Infiniti FX35 Engine Camshaft Position Sensor Replacement Guide (2003-2012)
Fix stalling, hard starts, and common P0340/P0345 error codes on your FX35 by choosing the right replacement sensor.
- For reliable repairs, use only Genuine INFINITI or Hitachi brand camshaft position sensors.
- It is highly recommended to replace all camshaft sensors at the same time, not just the one that failed.
- Be aware of the sensor count difference: 2003-2008 models use two sensors, while 2009-2012 models use four.
- A faulty camshaft sensor is a common cause of stalling, hard starts, and the 'VDC OFF' and 'SLIP' lights.
Is Your FX35 Stalling or Hard to Start? It Could Be a Camshaft Sensor.
If your 2003-2012 INFINITI FX35 suddenly stalls, takes a long time to start, or feels sluggish, a faulty Engine Camshaft Position Sensor is a very common cause. These sensors are known to fail on the VQ35DE and VQ35HR engines. When they do, they trigger the Check Engine Light and often the 'SLIP' and 'VDC OFF' lights as well. This guide will help you understand the symptoms, choose the correct aftermarket replacement, and know what to expect for repair costs.
Generation and Engine Differences
It is important to identify your FX35's specific engine, as it affects the number of sensors you need:
- 2003-2008 FX35 (VQ35DE Engine): These models have two camshaft position sensors located at the rear of the engine, one for Bank 1 (passenger side) 🎬 Watch this step-by-step Bank 1 sensor replacement guide. and one for Bank 2 (driver's side). 🎬 See how to replace the Bank 2 sensor yourself.
- 2009-2012 FX35 (VQ35HR Engine): These later models have four camshaft position sensors, two for each cylinder bank (intake and exhaust).
Known Issues: Recall and Technical Service Bulletins (TSBs)
There was a significant recall affecting early models. NHTSA Recall #03V-455 was issued for some 2003-2004 INFINITI models due to improper solder joints on the camshaft and crankshaft sensor circuit boards. This defect could cause the engine to stall without warning. The remedy was to replace the faulty sensors. While this recall is old, it highlights the known sensitivity of these parts on this platform.
Choosing the Right Aftermarket Brand is Critical
Vehicle owner forums and mechanic experiences are very clear: for the INFINITI FX35, not all aftermarket sensors are created equal. Using cheap, unverified brands often leads to the same problems returning quickly, or even new issues appearing right after installation. To avoid doing the job twice, brand selection is your most important decision.
Aftermarket Brand Quality: Tiers for Your FX35
When shopping for a replacement, consider these brand tiers:
- Tier 1 (OEM & OEM Manufacturer): Hitachi, Genuine INFINITI. Hitachi is the Original Equipment Manufacturer (OEM) for INFINITI's camshaft sensors. This means a Hitachi sensor is functionally identical to the part you would buy from an INFINITI dealer, but often at a lower price. This is the most highly recommended option for reliability and a guaranteed fit. Nissan has also released an updated version of the sensor with a metal body, which is preferable to the older all-plastic design.
- Tier 2 (Reputable Aftermarket): Denso, Delphi, NGK, Standard Ignition (SMP). These are well-known brands that produce reliable electronic components. While Hitachi is the top choice, a sensor from one of these brands is a viable alternative if an OEM or Hitachi part is not available. They generally meet or exceed OEM specifications.
- Tier 3 (Budget Options): Dorman, URO Parts, Walker, and others. While these brands offer a significant cost saving, they are a gamble for this specific part on the FX35. There are numerous owner reports of these sensors failing prematurely or being dead-on-arrival. Only consider these if you are on a strict budget and are prepared for the risk of a repeat repair.
Pro Tip: Replace in Pairs (or Sets)
Because these sensors are exposed to the same heat and conditions, when one fails, the other is often not far behind. It is strongly recommended to replace both camshaft sensors at the same time (or all four on 2009-2012 models). Many owners also choose to replace the crankshaft position sensor simultaneously as a preventative measure.
Typical Replacement Costs
The cost can vary based on the brand you choose and whether you do the work yourself.
| Part/Service | Estimated Cost (per sensor) |
|---|---|
| New OEM (INFINITI Dealer) | $100 - $145 |
| New Aftermarket (Hitachi/Denso) | $50 - $100 |
| New Aftermarket (Budget) | $21 - $45 |
| Shop Labor | $100 - $225 |
Frequently Asked Questions (FAQ)
Where are the camshaft sensors located on my FX35?
On 2003-2008 models, the two sensors are at the very back of the engine, near the firewall, on the top of each cylinder head. Bank 1 is on the passenger side, and Bank 2 is on the driver's side. Access is tight, and the work is often done by feel.
🎬 Watch this video to see exactly where these sensors are located.Can I replace just the one bad sensor?
You can, but it is not recommended. The sensors degrade at a similar rate. Replacing only the failed one often leads to the other one failing shortly after, requiring you to do the same repair again.
What tools do I need for the replacement?
The job requires basic hand tools. The most important is a 10mm wrench or a small socket with a ratchet to remove the single bolt holding the sensor in place. A magnetic tool can be very helpful for retrieving the bolt if you drop it in the tight space.
Do I need to reset the computer after replacing the sensor?
Yes. After replacing the sensor(s), the trouble codes stored in the ECU must be cleared. You can do this with an OBD-II scanner. If you don't have a scanner, disconnecting the car's battery for about 10-15 minutes will also typically clear the codes and reset the system.
Helpful Videos
Technical Specifications
OEM Part Numbers: 23731-AL61A 23731-6J90B 23731-AL61D 23731-6J90D 23731-JA11B
The VQ35DE engine (2003-2008) uses two sensors, one for Bank 1 (passenger side) and one for Bank 2 (driver side). The VQ35HR engine (2009-2012) uses four sensors, two per bank. The sensors are held in by a single 10mm bolt and use a 3-pin electrical connector.
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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 FX35:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your FX35 Stalling or Hard to Start? It Could Be a Camshaft Sensor.
- Generation and Engine Differences
- Known Issues: Recall and Technical Service Bulletins (TSBs)
- Choosing the Right Aftermarket Brand is Critical
- Aftermarket Brand Quality: Tiers for Your FX35
- Pro Tip: Replace in Pairs (or Sets)
- Typical Replacement Costs
- Frequently Asked Questions (FAQ)
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