INFINITI FX35 (2003-2012) Crankshaft Position Sensor: A Complete Guide
Fix stalling, hard starts, and the P0335 code on your FX35 by understanding this critical engine sensor.
- A failing crankshaft sensor is a common cause of stalling and no-start issues on the FX35, often triggering a P0335 code.
- For a reliable repair, choose an OEM supplier brand like Hitachi or a reputable aftermarket brand like Denso; avoid cheap, unverified sensors.
- The sensor is located on the passenger side of the engine block near the transmission; access is tight but DIY replacement is possible with basic tools.
- It is highly recommended to replace the camshaft position sensors at the same time as the crankshaft sensor as a preventative measure.
Is Your FX35 Stalling or Running Rough?
A failing crankshaft position sensor is a very common problem on the 2003-2012 INFINITI FX35. These sensors are exposed to intense engine heat, which can cause them to fail over time. When the sensor starts to go bad, it sends incorrect signals—or no signal at all—to the engine computer. This can cause sudden and frustrating problems, often leaving you stranded. The most common diagnostic trouble code associated with a failure is P0335 (Crankshaft Position Sensor "A" Circuit Malfunction).
Choosing the Right Aftermarket Sensor: Brand Matters
When replacing this sensor on your FX35, the brand you choose is critical. Owner forums and mechanic experiences show that cheap, unproven sensors often fail quickly, causing the same problems to return. To avoid doing the job twice, it's best to invest in a quality part.
Aftermarket Brand Quality Tiers
| Tier | Brands | Assessment |
|---|---|---|
| Tier 1: OEM Supplier | Hitachi | Hitachi is the original equipment (OE) supplier for many Nissan and INFINITI parts, including this sensor. Choosing Hitachi is the closest you can get to a genuine dealer part without the higher price tag. It is widely recommended by FX35 owners for reliability. |
| Tier 2: Reputable Aftermarket | Denso, NGK/NTK, Delphi, Standard Ignition (SMP) | These brands have a strong reputation for producing quality sensors that meet or exceed OE standards. Denso, in particular, is known for its highly accurate MRE (Magnetic Resistant Element) sensors and is also an OE supplier for many vehicles. They are a solid choice if a Hitachi part is not available. |
| Tier 3: Economy/Budget | Dorman, Walker, Prenco, and other store brands | While these brands offer a lower price, their long-term reliability can be a gamble for sensitive electronics like a crankshaft sensor. Some owners report premature failures. They may be suitable for a temporary fix, but for a long-term solution, a Tier 1 or Tier 2 brand is strongly recommended. |
Pro Tip: Be cautious of counterfeit parts, especially on online marketplaces. Fake sensors sold in what looks like genuine Hitachi or Nissan packaging are common. Purchase from reputable auto parts retailers to ensure you are getting a legitimate product.
Known Issues & Recalls
There was a significant recall early in the FX35's production run. NHTSA Recall #03V-455 was issued for some 2003-2004 models because the circuit boards in the crankshaft and camshaft position sensors could have bad solder joints. This defect could cause the engine to stall without warning. The fix was to replace the sensors. While this recall applies to older models, it highlights the known sensitivity of these parts on the VQ35 engine. No other recalls specifically for the crankshaft position sensor apply to the 2003-2012 FX35 range.
Frequently Asked Questions (FAQ)
Where is the crankshaft position sensor located on the FX35?
The crankshaft position sensor is located on the lower part of the engine block, on the passenger side, where the engine meets the transmission 🎬 See this video to locate your cam and crank sensors bell housing. It is held in by a single 10mm bolt. Access is tight, and it's often necessary to work from underneath the vehicle.
🎬 Watch this step-by-step FX35 crankshaft sensor replacement walkthroughShould I replace the camshaft sensors at the same time?
Yes, it is highly recommended. The crankshaft and camshaft position sensors work together to time the engine. They are exposed to the same conditions and tend to fail around the same time. Many mechanics and owners suggest replacing all three sensors (one crank, two cam sensors on 2003-2008 models) at once to prevent future issues. The 2009-2012 FX35 has four camshaft sensors.
What are the symptoms of a bad crankshaft sensor vs. a camshaft sensor?
The symptoms are very similar: stalling, hard starting, rough idle, poor acceleration, and the Check Engine, VDC, and SLIP lights illuminating. A key difference is that a completely failed crankshaft sensor will often prevent the engine from starting at all, as the ECU has no signal for engine rotation. A bad camshaft sensor might allow the engine to start but run very poorly. An OBD-II scan is the best way to tell which sensor is triggering the code (P0335 for crank, P0340/P0345 for cam).
Do I need to reset the computer after replacement?
Yes. After installing the new sensor, you must clear the diagnostic trouble codes from the engine control unit (ECU). This can be done with a standard OBD-II scanner. If you don't clear the codes, the Check Engine Light may remain on.
Helpful Videos
Technical Specifications
OEM Part Numbers: 23731-AL60A 23731-AL60C 23731-8J106 23731-JA10B
The sensor is a magnetic or Hall-effect type sensor that reads teeth on the crankshaft's signal plate to determine engine speed and position. It is secured by one 10mm bolt and has a single 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: