Product Function Description

The camshaft position sensor (part number 23731-6J906) is a critical component of your Nissan or Infiniti vehicle‘s engine management system. Its primary function is to monitor the rotational position and speed of the engine’s camshaft and transmit this data to the engine control module (ECM). The ECM uses this signal, in conjunction with the crankshaft position sensor, to determine the exact position of the pistons and control sequential fuel injection and ignition timing. For vehicles equipped with the VQ35DE 3.5L and VQ40DE 4.0L V6 engines, a properly functioning camshaft position sensor is essential for reliable engine starting, smooth idle, and optimal performance. This sensor is a direct replacement designed to match the original Hall-effect specifications, ensuring proper fit and reliable operation .

Common Symptoms of a Failing Camshaft Position Sensor

If you are experiencing any of the following symptoms, your camshaft position sensor may be failing and in need of replacement:

• Long cranking or hard starting: The engine requires extended cranking before firing, especially when cold. This indicates the ECM is not receiving a valid camshaft signal for synchronization 

• Intermittent misfire at cruising speeds: The engine misfires or runs rough at steady speeds, often without a consistent pattern. This suggests the sensor signal is dropping out intermittently 

• Poor fuel economy: The ECM cannot optimize fuel injection timing without accurate camshaft position data, leading to increased fuel consumption 

• Check Engine Light with code P0340: Diagnostic trouble code P0340 directly indicates a malfunction in the camshaft position sensor circuit (Bank 1) 

• Engine stalling or no-start: In severe cases, the engine may stall unexpectedly or fail to start altogether if the ECM loses camshaft position synchronization

• Rough idle or hesitation: The engine idles unevenly or hesitates during acceleration due to incorrect ignition timing

If you have confirmed these symptoms through inspection, replacing the camshaft position sensor is the recommended solution.

Product Attributes

Notes:

• This sensor is confirmed for Nissan and Infiniti applications with VQ35DE and VQ40DE engines.

• Hall effect type with 3-pin oval connector.

• Always verify fitment via VIN before purchase.

Component Location & Core Function

Location: The camshaft position sensor is mounted on the rear of the cylinder head, between the engine and the firewall. On VQ35DE and VQ40DE engines, there are two camshaft position sensors (one for each bank), and this sensor (23731-6J906) is typically used on the passenger side (Bank 1) .

Connections: The sensor is secured with a single 10mm bolt and connects to the engine wiring harness via a 3-pin electrical connector . It uses an O-ring seal to prevent oil leaks at the mounting point . The sensor tip faces the camshaft reluctor or signal wheel to detect position changes as the camshaft rotates.

Core Function: The camshaft position sensor serves as a critical input for the ECM‘s engine synchronization and timing control. It uses a Hall-effect element to detect the passing of teeth or slots on the camshaft signal wheel, generating a digital signal that the ECM interprets to determine camshaft position. The ECM uses this signal together with the crankshaft position sensor to establish the correct firing order, control sequential fuel injection, and adjust ignition timing. Without a valid camshaft signal, the ECM cannot synchronize the engine and may default to a limp mode or prevent starting .

When This Part Matters Most

This camshaft position sensor is particularly important for vehicles that are:

• Used for daily commuting – reliable starting and smooth engine operation are essential for daily driving

• High-mileage vehicles where original sensors have degraded from heat and internal component wear 

• Operated in stop-and-go traffic – frequent engine cycles increase demand on the sensor and its signal accuracy

• Vehicles that have experienced intermittent misfire or starting issues – the sensor should be inspected or replaced proactively

In these conditions, the camshaft position sensor is critical for dependable engine operation, and timely replacement prevents drivability issues and potential breakdowns.

DIY or Professional Installation?

This replacement is suitable for DIY if:

• You have basic mechanical skills and access to the sensor location (on VQ35DE/VQ40DE engines, it is mounted on the rear of the cylinder head; removing the upper intake plenum may be helpful for access) 

• You have a 10mm socket, ratchet, and possibly a multimeter for verification.

• You can safely work on the vehicle with the engine cool.

We recommend professional installation if:

• You are unfamiliar with engine sensor replacement or the VQ engine layout.

• The sensor is difficult to access on your specific vehicle model without removing intake components.

• You are not confident in diagnosing electrical issues or clearing trouble codes.

Note: Improper installation can lead to continued engine issues. Ensure the sensor is fully seated and the connector is securely fastened. The sensor is secured with a single 10mm bolt. Apply a thin coat of clean engine oil to the O-ring before installation to prevent damage .

Package Contents

1 x Camshaft Position Sensor (Part Number 23731-6J906). Note: Mounting bolt, electrical connector, and O-ring are NOT included unless stated. Please confirm compatibility with your vehicle‘s model and engine before purchasing.

FAQ

Q1: How can I be sure this sensor fits my Nissan or Infiniti?
A1: Check the existing part number on your current sensor. This part fits Nissan and Infiniti with VQ35DE and VQ40DE engines. Always verify via VIN.

Q2: What type of sensor is this?
A2: This is a Hall effect camshaft position sensor with a 3-pin oval connector.

Q3: What are the symptoms of a failing camshaft position sensor?
A3: Common symptoms include check engine light (P0340/P0345), engine stalling or misfire, hard starting, and reduced power.

Q4: Is this sensor for the left or right side?
A4: This sensor is for the passenger side position.

After Replacement Still Having Issues?

Replaced the camshaft position sensor but still having issues? Check these:

1. Were fault codes cleared? – Old codes may persist until cleared with a scan tool

2. Was the O-ring lubricated? – A dry O-ring can be damaged during installation, causing oil leaks

3. Is the connector fully engaged? – Loose connection causes intermittent faults

4. Is the wiring harness intact? – Check for cuts, chafing, or corrosion along the sensor circuit

5. Was the mounting bolt torqued correctly? – 74-96 in-lb (8.4-10.8 N·m)

6. Was the correct sensor installed? – Verify part number and position (passenger side)

7. Is the ECU functioning? – A faulty ECU can cause sensor-related symptoms

Quality Assurance & Service Commitment

Quality Assurance:
Every component is manufactured under controlled production processes to ensure consistent dimensional accuracy and material integrity. Each unit undergoes the following quality checks before packaging:

• Dimensional inspection – critical dimensions and connector type are verified against design specifications

• Signal output test – sensor signal stability and accuracy are confirmed

• Seal integrity check – O-ring sealing integrity is confirmed

• Surface finish inspection – surface quality is visually verified

Packaging Protection:
Each camshaft position sensor is individually sealed in protective packaging to prevent contamination and physical damage during storage and transit. The packaging includes a clear part number label for easy identification.

Service Commitment:

Related Product Recommendations

When replacing the camshaft position sensor, it is often recommended to inspect and consider replacing the following related components at the same time.