transmission

Transmission Speed Sensor - Output

for 2017 Maserati Levante 3.0L V6 Twin Turbo · RWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Lexus & Toyota Mechanic · 20+ years

Difficulty

Moderate

Time

1.8 h

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

Replace the output speed sensor on the ZF 8-speed automatic transmission to restore proper speedometer operation and transmission shift quality.

Warnings

⚠Transmission fluid may be hot if vehicle was recently driven. Allow 30 minutes cooling time.

⚠The output speed sensor is located on the transmission housing and will release approximately 0.5-1.0 quarts of fluid when removed.

ℹ️Clearing fault codes requires a Maserati-compatible scan tool after repair.

⚠️Ensure vehicle is securely supported on jack stands before working underneath. Do not rely on jack alone.

Tools required

Vehicle lift or jack standsEssential

Metric socket set (8mm-19mm)Essential

Torque wrench (5-50 Nm range)Essential

Oil drain pan (2 quart minimum)Essential

Trim removal tools

Work lightEssential

Nitrile gloves

Funnel with long flexible spoutEssential

Fluid transfer pump

Parts

Transmission output speed sensor × 1 — Use OEM specification
Output speed sensor O-ring × 1 — Usually included with sensor
ZF Lifeguard 8 transmission fluid × 1 — S671090255 or equivalent

Fluids

ZF Lifeguard 8 — 1 qt

Preparation

Park vehicle on level surface and engage parking brake
Ensure transmission is in PARK position
Raise vehicle on lift or jack stands to working height
Remove engine undertray and transmission splash shields if equipped
Allow transmission to cool if vehicle was recently driven

Procedure

1
Locate the output speed sensor
From underneath the vehicle, locate the output speed sensor on the driver side of the transmission housing near the output shaft. The sensor is identified by its electrical connector and single mounting bolt. It is positioned approximately mid-way along the transmission case.
2
Disconnect the electrical connector
Press the locking tab on the electrical connector and carefully pull the connector away from the output speed sensor. Ensure the connector is positioned away from the work area to prevent fluid contamination.
3
Position drain pan
Place the drain pan directly below the output speed sensor. Position it to capture fluid that will drain when the sensor is removed, accounting for approximately 0.5-1.0 quarts of ZF Lifeguard 8 fluid.
4
Remove sensor mounting bolt
Using the appropriate metric socket, remove the single bolt securing the output speed sensor to the transmission case. Keep the bolt clean for reinstallation.
Torque spec
Sensor Bolts11 Nm (8 lb-ft)
5
Extract the output speed sensor
Carefully pull the sensor straight out from the transmission case. Expect transmission fluid to drain as the sensor is removed. Allow fluid to fully drain into the pan. Inspect the sensor for debris or metal particles on the magnetic tip.
6
Inspect and clean the sensor bore
Examine the sensor mounting bore in the transmission case for debris, metal shavings, or damage. Use a clean lint-free shop towel to carefully clean the sealing surface. Do not allow any debris to enter the transmission.
7
Prepare the new sensor
Remove the new output speed sensor from packaging. Verify the new O-ring is properly seated in the sensor groove. Lightly lubricate the O-ring with clean ZF Lifeguard 8 fluid to ease installation and prevent damage.
8
Install the new sensor
Carefully insert the new output speed sensor into the transmission case bore, ensuring proper alignment. Push firmly until the sensor is fully seated and the mounting hole aligns. Do not force or cross-thread.
Torque spec
Sensor Bolts11 Nm (8 lb-ft)
9
Secure the sensor
Install the sensor mounting bolt and hand-tighten. Using a calibrated torque wrench, torque the bolt to specification. Ensure the sensor body does not rotate during tightening.
Torque spec
Sensor Bolts11 Nm (8 lb-ft)
10
Reconnect electrical connector
Reconnect the electrical connector to the output speed sensor, ensuring it clicks into place. Verify the locking tab is fully engaged and the connection is secure.
11
Refill transmission fluid
Access the transmission fill plug on the passenger side of the transmission case. Remove the fill plug and using a fluid pump or funnel with flexible spout, add approximately 1.0 quart of ZF Lifeguard 8 fluid to replace what was lost. Fluid should reach the bottom of the fill plug hole when at operating temperature.
Torque spec
Fill Plug35 Nm (26 lb-ft)
12
Reinstall underbody panels
Reinstall all transmission splash shields and engine undertray components removed during preparation. Ensure all fasteners are properly secured.

Reassembly

Lower vehicle to ground when all work is complete
Start engine and allow to idle for 2-3 minutes
Cycle transmission through all gear positions (P-R-N-D-Manual modes) while stationary
Check transmission fluid level at operating temperature (176°F/80°C) with engine running
Top off fluid as necessary to maintain proper level at fill plug

Verification

Use Maserati-compatible diagnostic scan tool to clear any stored transmission fault codes
Verify output speed sensor signal is being received by the transmission control module
Test drive vehicle and confirm speedometer operates correctly
Verify smooth transmission shifting through all gears under normal driving conditions
Recheck transmission fluid level after test drive and top off if necessary
Inspect sensor area for any fluid leaks after test drive

🔧Stuck on this transmission speed sensor - output? Take it to The Diag Desk.A human with 20+ years in the bay answers about YOUR Maserati within 24 hours — never AI. $25, and you're not charged unless you get an answer.Ask a tech →