Lambda Oxygen Sensor, AFTER Catalytic Converter. Porsche 971.1 / 971.2 Panamera 2017-23  ❭  9A7906265E

Lambda Oxygen Sensor, AFTER Catalytic Converter.

Restore accurate exhaust monitoring and dependable emissions-system operation with this OE Match Lambda Oxygen Sensor. Designed for compatible Porsche applications, this sensor is positioned AFTER the catalytic converter, where it monitors oxygen levels in the exhaust gases after they have passed through the catalyst.

Fits:

• Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD 2017-20
• Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20
• Porsche 971.1 Panamera 4 E-Hybrid 2.9L Twin-Turbo V6 Sport Turismo 2017-20
• Porsche 971.2 Panamera 2.9L V6 2021-23
• Porsche 971.2 Panamera 4 2.9L V6 2021-23
• Porsche 971.2 Panamera 4 Sport Turismo 2.9L V6 2021-23
• Porsche 971.2 Panamera 4S 2.9L V6 2021-23
• Porsche 971.2 Panamera 4S Sport Turismo 2.9L V6 2021-23  

Diagram Ref No 18

Also known as an oxygen sensor, O2 sensor or lambda probe, the downstream sensor supplies exhaust-gas information to the engine control unit (ECU). Its primary role is to help the vehicle assess catalytic converter operation and monitor the performance of the emissions-control system.

By comparing signals from lambda sensors positioned before and after the catalytic converter, the ECU can identify whether exhaust-gas treatment is occurring as expected and detect certain catalyst or sensor-related faults.

Lambda sensors operate in a particularly harsh environment, exposed to high exhaust temperatures, vibration, moisture, combustion deposits and repeated thermal cycling. Over time, the sensing element may become contaminated or slow to respond, while the internal heater, wiring or electrical connector can also deteriorate.

This OE Match Lambda Oxygen Sensor provides a high-quality replacement for a confirmed faulty, contaminated or slow-response downstream sensor.

What This Product Does:

• Measures oxygen content in the exhaust gases.
• Operates AFTER the catalytic converter.
• Monitors exhaust conditions downstream of the catalyst.
• Sends oxygen-sensor information to the ECU.
• Helps monitor catalytic converter performance.
• Allows comparison with upstream lambda sensor readings.
• Supports onboard emissions diagnostics.
• Helps identify abnormal catalyst behaviour.
• Provides information used to detect emissions-system faults.
• Supports reliable exhaust-system monitoring.
• Helps the vehicle identify sensor and catalyst-related problems.
• Replaces a slow, contaminated or failed downstream sensor.
• Provides a Porsche replacement component for compatible applications.  

Symptoms Of Wear Or Failure:

• Check engine or engine-management warning light.
• Lambda sensor-related diagnostic fault codes.
• Downstream oxygen sensor fault codes.
• Catalyst-efficiency fault codes.
• Emissions-system warning messages.
• Slow sensor response during diagnostics.
• Implausible downstream oxygen readings.
• Sensor output remaining unusually fixed.
• Intermittent sensor signals.
• Vehicle failing an emissions test.
• Increased exhaust emissions.
• Oxygen sensor heater circuit faults.
• Open- or short-circuit fault codes.
• Damaged sensor wiring.
• Heat-damaged wiring insulation.
• Corroded electrical terminals.
• Damaged electrical connector.
• Physical damage to the sensor.  

Why Replacement Matters:

• The downstream oxygen sensor plays an important role in monitoring the vehicle's emissions-control system.
• If the sensor becomes slow, inaccurate or completely inoperative, the ECU may no longer receive dependable information about exhaust conditions after the catalytic converter.
• Replacing a confirmed faulty Lambda Oxygen Sensor restores reliable downstream exhaust feedback and helps the vehicle accurately assess catalytic converter operation.

Related reference numbers
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9A7906265E

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