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- Porsche 996 TURBO 2000-05
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.
Fits:
Porsche 996 Turbo (BEFORE Catalytic converter)
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Related, superseded, cross reference or alternative numbers for comparison.
99660612801
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
The OE MATCH Lambda Sensor, After Catalytic Converter is a critical emissions control and engine management component designed to monitor the oxygen content of exhaust gases after they have passed through the catalytic converter. Also known as a post-catalyst oxygen sensor, it provides feedback to the engine control unit (ECU) regarding catalytic converter efficiency and overall emissions system performance.
Sold Each.
x2 Required Per Car.
Fits:
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Diagram Ref No 21
This OE MATCH lambda sensor helps ensure the vehicle meets emissions standards while allowing the ECU to continuously monitor and optimise engine operation. By accurately measuring oxygen levels in the exhaust stream, it supports efficient emissions control and helps identify catalytic converter performance issues before they become more serious.
What This Product Does:
- Monitors oxygen levels in exhaust gases after the catalytic converter
- Measures catalytic converter efficiency and performance
- Provides real-time feedback to the engine control unit (ECU)
- Supports emissions control system monitoring
- Helps maintain compliance with emissions regulations
- Assists the ECU in diagnosing exhaust and catalyst-related faults
Symptoms Of Wear Or Failure:
- Check engine light illumination
- Catalytic converter efficiency fault codes
- Failed emissions or MOT tests
- Increased exhaust emissions
- Reduced fuel economy in some cases
- Engine management warning messages
- Oxygen sensor-related fault codes
- Incorrect catalytic converter monitoring data
Why Replacement Matters:
- Restores accurate exhaust oxygen monitoring
- Ensures proper catalytic converter efficiency monitoring
- Helps maintain emissions compliance and MOT readiness
- Prevents persistent engine management warning lights
- Supports efficient engine management system operation
- Allows accurate diagnosis of catalyst and exhaust system performance
- Reduces the risk of increased emissions and environmental impact
- Maintains long-term reliability of the emissions control system
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958906262Q
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Restore accurate air-fuel mixture monitoring and dependable 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 measures the oxygen content of the exhaust gases leaving the engine.
Fits:
- Porsche 957 Cayenne S 4.8L 2007-10
Diagram Ref No 6
Also known as an upstream, pre-cat or O2 sensor, the lambda sensor provides critical feedback to the engine control unit (ECU). By monitoring residual oxygen in the exhaust stream, it allows the ECU to determine whether the engine is running richer or leaner than intended and make continuous adjustments to fuel delivery.
Accurate pre-catalyst lambda sensor information is important for maintaining efficient combustion, responsive performance, fuel economy and emissions control. Unlike a downstream sensor, which is commonly used to monitor catalytic converter performance, the before-catalytic-converter sensor has a direct role in fuel-mixture regulation.
Lambda sensors operate in an extremely demanding environment and are continually exposed to high exhaust temperatures and combustion by-products. Age, contamination, wiring damage or deterioration of the sensing element can eventually cause slow, inaccurate or failed readings.
This OE Match Lambda Oxygen Sensor provides a high-quality replacement for a worn or defective pre-cat sensor, helping restore accurate mixture feedback and correct engine-management operation.
What This Product Does:
- Measures oxygen content in the exhaust gases.
- Is positioned before the catalytic converter.
- Provides air-fuel mixture feedback to the ECU.
- Helps the ECU determine whether combustion is rich or lean.
- Allows continuous adjustment of fuel delivery.
- Supports accurate closed-loop fuel control.
- Helps maintain efficient combustion.
- Contributes to consistent engine performance and throttle response.
- Helps optimise fuel consumption.
- Supports correct operation of the emissions-control system.
- Helps protect the catalytic converter from problems associated with 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.
- Oxygen sensor or mixture-related diagnostic fault codes.
- Increased fuel consumption.
- Rough or unstable idle.
- Engine hesitation. Poor throttle response.
- Reduced engine performance.
- Engine running excessively rich.
- Engine running excessively lean.
- Increased exhaust emissions.
- Strong fuel smell from the exhaust.
- Failed emissions testing where applicable.
- Intermittent engine-management faults.
- Slow or implausible lambda sensor readings during diagnostic testing.
- Damaged sensor wiring or electrical connector.
- Heater circuit-related sensor faults where applicable.
Why Replacement Matters:
- The pre-catalytic converter lambda sensor is a key feedback device for the engine's fuel-management system. When operating correctly, it allows the ECU to continually fine-tune the air-fuel mixture as driving conditions change.
- As a lambda sensor ages, its response can become slower even before it fails completely. Delayed or inaccurate feedback may cause the ECU to make less precise fuelling corrections, potentially resulting in increased fuel consumption, reduced performance and higher emissions.
- Incorrect fuelling can also affect the catalytic converter. An excessively rich mixture may allow unburned fuel to enter the exhaust, potentially causing the catalyst to operate at abnormally high temperatures. Persistent lean-running conditions can also contribute to poor engine operation and increased combustion temperatures.
- A failed sensor may cause the ECU to rely on substitute values or an alternative control strategy. While the vehicle may continue to operate, performance, efficiency and emissions can be compromised.
- Replacing a defective component with this OE Match Pre-Catalytic Converter 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.
94860613102
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
The OE MATCH Lambda Oxygen Sensor is an exhaust-gas sensor designed for installation before the catalytic converter, also known as the pre-cat or upstream position.
Fits:
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Diagram Ref No 7
The sensor measures the oxygen content of the exhaust gases leaving the engine and sends this information to the engine control unit (ECU). The ECU uses this feedback as part of its engine-management strategy to maintain the correct air/fuel mixture and efficient combustion.
What This Product Does:
The lambda sensor continuously measures the amount of oxygen remaining in the exhaust gases.
This information allows the ECU to determine whether the engine is operating with a mixture that is relatively rich or lean. The ECU can then make appropriate adjustments to fuel delivery to maintain efficient combustion under applicable operating conditions.
A correctly functioning pre-cat oxygen sensor helps:
- Monitor the engine's air/fuel mixture
- Provide exhaust oxygen information to the ECU
- Support accurate fuel-control adjustments
- Promote efficient combustion
- Maintain responsive engine operation
- Support good fuel economy
- Reduce unnecessary exhaust emissions
- Help protect catalytic converter performance
Symptoms Of Wear Or Failure:
Lambda sensors operate in an extremely demanding environment and are continually exposed to hot exhaust gases, combustion deposits and repeated temperature cycles.
As a sensor ages, its response can become slower or its readings can become inaccurate.
Common symptoms of a worn or failing pre-cat oxygen sensor can include:
- Check Engine Light / engine-management warning
- Lambda or oxygen-sensor fault codes
- Rich or lean mixture fault codes
- Increased fuel consumption
- Poor fuel economy
- Rough or inconsistent idle
- Hesitation during acceleration
- Reduced engine response
- Increased exhaust emissions
- Failed emissions test
- Irregular engine operation
- Incorrect or slow sensor readings during diagnostics
- Damaged wiring or electrical connectors
The exact symptoms depend on the nature of the failure and the vehicle's engine-management strategy.
Why Replacement Matters:
The ECU depends on accurate information from the pre-cat lambda sensor to help manage combustion effectively.
If the sensor becomes slow or inaccurate, the ECU may receive incorrect information about the oxygen content of the exhaust gases. This can affect fuel control and potentially lead to poor engine operation, increased fuel consumption and higher emissions.
Replacing a confirmed defective sensor can help restore:
- Accurate air/fuel mixture feedback
- Correct engine-management operation
- Efficient fuel delivery
- Smoother engine performance
- Improved fuel economy where the failed sensor was causing excessive consumption
- Correct emissions monitoring
- Reduced risk of recurring lambda-related fault codes
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95560616802
The product you are viewing cross references to these numbers