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- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
The Lambda Sensor, Before Catalytic Converter is a precision-engineered engine management and emissions control sensor designed to monitor oxygen levels in the exhaust gases before they enter the catalytic converter on the left-hand exhaust bank. Also known as an upstream oxygen sensor or pre-catalyst lambda sensor, it plays a crucial role in maintaining the correct air-fuel mixture for efficient combustion and optimal engine performance.
Fits:
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
Diagram Ref No 7
The sensor continuously measures the oxygen content in the exhaust stream and sends real-time data to the engine control unit (ECU). Using this information, the ECU adjusts fuel injection and ignition parameters to maximise fuel efficiency, reduce emissions, and ensure smooth engine operation. Manufactured to OEM specifications, this sensor delivers accurate readings, fast response times, and long-term reliability.
What This Product Does:
- Monitors oxygen levels in exhaust gases before the catalytic converter
- Provides real-time feedback to the engine control unit (ECU)
- Helps regulate the air-fuel mixture for efficient combustion
- Supports engine performance and throttle response
- Improves fuel economy and emissions control
- Ensures efficient catalytic converter operation
Symptoms Of Wear Or Failure:
- Check engine light illumination
- Poor fuel economy
- Rough idle or unstable engine operation
- Reduced engine power and acceleration
- Engine hesitation or sluggish throttle response
- Increased exhaust emissions
- Failed emissions or MOT tests
- Oxygen sensor-related fault codes stored in the ECU
Why Replacement Matters:
- Restores accurate air-fuel ratio monitoring
- Improves fuel economy and combustion efficiency
- Enhances engine performance and throttle response
- Reduces harmful exhaust emissions
- Supports proper catalytic converter function and longevity
- Prevents unnecessary engine management warning lights
- Helps maintain emissions compliance and MOT readiness
- Ensures reliable communication between the sensor and ECU for optimum engine operation
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94860613
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne 3.2L V6 2003-06
Fits:
Porsche Cayenne 955 V6 3.2L (before 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.
958906262
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne 3.2L V6 2003-06
Fits:
Porsche Cayenne 955 V6 3.2L (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.
95560613610
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne 3.2L V6 2003-06
Fits:
Porsche Cayenne 955 V6 3.2L (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.
955606136
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne 3.2L V6 2003-06
Maintain accurate air-fuel mixture monitoring, efficient combustion and dependable engine-management performance with this Porsche Lambda Oxygen Sensor, part numbers 958906262C and 958906262B. Designed for compatible Porsche applications, this sensor is positioned BEFORE the catalytic converter, where it monitors oxygen levels in the exhaust gases immediately after combustion.
Fits:
- Porsche 955 Cayenne 3.2L V6 2004-06
Diagram Ref No 26 And 27
Also known as an upstream, pre-cat or O2 sensor, the lambda sensor provides critical feedback to the engine control unit (ECU). By measuring residual oxygen in the exhaust stream, it enables the ECU to determine whether the engine is operating with a rich or lean air-fuel mixture and make continuous adjustments to fuel delivery.
Because this sensor is positioned upstream of the catalyst, it plays an important role in closed-loop fuel control. Accurate readings help maintain the correct air-fuel mixture for engine performance, fuel efficiency and emissions control.
Lambda sensors operate in an extremely demanding environment and are continuously exposed to high exhaust temperatures, vibration and combustion deposits. Over time, the sensing element can become contaminated or slow to respond, while the internal heater circuit, wiring or electrical connections may also deteriorate.
Replacing a faulty unit with the correct Porsche Lambda Oxygen Sensor 958906262C / 958906262B helps restore accurate exhaust monitoring and proper engine-management operation.
What This Product Does:
- Is designed for installation BEFORE the catalytic converter.
- Measures oxygen content within the exhaust gases.
- Sends exhaust oxygen information to the ECU.
- Helps determine whether the engine is running rich or lean.
- Allows the ECU to continually adjust fuel delivery.
- Supports accurate closed-loop air-fuel mixture control.
- Helps maintain efficient combustion.
- Supports smooth and responsive engine performance.
- Helps optimise fuel consumption.
- Contributes to correct exhaust emissions.
- Helps the ECU adapt fuelling to changing operating conditions.
- Helps protect the catalytic converter from problems associated with incorrect fuelling.
- Replaces a worn, contaminated, slow or failed lambda sensor.
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. Hesitation during acceleration.
- 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 warnings.
- Slow lambda sensor response during diagnostic testing.
- Implausible or inconsistent oxygen sensor readings.
- Sensor heater circuit-related faults.
- Damaged sensor wiring or electrical connectors.
Why Replacement Matters:
- The lambda sensor positioned before the catalytic converter is a key component of the engine's fuel-management system. The ECU relies on its signal to continually fine-tune fuel delivery according to actual combustion conditions.
- As a lambda sensor ages, its response can become progressively slower or less accurate without immediately failing completely. This can cause less precise fuel corrections and may contribute to increased fuel consumption, reduced performance, unstable running and higher emissions.
- Incorrect fuelling can also affect the catalytic converter. An excessively rich mixture may allow unburned fuel to enter the exhaust, increasing catalyst temperatures and potentially shortening catalytic converter service life.
- A failed sensor can cause the ECU to use substitute values or an alternative operating strategy. Although the engine may continue to run, overall efficiency, performance and emissions can be compromised.
- A malfunctioning lambda sensor can also trigger persistent engine-management warnings and make diagnosis of other fuel or emissions-related problems more difficult.
- Replacing a defective sensor with the correct Porsche Lambda Oxygen Sensor 958906262C / 958906262B helps restore accurate mixture feedback, efficient combustion and dependable engine-management performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958906262
The product you are viewing cross references to these numbers