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Lambda Sensors / Probes
By OE Match
- 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Related, superseded, cross reference or alternative numbers for comparison.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
Restore accurate air-fuel mixture monitoring and dependable engine-management operation with this OE Match LEFT Lambda Oxygen Sensor. Designed for compatible Porsche applications, this sensor is specified for the LEFT side, cylinders 4–6, and is positioned BEFORE the catalytic converter.
Fits:- Porsche 955 Cayenne 3.2L V6 2004-06
Diagram Ref No 27
Also known as an oxygen sensor, O2 sensor or lambda probe, this component measures the oxygen content of the exhaust gases leaving the engine. As a pre-catalyst sensor, its readings provide the engine control unit (ECU) with important information about the combustion mixture before the exhaust gases enter the catalytic converter.
The ECU uses this information to determine whether the engine is operating richer or leaner than intended and can make appropriate adjustments to fuel delivery. Accurate lambda feedback helps maintain efficient combustion, smooth engine performance, controlled emissions and correct catalytic converter operation.
Located directly in the hot exhaust stream, lambda sensors endure high temperatures, vibration, thermal cycling and combustion deposits. With age, the sensing element can become contaminated or slow to respond, while the internal heater, wiring or electrical connections may also deteriorate.
This OE Match LEFT Lambda Oxygen Sensor provides a high-quality replacement for a slow, inaccurate, contaminated or failed sensor on the cylinders 4–6 bank.
What This Product Does:
- Measures oxygen content in the exhaust gases.
- Fits the LEFT-side exhaust bank where specified.
- Serves cylinders 4–6.
- Is positioned BEFORE the catalytic converter.
- Sends exhaust-mixture information to the ECU.
- Helps determine whether combustion is rich or lean.
- Supports closed-loop fuel control.
- Allows the ECU to make appropriate fuel corrections.
- Helps maintain the intended air-fuel mixture.
- Supports smooth idle and consistent engine performance.
- Helps maintain responsive acceleration.
- Contributes to efficient fuel consumption.
- Helps control exhaust emissions.
- Supports efficient catalytic converter operation.
- Replaces a faulty or slow-response pre-catalyst sensor.
- Provides an OE Match replacement for compatible Porsche applications.
- Check engine or engine-management warning light.
- Lambda or oxygen sensor fault codes.
- Bank-specific oxygen sensor faults for cylinders 4–6.
- Rich or lean mixture fault codes.
- Sensor heater circuit faults.
- Increased fuel consumption.
- Rough or unstable idle.
- Engine hesitation.
- Poor throttle response.
- Reduced engine performance.
- Uneven engine operation.
- Engine misfires.
- Difficult starting.
- Increased exhaust emissions.
- Failed emissions test.
- Strong fuel smell from the exhaust.
- Slow lambda sensor response during diagnostics.
- Implausible oxygen sensor readings.
- Intermittent sensor signal.
- Heat-damaged sensor wiring.
- Damaged or corroded electrical connector.
Why Replacement Matters:
- The before-catalyst lambda sensor is an important part of the engine's fuel-management system.
- When operating in closed-loop control, the ECU uses lambda sensor information to continually refine fuel delivery. If the sensor reports inaccurate information or responds too slowly, the ECU may make inappropriate fuel corrections.
- A lambda sensor does not necessarily stop working completely when worn. It may instead become progressively slower or less accurate, which can make deterioration harder to identify without diagnostic testing.
- Replacing a confirmed faulty OE Match Lambda Oxygen Sensor helps restore accurate mixture feedback for the cylinders 4–6 bank and allows the engine-management system to control fuelling correctly.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958906262C
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne 3.2L V6 2003-06
Restore accurate air-fuel mixture monitoring and dependable engine-management performance with this OE Match Right Lambda Oxygen Sensor. Designed for compatible Porsche applications, this sensor is specified for the RIGHT side, BEFORE the catalytic converter.
Fits:- Porsche 955 Cayenne 3.2L V6 2004-06
Diagram Ref No 26
Also known as an upstream, pre-cat or O2 sensor, the lambda sensor measures the oxygen content remaining in the exhaust gases immediately after combustion. It sends this information to the engine control unit (ECU), allowing the ECU to determine whether the engine is operating with a rich or lean air-fuel mixture and adjust fuel delivery accordingly.
Because this sensor is located before the catalyst, it plays an important role in closed-loop fuel control. Accurate readings help maintain efficient combustion, responsive engine performance, appropriate fuel consumption and controlled exhaust emissions.
Lambda sensors operate in an extremely demanding environment and are continually exposed to high exhaust temperatures, vibration and combustion deposits. With age, the sensing element may become contaminated or slow to respond, while the internal heater circuit, wiring or connector can also deteriorate.
This OE Match Right Lambda Oxygen Sensor provides a high-quality replacement for a worn, contaminated, damaged or failed original sensor.
What This Product Does:
- Is specified for the RIGHT-side application.
- Is positioned BEFORE the catalytic converter.
- Measures oxygen content in the exhaust gases.
- Sends exhaust oxygen information to the ECU.
- Helps determine whether the engine is running rich or lean.
- Allows continuous adjustment of fuel delivery.
- Supports accurate closed-loop mixture control.
- Helps maintain efficient combustion.
- Supports responsive acceleration and smooth engine operation.
- Helps optimise fuel consumption.
- Contributes to correct exhaust emissions.
- Helps protect the catalytic converter from problems associated with incorrect fuelling.
- Replaces a slow, contaminated, damaged or failed oxygen sensor.
- Provides an OE Match alternative for compatible Porsche applications.
- Check engine or engine-management warning light.
- Lambda or oxygen sensor-related diagnostic codes.
- Bank-specific rich or lean mixture faults.
- 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 sensor response during diagnostic testing.
- Implausible or inconsistent lambda readings.
- Oxygen sensor heater circuit faults.
- Damaged wiring, insulation or electrical connectors.
Why Replacement Matters:
- The pre-catalytic converter lambda sensor is a key feedback component within the engine-management system. The ECU relies on its signal to make continual adjustments to fuel delivery as engine speed, load and operating conditions change.
- As a lambda sensor deteriorates, it can become slower or less accurate without immediately failing completely. This may result in less precise mixture control and contribute to higher fuel consumption, reduced performance, unstable running and increased emissions.
- Incorrect fuelling can also affect the catalytic converter. An excessively rich mixture may allow unburned fuel to enter the exhaust system, potentially increasing catalyst temperatures and accelerating deterioration.
- If the sensor fails completely, the ECU may substitute calculated values or adopt a fallback strategy. The vehicle may remain driveable, but performance, fuel economy and emissions can be compromised.
- Because this sensor is specified for the right-side pre-catalyst position, correct identification is especially important on engines equipped with multiple exhaust banks and lambda sensors.
- Replacing a defective component with this OE Match Right Lambda Oxygen Sensor helps restore accurate mixture feedback, efficient combustion and dependable engine-management performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958906262B
The product you are viewing cross references to these numbers
OEMatch Lambda Sensors / Probes — Fit, Function, Confidence
OEMatch Lambda Sensors / Probes components are compatible replacements engineered to original-spec dimensions and tolerances — a practical option when genuine or OEM parts are unavailable. Lambda sensors measure oxygen in exhaust gases and report to the engine control unit so fuel injection and ignition are adjusted for correct combustion in Porsche models, helping to maintain efficient running and emissions control.
Available Types
- Narrowband heated zirconia sensors for stoichiometric control
- Wideband (UEGO) sensors for precise air-fuel ratio feedback
- Pre-catalyst and post-catalyst probes for exhaust monitoring
Understanding OEMatch Lambda Sensors / Probes
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original lambda sensors / probes.
OE (Original Equipment) refers to parts matching original specifications for the lambda sensors / probes and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM lambda sensors / probes engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Lambda sensors detect oxygen content in exhaust gases and provide a feedback signal used by the ECU to regulate fuel delivery and maintain correct combustion. Sensor designs vary by application; heated elements assist rapid warm-up, while wideband units offer greater resolution for tuning and diagnostics. Correct sensor operation supports catalytic converter efficiency and engine management across a range of Porsche engines.
Benefits Include
- Restores accurate air-fuel control for stable idle and part-throttle response
- Helps reduce emissions and supports catalytic converter protection
- Improves fuel economy by enabling correct mixture control
Why Lambda Sensors / Probes Wear and Fail
- Contamination of the sensing element by oil, coolant or deposits
- Thermal cycling and element degradation from repeated extreme temperatures
- Wiring damage, connector corrosion or poor electrical contact
The Importance of Replacing with OEMatch Lambda Sensors / Probes
Replacing a degraded sensor restores reliable feedback to the ECU, reduces the risk of poor combustion or catalytic converter damage and helps keep emissions within expected limits for Porsche models. OEMatch supplies sensors chosen for compatibility with Porsche mounting and electrical interfaces to simplify replacement while supporting accurate air-fuel control.
Advantages
- Direct-fit options that match factory mounting points and electrical connections
- Available with heated elements or wideband sensing for specific applications
- Corrosion-resistant housings and common connector types for straightforward installation
