emissions

Oxygen Sensor Replacement

for 2017 Maserati Levante 3.0L V6 Twin Turbo · RWD

Difficulty

Moderate

Time

2.2 h

Tools

Steps

Replace one or more oxygen sensors in the exhaust system of a 2017 Maserati Levante 3.0L V6 Twin Turbo to restore proper air-fuel mixture monitoring and eliminate check engine lights related to O2 sensor faults.

Warnings

⚠️Exhaust system remains extremely hot for 30+ minutes after engine shutdown. Allow complete cooling before starting work to avoid severe burns.

⚠Oxygen sensor threads can seize in the exhaust manifold or catalytic converter. Do not force removal as this may damage expensive exhaust components.

⚠Never apply anti-seize to sensor tip or use silicone-based products which will contaminate the sensor element.

ℹ️The V6 Twin Turbo has four oxygen sensors total: two upstream (pre-cat) and two downstream (post-cat), one set per bank. Identify which sensor requires replacement using diagnostic codes.

Tools required

Oxygen sensor socket (7/8" or 22mm)Essential

Ratchet with extension setEssential

Penetrating oil (PB Blaster or equivalent)

Wire brush

Anti-seize compound (nickel-based)Essential

OBD-II scannerEssential

Jack and jack stands rated for vehicle weightEssential

Wheel chocksEssential

Torque wrench

Heat gun or propane torch

Trim panel removal tools

Socket set (10mm, 13mm)Essential

Parts

Upstream oxygen sensor (Bank 1 or Bank 2) × 1 — Use OEM Maserati specification or Bosch 17014
Downstream oxygen sensor (Bank 1 or Bank 2) × 1 — Use OEM Maserati specification or Bosch 13893

Preparation

Use OBD-II scanner to read diagnostic trouble codes and identify which oxygen sensor(s) require replacement (P0131-P0141 range codes)
Ensure engine and exhaust system are completely cold to prevent burns
Disconnect negative battery terminal and wait 10 minutes to clear system capacitance
Raise vehicle on lift or securely support on jack stands with wheel chocks in place
Remove underbody panels as needed to access sensors - downstream sensors require removal of center or rear undershield sections
Spray oxygen sensor threads generously with penetrating oil and allow to soak for 15-20 minutes
Locate sensor connectors and note routing of wiring harness for reinstallation

Procedure

1
Identify and access target oxygen sensor
Locate the specific oxygen sensor requiring replacement. Upstream sensors are positioned in the exhaust manifolds before the turbochargers (Bank 1 is passenger side, Bank 2 is driver side). Downstream sensors are located after the catalytic converters in the mid-pipe section. For upstream sensors, access may require working from above through the engine bay. For downstream sensors, work from underneath the vehicle with undershields removed.
2
Disconnect oxygen sensor electrical connector
Trace the oxygen sensor wire to its electrical connector. Press the release tab and carefully disconnect the connector. For upstream sensors, connectors are typically clipped to the engine harness near the cylinder heads. For downstream sensors, connectors may be located along the transmission tunnel or frame rail. Inspect connector terminals for corrosion or damage.
3
Remove sensor wire from routing clips
Release the oxygen sensor wire from any routing clips or heat shields along its path. Note the exact routing for proper reinstallation. The wire must be routed away from direct heat sources and moving components. Take photos if necessary to document original routing.
4
Remove the oxygen sensor
Using the oxygen sensor socket and ratchet with appropriate extensions, carefully loosen the oxygen sensor. Turn counterclockwise. If sensor resists removal after initial loosening attempt, do not force it. Apply additional penetrating oil and wait, or use a heat gun to warm the bung (not the sensor itself) to approximately 150-200°F to help break the bond. On turbocharged engines, exhaust manifold sensors are particularly prone to seizing due to high heat cycling.
⚠If sensor will not turn after reasonable effort, the exhaust manifold or catalytic converter threads may be damaged. Consider professional extraction to avoid costly component replacement.
5
Inspect oxygen sensor bung threads
Once sensor is removed, inspect the threaded bung in the exhaust component. Use a wire brush to clean any carbon deposits or corrosion from the threads. Check for thread damage - if threads are stripped or severely corroded, the exhaust component may need repair or replacement. The bung should be clean and show complete thread engagement capability.
6
Prepare new oxygen sensor for installation
Remove new oxygen sensor from packaging and verify it matches the original sensor configuration and connector type. Apply a thin coat of nickel-based anti-seize compound to the sensor threads only - do not apply beyond the first 2-3 threads and keep completely clear of the sensor tip. Maserati specifies nickel-based compound due to high exhaust temperatures on the turbocharged engine.
7
Install new oxygen sensor
Thread the new oxygen sensor into the bung by hand, ensuring it starts straight and threads smoothly. Hand-tighten until the sensor seats against the bung. Using the oxygen sensor socket and ratchet, tighten the sensor firmly. Typical tightening specification for oxygen sensors is 30-37 lb-ft, though no specific torque value is provided in the database for this vehicle. Tighten firmly but do not over-torque as this can damage the sensor or exhaust threads.
8
Route and secure oxygen sensor wiring
Route the oxygen sensor wire following the original path documented during removal. Ensure the wire has adequate slack to prevent tension but is secured away from hot exhaust components, sharp edges, and moving parts. Secure wire in all original routing clips and heat shield passages. The wire should not contact the exhaust system or any components that move with engine torque.
9
Connect oxygen sensor electrical connector
Reconnect the oxygen sensor electrical connector to the vehicle harness, ensuring it clicks firmly into place and the locking tab engages. Gently tug on the connection to verify it is secure. Ensure no moisture or contaminants are present in the connector.
10
Reinstall underbody panels
If removed, reinstall all underbody shields and protective panels, ensuring all fasteners are properly secured. Verify no tools or parts have been left in the work area.
11
Reconnect battery and clear diagnostic codes
Reconnect the negative battery terminal. Using the OBD-II scanner, clear all oxygen sensor-related diagnostic trouble codes. This allows the engine control module to begin fresh monitoring of the new sensor signal.

Reassembly

Ensure all electrical connections are secure and properly locked
Verify oxygen sensor wiring is routed correctly with no contact to exhaust or moving components
Confirm all underbody panels are reinstalled and properly fastened
Double-check that no tools or materials remain in engine bay or under vehicle

Verification

Start the engine and allow it to idle, listening for any exhaust leaks at the oxygen sensor installation point
Monitor live data on OBD-II scanner to verify the new oxygen sensor is providing signal voltage (typically switching between 0.1-0.9V at operating temperature for upstream sensors, relatively steady for downstream sensors)
Allow engine to reach full operating temperature and verify sensor enters closed-loop operation
Take a test drive of at least 10 miles including varied speeds and loads to allow the PCM to complete oxygen sensor readiness monitors
Re-scan for diagnostic trouble codes after test drive - no oxygen sensor codes should be present
Verify check engine light remains off and readiness monitors show complete status for oxygen sensor heater and sensor monitoring