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Lambda Sensors / Probes
Fits:
Porsche Cayenne 955 V8 (AFTER catalyst)
Porsche Cayenne 955 Turbo (AFTER catalyst)
Function:
The Oxygen Sensor (also known as Lambda Sensor) is located in the exhaust manifold and measures the amount of unburned oxygen in your engine's exhaust. Based on the amount of oxygen, it sends a signal to your engine computer which then adjusts the air/fuel mixture for optimum engine performance and emission control.
Failure Symptoms:
Excessive fuel consumption, a faulty oxygen sensor can waste 30% of your fuel.
Driveability problems, such as engine surging or hesitation.
High hydrocarbon emissions, failing an emissions inspection.
The engine warning light may be on or service flag displayed.
The ecu/computer stores a mixture-related fault code.
When the oxygen sensor has stopped functioning completely, the catalytic converter may overheat and fail
Maintenance/Service:
Test and/or replace every 30,000 miles.
Perform periodic emission checks.
Watch for service light.
Vehicle manufacturers recommend periodic inspection and replacement of oxygen sensor.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95560613601
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
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12 Month Warranty
Worldwide Delivery
Express Delivery
Fits:
Porsche Cayenne 955 V8 (AFTER Catalytic converter)
Porsche Cayenne 955 Turbo (AFTER Catalytic converter)
Function:
The Oxygen Sensor (also known as Lambda Sensor) is located in the exhaust manifold and measures the amount of unburned oxygen in your engine's exhaust. Based on the amount of oxygen, it sends a signal to your engine computer which then adjusts the air/fuel mixture for optimum engine performance and emission control.
Failure Symptoms:
• Excessive fuel consumption, a faulty oxygen sensor can waste 30% of your fuel.
• Driveability problems, such as engine surging or hesitation.
• High hydrocarbon emissions, failing an emissions inspection.
• The engine warning light may be on or service flag displayed.
• The ecu/computer stores a mixture-related fault code.
• When the oxygen sensor has stopped functioning completely, the catalytic converter may overheat and fail
Maintenance / Service:
• Test and/or replace every 30,000 miles.
• Perform periodic emission checks.
• Watch for service light.
• Vehicle manufacturers recommend periodic inspection and replacement of oxygen sensor.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95560613601
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Free delivery
Fits:
Porsche Cayenne 955 V8 (AFTER Catalytic converter)
Porsche Cayenne 955 Turbo (AFTER Catalytic converter)
Function:
The Oxygen Sensor (also known as Lambda Sensor) is located in the exhaust manifold and measures the amount of unburned oxygen in your engine's exhaust. Based on the amount of oxygen, it sends a signal to your engine computer which then adjusts the air/fuel mixture for optimum engine performance and emission control.
Failure Symptoms:
• Excessive fuel consumption, a faulty oxygen sensor can waste 30% of your fuel.
• Driveability problems, such as engine surging or hesitation.
• High hydrocarbon emissions, failing an emissions inspection.
• The engine warning light may be on or service flag displayed.
• The ecu/computer stores a mixture-related fault code.
• When the oxygen sensor has stopped functioning completely, the catalytic converter may overheat and fail
Maintenance / Service:
• Test and/or replace every 30,000 miles.
• Perform periodic emission checks.
• Watch for service light.
• Vehicle manufacturers recommend periodic inspection and replacement of oxygen sensor.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95560613601
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Restore accurate air-fuel mixture monitoring and efficient engine-management operation with this OE Match Lambda Oxygen Sensor. Designed for compatible Porsche applications, this sensor is installed before the catalytic converter, where it monitors oxygen levels in the exhaust gases directly after combustion.
Fits:- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Diagram Ref No 6
Also known as an upstream, pre-cat or O2 sensor, the lambda sensor provides essential feedback to the engine control unit (ECU). By measuring the amount of oxygen remaining in the exhaust, the sensor enables the ECU to determine whether the engine is operating with a rich or lean air-fuel mixture and make the necessary fuel-delivery corrections.
Because this sensor operates upstream of the catalytic converter, it plays a particularly important role in closed-loop fuel control. Accurate readings contribute to efficient combustion, responsive engine performance, fuel economy and emissions control.
Continuous exposure to high exhaust temperatures, vibration and combustion deposits can cause lambda sensors to deteriorate over time. A worn sensor may become slow to respond, provide inaccurate readings or fail completely.
This OE Match Lambda Oxygen Sensor provides a high-quality replacement for a worn, contaminated or defective pre-catalytic converter sensor.
What This Product Does:
- Measures oxygen content within the exhaust gases.
- Is designed for installation before the catalytic converter.
- Sends exhaust oxygen information to the ECU.
- Helps determine whether the air-fuel mixture is rich or lean.
- Allows the ECU to continuously adjust fuel delivery.
- Supports accurate closed-loop fuel control.
- Helps maintain efficient combustion.
- Contributes to consistent throttle response and engine performance.
- Helps optimise fuel consumption.
- Supports correct exhaust emissions.
- Helps protect the catalytic converter from problems caused by incorrect fuelling.
- Replaces a slow, contaminated, damaged or failed oxygen sensor.
- Provides an OE Match replacement for compatible Porsche applications.
Symptoms Of Wear Or Failure:
- Check engine or engine-management warning light.
- Lambda or oxygen sensor-related diagnostic fault codes.
- Rich or lean mixture fault codes. Increased fuel consumption.
- Rough or unstable idle. Engine hesitation or stumbling.
- Poor throttle response. Reduced engine performance.
- Engine running excessively rich or lean.
- Strong fuel smell from the exhaust.
- Increased exhaust emissions.
- Failed emissions testing where applicable.
- Intermittent engine-management faults.
- Slow sensor response visible through diagnostic equipment.
- Implausible or inconsistent oxygen sensor readings.
- Sensor heater circuit faults where applicable.
- Damaged wiring or electrical connectors.
Why Replacement Matters:
- The pre-catalytic converter lambda sensor is one of the engine-management system's primary tools for controlling the air-fuel mixture.
- When operating correctly, the sensor provides rapid feedback that allows the ECU to continually adjust fuel delivery according to actual combustion conditions. If the sensor becomes slow or inaccurate, these adjustments may no longer be as precise.
- Poor mixture control can result in increased fuel consumption, reduced performance and higher emissions. In some cases, the engine may continue to operate relatively normally while efficiency gradually deteriorates.
- Incorrect fuelling can also place the catalytic converter at risk. An excessively rich mixture may allow unburned fuel to enter the exhaust system, increasing catalyst temperatures and potentially contributing to premature catalytic converter damage.
- A completely failed sensor may cause the ECU to use substitute values or a more conservative operating strategy, potentially illuminating the engine-management warning light and reducing overall efficiency.
- Replacing a defective sensor with this OE Match Lambda Oxygen Sensor helps restore accurate mixture feedback, efficient combustion and dependable engine-management operation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958906262L
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche Cayenne 955 Turbo (BEFORE Catalytic converter)
Function:
The Oxygen Sensor (also known as Lambda Sensor) is located in the exhaust manifold and measures the amount of unburned oxygen in your engine's exhaust. Based on the amount of oxygen, it sends a signal to your engine computer which then adjusts the air/fuel mixture for optimum engine performance and emission control.
Failure Symptoms:
• Excessive fuel consumption, a faulty oxygen sensor can waste 30% of your fuel.
• Driveability problems, such as engine surging or hesitation.
• High hydrocarbon emissions, failing an emissions inspection.
• The engine warning light may be on or service flag displayed.
• The ecu/computer stores a mixture-related fault code.
• When the oxygen sensor has stopped functioning completely, the catalytic converter may overheat and fail
Maintenance / Service:
• Test and/or replace every 30,000 miles.
• Perform periodic emission checks.
• Watch for service light.
• Vehicle manufacturers recommend periodic inspection and replacement of oxygen sensor.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958906262L
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Free delivery
Fits:
Porsche Cayenne 955 Turbo (BEFORE Catalytic converter)
Function:
The Oxygen Sensor (also known as Lambda Sensor) is located in the exhaust manifold and measures the amount of unburned oxygen in your engine's exhaust. Based on the amount of oxygen, it sends a signal to your engine computer which then adjusts the air/fuel mixture for optimum engine performance and emission control.
Failure Symptoms:
• Excessive fuel consumption, a faulty oxygen sensor can waste 30% of your fuel.
• Driveability problems, such as engine surging or hesitation.
• High hydrocarbon emissions, failing an emissions inspection.
• The engine warning light may be on or service flag displayed.
• The ecu/computer stores a mixture-related fault code.
• When the oxygen sensor has stopped functioning completely, the catalytic converter may overheat and fail
Maintenance / Service:
• Test and/or replace every 30,000 miles.
• Perform periodic emission checks.
• Watch for service light.
• Vehicle manufacturers recommend periodic inspection and replacement of oxygen sensor.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958906262L
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Express Delivery
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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