LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - SFI System Diagnostic Introduction, Diagnostic Trouble Code Table >> SFI System >> O2S Test Result
April 5, 2026: LEMON Manuals is launched! Read the announcement.

O2S Test Result

  1. INTRODUCTION 

    The O2S TEST RESULT refers to the results of the engine control module (ECM) when it monitors the heated oxygen sensor (O2S), and it can be read using the intelligent tester or the generic OBD-II scan tool. Based on this, you can find the O2S's conditions. The ECM monitors the O2S in the various items. You can read the monitor result (TEST DATA) of each monitor item using the O2S TEST RESULT. However, the output value of the TEST DATA is the latest "snapshot" value that is taken after monitoring and therefore it is not dynamic.

    In this article, the description of the O2S TEST RESULT (for O2S related DTCs) are written in a table.

    This table consists of 5 items: 

    1. TEST ID (a code applied to each TEST DATA)
    2. Description of TEST DATA
    3. Conversion Factor (When Conversion Factor has a value written in the table, multiply the TEST DATA value appearing on the scan tool by the Conversion Factor value. The result will be the required value.)
    4. Unit
    5. Standard Value

      If the TEST DATA value appearing on the scan tool is out of the standard value, the O2S is malfunctioning. If it is within the standard value, the O2S is functioning normally. However, if the value is on the borderline of the standard value, the O2S may malfunction very soon.

  2. HOW TO READ O2S TEST RESULT USING INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. On the tester screen, select the following menus: DIAGNOSIS/CARB OBD-II/O2S TEST RESULT. A list of the O2S equipped on the vehicle will be displayed.
      Fig 1: Identifying Scan Tool Display - O2 Sensor Test
      G05263946Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Select the desired O2S and press ENTER. The following screen will appear.
    4. Press HELP and * simultaneously. More information will appear.
    5. Example:
      Fig 2: Identifying Scan Tool Display - TEST DATA Screen
      G05263947Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      1. The intelligent tester displays "17" as a value of the "TIME $81" (Procedure "A").
      2. Find the Conversion Factor value of "TIME $81" in the O2S TEST RESULT table below. 0.3906 is specified for $81 in this table (Procedure "B").
      3. Multiply "17" in procedure "A" by 0.3906 (Conversion Factor) in the procedure "B". 17 x 0.3906 = 6.6%
      4. If the answer is within the standard value, the "TIME $81" can be confirmed to be normal.

    O2S TEST RESULT Table 

    O2S TEST RESULT TABLE

    TEST ID Description of TEST DATA Conversion Factor Unit Standard Value
    $81 Percentage of monitoring time when the HO2S voltage is less than 0.05V Multiply 0.3906 % Within 60%
scientia non olet · About LEMON Manuals