Subaru Crosstrek Service Manual: Dtc p0141 o2 sensor heater circuit bank 1 sensor 2
ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC P0141 O2 SENSOR HEATER CIRCUIT BANK 1 SENSOR 2
Refer to DTC P0037 for diagnostic procedure. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0037 A/F / O2 HEATER CONTROL CIRCUIT LOW BANK 1 SENSOR 2">
1. OUTLINE OF DIAGNOSIS
Detect malfunction of the rear oxygen sensor heater.
Judge as NG if it is determined that the rear oxygen sensor impedance is large by observing the engine conditions.
2. COMPONENT DESCRIPTION
(1) | Element cover (outer) | (3) | Sensor element | (5) | Sensor housing |
(2) | Element cover (inner) | (4) | Ceramic heater |
3. EXECUTION CONDITION
Secondary Parameters | Execution condition |
Battery voltage | ≥ 10.9 V |
Elapsed time after starting the engine | ≥ 1000 ms |
A/F sensor element impedance | ≤ 82 ? |
A/F sensor heater control duty | ≤ 75 % |
Rear oxygen sensor heater control duty | < 70 % |
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after 1000 ms or more have passed since the engine started.
5. DIAGNOSTIC METHOD
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Malfunction Criteria | Threshold Value |
Measured secondary oxygen sensor heater control voltage | 12 V battery system voltage ? 0.88 V |
Time needed for diagnosis: 4 ms ? 2500 times
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
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Assembly
REAR SUSPENSION > Front Lateral LinkASSEMBLY1. Before assembly, inspect the following items and replace any faulty part with a new one.• Visually check the lateral link assembly - front for damage and deformation.• Visually check the bushing for abnormal cracks, fatigue or damage.&bul ...
Caution
FRONT SUSPENSION > General DescriptionCAUTION• Wear appropriate work clothing, including a helmet, protective goggles and protective shoes when performing any work.• Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, d ...
Installation
MECHANICAL(H4DO) > V-beltINSTALLATION1. V-BELTInstall in the reverse order of removal.CAUTION:• When reusing the V-belt, wipe off dust and water with cloth.• Do not use the V-belt if there is any oil, grease or coolant on the belt.• Be careful not to rub the V-belt end surface w ...
