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Porsche > Panamera 971 MK1 (2017-2020) > 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20 > Exhausts >

Lambda Sensors / Probes

Lambda Sensors / Probes

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DISPLAYING 1 to 2 (of 2 products)
Lambda Oxygen Sensor, AFTER Catalytic Converter. Porsche 971.1 / 971.2 Panamera 2017-23 - 9A7906265E
2
Lambda Oxygen Sensor, AFTER Catalytic Converter. Porsche 971.1 / 971.2 Panamera 2017-23
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9A7906265E
Product Information
Product Information
Lambda Oxygen Sensor, AFTER Catalytic Converter.

Restore accurate exhaust monitoring and reliable emissions-system operation with this Porsche Lambda Oxygen Sensor, part number 9A7906265E. Designed for compatible Porsche applications, this sensor is installed AFTER the catalytic converter, where it monitors oxygen content 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 referred to as an oxygen sensor, O2 sensor or lambda probe, the downstream sensor provides the engine control unit (ECU) with information about exhaust conditions following catalytic treatment. This allows the vehicle's onboard diagnostic system to monitor catalytic converter performance and identify abnormalities within the emissions system.

The ECU can compare signals from oxygen sensors located before and after the catalytic converter. Differences between these readings help determine whether the catalyst is processing exhaust gases as expected.

Operating directly within the exhaust system exposes the sensor to extreme temperatures, vibration, moisture and combustion deposits. Repeated heating and cooling cycles can eventually cause the sensing element, heater circuit, wiring or electrical connections to deteriorate.

Replacing a confirmed faulty sensor with the correct Porsche Lambda Oxygen Sensor 9A7906265E helps restore dependable catalyst monitoring and accurate emissions-system diagnostics.

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 Porsche Lambda Oxygen Sensor 9A7906265E restores reliable downstream exhaust feedback and helps the vehicle accurately assess catalytic converter operation.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9A7906265E
9A7906265E

The product you are viewing cross references to these numbers
Lambda Oxygen Sensor, AFTER Catalytic Converter. Porsche 971.1 / 971.2 Panamera 2017-23 - 9A7906265E - 199193
2
Lambda Oxygen Sensor, AFTER Catalytic Converter. Porsche 971.1 / 971.2 Panamera 2017-23
9A7906265E/1
Product Information
Product Information
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
Related, superseded, cross reference or alternative numbers for comparison.

9A7906265E
9A7906265E

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
About Lambda Sensors / Probes

Lambda Sensors / Oxygen Probes | Precision Fuel Control & Emissions Performance

Lambda sensors (also known as oxygen sensors or O2 probes) are vital components in your Porsche’s exhaust and fuel management system. These precision sensors monitor the level of oxygen in the exhaust gases and send feedback to the engine control unit (ECU) to maintain the ideal air-fuel ratio. This ensures maximum performance, fuel efficiency, and reduced emissions — essential for both road and track use.

At Design911, we supply a wide range of high-quality replacement lambda sensors specifically designed for Porsche models, including 911, Cayman, Boxster, Panamera, and Macan. Each sensor is built to manufacturer-level standards, ensuring accurate data, fast response times, and long service life even under extreme exhaust temperatures.

Whether you’re performing a maintenance service or troubleshooting an emissions issue, our lambda sensors provide reliable performance and precise air-fuel monitoring to keep your Porsche running at its best.

What Do Lambda Sensors Do?

The lambda sensor continuously measures oxygen content in the exhaust gases, allowing the ECU to adjust the fuel injection and ignition timing. This feedback loop helps the engine maintain an optimal stoichiometric mixture (14.7:1 air to fuel), which is critical for performance, economy, and emissions control.

Core Functions:

  • Monitors exhaust oxygen levels to fine-tune combustion.
  • Supports optimal air-fuel ratio for maximum efficiency.
  • Ensures proper catalytic converter operation.
  • Reduces emissions and maintains environmental compliance.
  • Improves throttle response and fuel economy.

Without a functioning lambda sensor, your engine can run rich or lean — leading to poor performance, excessive fuel use, and potential catalytic converter damage.

Why Do Lambda Sensors Fail?

Lambda sensors operate in one of the harshest environments of the vehicle — exposed to extreme heat, soot, and contaminants. Over time, they wear out and lose accuracy.

Common Causes of Failure Include:

  • Carbon or oil contamination on the sensor element.
  • Thermal shock or excessive heat exposure.
  • Wiring or connector corrosion. Silicone or fuel additive residue buildup.
  • Normal sensor aging and loss of sensitivity.

When a lambda sensor fails, you may notice increased fuel consumption, rough idle, loss of power, or a check engine light — all indicators that replacement is needed.

Why Replace Your Lambda Sensor?

Replacing a worn or faulty lambda sensor restores proper fuel-air mixture control, protects the catalytic converter, and ensures compliance with emission standards.

Key Benefits:

  • Restores fuel efficiency and power delivery. Improves engine responsiveness and idle stability.
  • Reduces harmful emissions and prevents MOT failure.
  • Protects expensive exhaust components like catalytic converters.
  • Direct-fit compatibility for Porsche models.
  • Built from high-grade materials for extended lifespan.

Replacing your lambda sensor is an easy, cost-effective way to revive performance and reliability in your Porsche’s engine system.

Highlights:

  • High-quality oxygen probes and lambda sensors for Porsche.
  • Ensures accurate air-fuel ratio and clean combustion.
  • Compatible with Porsche 911, Cayman, Boxster, Macan, Panamera and others.
  • Corrosion-resistant housings and fast-reacting elements.
  • Essential for performance, emissions control, and fuel economy.
  • Direct-fit design ensures easy installation and reliable connection.

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