Rear Axle Level Sensor. Porsche 991.1 / 991.2 2012-21  ❭  99133302104

Rear Axle Level Sensor.
Restore accurate rear suspension position monitoring and correct operation of associated vehicle systems with this Porsche Rear Axle Level Sensor, part number 99133302104. Designed for compatible Porsche applications, the level sensor monitors the position or movement of the rear axle/suspension relative to the vehicle body and supplies this information to the relevant electronic control systems.  

Fits:

• Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
• Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
• Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
• Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
• Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
• Porsche 991.1 R 4.0L (500 Bhp) 2016
• Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
• Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
• Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
• Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
• Porsche 991.2 Speedster 4.0L (510Bhp) 2019
• Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
• Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19  

Cars With Option Codes:
029 - Standard Chassis
601 - Xenon Lighting System
603 - Xenon Plus Dynamic Cornering Light
030 - Sports Suspension
031 - Sports Chassis With PASM And PDCC
352 - Electronic Damper Control For PASM And PDCC
475 - "PASM" Electronic Damper Control
477 - PASM W/O Lowering

Diagram Ref No 11

The sensor typically operates through a mechanical linkage connected to the suspension. As suspension height changes due to vehicle load, acceleration, braking or road conditions, the linkage moves the sensor through its operating range. The resulting signal allows applicable control modules to determine the vehicle's rear ride-height position.

Depending on vehicle specification, this information may be used by systems such as automatic headlamp levelling and suspension/ride-height control. Accurate level information allows these systems to compensate for changes in vehicle attitude and load.

Because of its location underneath the vehicle, the sensor and linkage are exposed to water, dirt, road salt, corrosion and physical movement. Over time, the linkage can seize or break, electrical connections can deteriorate, or the sensor itself can develop inaccurate or intermittent readings.

What This Product Does:

• Monitors rear suspension/axle position relative to the vehicle body.
• Detects changes in vehicle ride height.
• Converts suspension movement into an electrical signal.
• Sends position information to applicable vehicle control systems.
• Helps compensate for changes caused by passenger or luggage loads.
• Can support automatic headlamp levelling where equipped.
• Can provide information for applicable suspension control systems.
• Helps the vehicle determine changes in body attitude.
• Works through a mechanical linkage connected to the suspension.
• Supports correct operation of systems dependent on ride-height information.
• Replaces a damaged, seized, inaccurate or failed rear level sensor.
• Restores reliable rear axle position feedback when sensor failure is the cause.  

Symptoms Of Wear Or Failure:

• Suspension-related warning message.
• Headlamp levelling warning or fault.
• Automatic headlamp levelling not operating correctly.
• Headlamps pointing unusually high or low.
• Headlamp aim failing to compensate for vehicle load.
• Suspension or chassis warning light.
• Ride-height system behaving unexpectedly where applicable.
• Incorrect suspension-height information during diagnostics.
• Implausible level-sensor readings.
• Intermittent level-sensor signal.
• Sensor-related diagnostic fault codes.
• Broken or disconnected sensor linkage.
• Seized linkage joints.
• Bent linkage arm.
• Corrosion around the sensor or linkage.
• Damaged electrical connector.
• Damaged wiring near the rear suspension.
• Physical damage caused by road debris or previous suspension work.  

Why Replacement Matters:

• Modern Porsche systems rely on accurate sensor information to make automatic adjustments. If the rear axle level sensor sends an incorrect signal, the relevant control module may receive inaccurate information about the vehicle's suspension position.
• For vehicles equipped with automatic headlamp levelling, this can affect headlamp aim. A heavily loaded rear axle can change the angle of the vehicle body, potentially causing the headlights to point higher than intended. The levelling system uses suspension-position information to compensate for these changes.
• A faulty sensor can therefore contribute to headlights being aimed too high or too low. Incorrectly aimed headlights may reduce useful road illumination or create excessive glare for other road users.
• Where the sensor is also used by suspension or chassis systems, inaccurate ride-height information can interfere with the correct operation or diagnosis of those systems.
• Physical linkage problems are particularly important. A seized or broken linkage can prevent the sensor from following suspension movement even if the sensor electronics remain functional.
• Replacing a faulty Porsche Rear Axle Level Sensor 99133302104 helps restore reliable position feedback and allows associated systems to operate using accurate suspension-height information.

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