Infiniti Q45 (1998-2006) Engine Camshaft Position Sensor Replacement and Information
Stalling or hard starts in your Q45 could be a failing camshaft position sensor.
- Identify your engine first: 1998-2001 models have the VH41DE V8, while 2002-2006 models have the VK45DE V8.
- Strongly prefer Hitachi brand sensors, which are the OEM supplier, to avoid repeat failures and persistent issues.
- A failing sensor can cause the engine to stall while driving, which is a major safety hazard.
- For 2002-2006 models, there is only one camshaft sensor, and it is the same part as the crankshaft sensor.
Understanding Your Q45's Camshaft Sensor Needs
Before buying a new camshaft position sensor, it's important to know which Infiniti Q45 you own. The 1998-2006 model years span two different generations with different engines.
- 1998-2001 Q45 (FGY33): This generation uses the 4.1L VH41DE V8 engine.
- 2002-2006 Q45 (F50): This generation uses the 4.5L VK45DE V8 engine.
These engines use different parts, so ensure you are purchasing a sensor specified for your exact year and engine to guarantee fitment.
OEM vs. Aftermarket: A Critical Choice for Your Infiniti
For most routine parts, aftermarket brands offer a great balance of cost and quality. However, for electronic sensors on Nissan and Infiniti vehicles of this era—especially the camshaft and crankshaft position sensors—the choice is more critical. Forum discussions and mechanic recommendations are overwhelmingly in favor of using the Original Equipment Manufacturer (OEM) part. The OEM manufacturer for Infiniti is often Hitachi. Using lower-quality aftermarket sensors on these V8 engines is known to cause persistent issues, including continued stalling, no-start conditions, and check engine lights, often leading to replacing the part a second time.
🎬 Watch: 7 common symptoms of a failing camshaft sensorChoosing the Right Aftermarket Brand
If you choose to go with an aftermarket part, it's best to stick with reputable brands known for producing quality electronics. Based on owner feedback and brand reputation, here is a general tiering of available brands:
- Tier 1 (OEM Manufacturer): Hitachi. This is widely reported as the OEM supplier for Infiniti. Choosing Hitachi is the safest bet for a reliable, long-lasting repair that performs like the original part.
- Tier 2 (High-Quality Aftermarket): NGK/NTK, Standard Motor Products (SMP), and Delphi. These brands have a reputation for producing reliable electronic components and are generally considered a step up from budget options.
- Tier 3 (Budget-Friendly): Brands like Dorman, Walker, and other lower-priced options are available. While they can save you money upfront, the risk of premature failure or compatibility issues is higher with this specific part on this specific vehicle.
A Common Ordering Mistake
For the 2002-2006 Q45 (VK45DE), the camshaft position sensor and the crankshaft position sensor are the identical part. Owners often mistakenly think there are two different cam sensors (one for each bank), but there is only one. Do not confuse it with other sensors on the valve cover area.
Is There a Recall on the Camshaft Position Sensor?
While Nissan and Infiniti did issue recalls for camshaft position sensors on other models, searches of the NHTSA database did not show a specific recall for this part on the 1998-2006 Infiniti Q45. Recalls for this vehicle range typically concern Takata airbags or brake light switches.
| New OEM (Dealer) | $90 - $150 |
| New Aftermarket | $27.24 - $87.33 |
| Used OEM | $20 - $50 (Not recommended for sensors) |
| Shop Labor | $50 - $150 |
Frequently Asked Questions
How many camshaft sensors does my 1998-2006 Q45 have?
The 2002-2006 Q45 with the VK45DE engine has only one camshaft position sensor. The earlier 1998-2001 models with the VH41DE engine may have a different configuration; always verify with your vehicle's specific service manual or part diagram.
Why is everyone so insistent on using Hitachi sensors?
Infiniti's ECU from this period is known to be very sensitive to the specific voltage signals produced by the OEM sensor. Many aftermarket sensors, while they may fit physically, do not replicate this signal precisely, leading to performance problems, error codes, and premature failure. Paying extra for the Hitachi sensor often saves money and time by avoiding a second repair.
Can I replace this sensor myself?
Yes, this is a DIY-friendly job for most home mechanics. The sensor is typically located on the back of the cylinder head and is held in by a single 10mm bolt. After disconnecting the electrical plug, you simply unbolt the old sensor and install the new one. The entire process usually takes less than an hour.
🎬 See this walkthrough of the sensor replacement processWill a new sensor fix my P0340 code?
In most cases, yes. The P0340 code specifically points to a fault in the camshaft position sensor circuit. Replacing a failed sensor with a high-quality part like a Hitachi is the most common fix. However, the code could also be caused by wiring issues or, in rare cases, a problem with the ECU.
🎬 Watch: How to test and replace a P0340 sensorHelpful Videos
Technical Specifications
OEM Part Numbers: 23731-6P000 23731-4M50B 23731-4M50D 23731-AL61A
The correct sensor depends on the engine. For the 2002-2006 VK45DE engine, the camshaft position sensor (one total) and the crankshaft position sensor are identical parts. For the 1998-2001 VH41DE engine, the part number is different. Always verify the part number for your specific vehicle.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- INFINITI Q45:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding Your Q45's Camshaft Sensor Needs
- OEM vs. Aftermarket: A Critical Choice for Your Infiniti
- Choosing the Right Aftermarket Brand
- A Common Ordering Mistake
- Is There a Recall on the Camshaft Position Sensor?
- Cost Comparison
- Frequently Asked Questions
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