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Lambda Sensors / Probes
By OE Match
- 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>>
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Related, superseded, cross reference or alternative numbers for comparison.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
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 and is positioned BEFORE the catalytic converter.
Fits:
- Porsche 955 Cayenne S 4.5L V8 2003-06
Diagram Ref No 6
Also known as an O2 sensor, oxygen sensor or lambda probe, this component measures the oxygen content remaining in the exhaust gases leaving the engine. The sensor sends this information to the engine control unit (ECU), allowing the engine-management system to determine whether combustion is operating richer or leaner than intended.
Because this is a pre-catalyst / upstream sensor, its readings play an important role in fuel-mixture management. The ECU can use the sensor's feedback to adjust fuel delivery, helping maintain efficient combustion, consistent engine performance, controlled emissions and effective catalytic converter operation.
Lambda sensors operate directly in the hot exhaust stream and are exposed to extreme temperatures, vibration, moisture, combustion deposits and repeated thermal cycling. With age, the sensing element can become contaminated or slow to respond, while the internal heater, wiring and electrical connector can also deteriorate.
This OE Match LEFT Lambda Oxygen Sensor provides a high-quality replacement for a confirmed faulty, contaminated or slow-response sensor.
What This Product Does:
- Measures oxygen content in the exhaust gases.
- Fits the LEFT-side exhaust bank where specified.
- Operates BEFORE the catalytic converter.
- Sends exhaust-mixture information to the ECU.
- Helps determine whether the engine is running 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 and consistent engine performance.
- Helps maintain responsive acceleration.
- Contributes to efficient fuel consumption.
- Helps control exhaust emissions.
- Supports efficient catalytic converter operation.
- Provides important information for engine diagnostics.
- Replaces a slow, inaccurate, contaminated or failed 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 fault codes.
- Left-bank lambda sensor faults.
- Rich or lean mixture diagnostic codes.
- Increased fuel consumption.
- Rough or unstable idle.
- Engine hesitation.
- Poor throttle response.
- Reduced engine performance.
- Inconsistent power delivery.
- 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 signals.
- Oxygen sensor heater circuit faults.
- Heat-damaged wiring.
- Corroded or damaged electrical connectors.
Why Replacement Matters:
- The before-catalyst lambda sensor is an important part of the engine's fuel-management system.
- Once the appropriate operating conditions are reached, the ECU can use lambda feedback to continually refine fuel delivery. The sensor must respond accurately as engine speed, load and operating conditions change.
- A worn sensor may continue producing an electrical signal while becoming progressively slower or less accurate.
- Replacing a confirmed faulty OE Match LEFT Lambda Oxygen Sensor helps restore accurate mixture feedback and allows the ECU to manage fuelling correctly.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94860612903
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
