIN
| LEXUS: | All 1996-2003 & RX330 |
| SECTION: | Special Service Tools |
| COPYRIGHT: | © 2018 Lexus, a division of Toyota Motor Sales, USA License Agreement TMS1002 |
Introduction
This Service Bulletin contains Oxygen Sensor (O2S) Monitor threshold values for all models from 1996 to 2003 and some 2004 models. Starting in 2004, the O2S Monitor threshold values can be found in the repair manual. These values are used when analyzing the O2S test results to determine the O2S condition.
Applicable Vehicles
- All 1996 - 2003 model year Lexus vehicles.
- 2004 model year RX 330 vehicles.
Function Description
Checking O2S Test Results
To view O2S test results, the O2S Monitor must be completed and the test results must be checked within the same key cycle. If the ignition key is cycled OFF, the O2S test results will be set to the minimum or maximum limits, and all test results will be erased. The O2S test results are stored in the ECU (SAE term: Powertrain Control Module/PCM) when the monitor is complete. The test results are static and will not change once the monitor is complete.
The process for checking O2S test results is described in the following three basic steps:
- Completing the O2S Readiness Monitor.
- Accessing O2S Test Results.
- Comparing O2S Test Results to Failure Thresholds.
Required SST's
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.