2002-2004 INFINITI I35 Engine Crankshaft Position Sensor Guide
Stalling or no-start problems on your INFINITI I35 are often caused by this critical, but easy-to-replace, sensor.
- A faulty crankshaft sensor is a very common cause of stalling and no-start issues on the 2002-2004 I35, confirmed by an official recall.
- For reliability, choose an OEM sensor from Hitachi; cheaper aftermarket brands are known to fail quickly on this engine.
- This is a simple DIY replacement that requires only basic tools and can be completed in under an hour.
- Consider replacing the two camshaft position sensors at the same time, as they are also a common failure point.
Is Your I35 Stalling or Hard to Start? Check the Crank Sensor.
A failing crankshaft position sensor is one of the most common reasons for engine problems in the 2002-2004 INFINITI I35. This issue was so widespread that INFINITI issued a major recall for it. When this sensor starts to go bad, it can leave you stranded. The symptoms often start small but can quickly become serious, leading to a no-start condition or dangerous stalling while driving.
Recall Notice: A Known Failure Point
In November 2003, INFINITI recalled 2002-2003 I35 models for faulty crankshaft and camshaft position sensors (NHTSA Campaign ID: 03V-455). The original sensors had internal solder joints that could break, causing the engine to stall without warning. While this recall is old, it confirms that the original sensors were a significant weak point. Before buying a new part, you may want to check if your vehicle had the recall service performed by an INFINITI dealer.
Choosing the Right Aftermarket Crankshaft Sensor
For a critical sensor like this on the I35's VQ35DE engine, part quality matters. Owner experiences show that cheap, unbranded sensors often fail quickly, sometimes right out of the box. It is strongly recommended to use a sensor from the original equipment manufacturer (OEM) or a top-tier aftermarket brand.
Brand Quality Tiers for Your INFINITI I35
- OEM / Tier 1 (Highly Recommended): Hitachi is the original manufacturer that supplied these sensors to INFINITI. Choosing a Hitachi-branded aftermarket sensor is the safest bet for reliability and is often cheaper than buying the same part from a dealer. Other high-quality brands like Delphi and NGK are also trusted names for engine sensors.
- Tier 2 (Good Value): Brands like Standard Ignition (SMP) and Dorman are well-known in the aftermarket. They can be a reliable option if a Tier 1 brand is not available, but for this specific part, sticking with the OEM supplier (Hitachi) is preferred by most mechanics and experienced owners.
- Tier 3 (Economy / Use with Caution): This category includes brands like Walker Products, Holstein, and other lower-cost options. Given the history of sensor failures and stalling issues with the I35, using an economy-grade sensor is not recommended as it may lead to the same problems returning quickly.
Pro Tip: The crankshaft position sensor and the two camshaft position sensors on the I35 are known to fail around the same time. Since they were all part of the same recall and the labor is minimal, it is wise to consider replacing all three sensors at once for peace of mind.
Typical Replacement Costs
The cost to replace the crankshaft position sensor can vary based on the part you choose and local labor rates.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Part | $34 - $100 |
| New OEM Part | $90 - $175 |
| Shop Labor | $75 - $200 |
| Total Professional Job | $110 - $375 |
Frequently Asked Questions
Where is the crankshaft position sensor located on the 2002-2004 I35?
The sensor is located on the bottom of the engine, where the engine meets the transmission. You will need to get under the car to see it. It is mounted on the transmission bell housing and held in by a single 10mm bolt. It reads teeth on the flywheel to determine the crankshaft's position.
Is this a difficult job to do yourself (DIY)?
No, this is considered an easy DIY job for most people with basic tools. The replacement involves removing a lower plastic splash shield, unplugging the electrical connector, and removing one 10mm bolt. The entire process can usually be done in under an hour.
Should I replace the camshaft sensors at the same time?
It is highly recommended. The camshaft sensors are also a known failure point and were part of the same recall as the crankshaft sensor. Since they are also relatively inexpensive and easy to access, replacing all three sensors (1 crank, 2 cam) at once is a smart preventative measure to avoid future breakdowns.
What happens if I use a cheap, non-Hitachi sensor?
While it might work initially, many owners report that cheap aftermarket sensors for this engine fail prematurely, causing the original symptoms like stalling and no-starts to return. Given the critical safety function of this part, spending a little more on an OEM-quality sensor from Hitachi is a worthwhile investment.
What is the main trouble code for a bad crankshaft sensor?
The most common diagnostic trouble code (DTC) associated with a failing crankshaft position sensor is P0335, which means "Crankshaft Position 'A' Circuit Malfunction". If your check engine light is on, scanning for codes is the first step in diagnosis.
Technical Specifications
OEM Part Numbers: 23731-AL605 23731-AL606 23731-AL60C 23731-6J906 23731-8J100 23731-8J105 23731-8J106
This is a Hall Effect sensor that reads the position of the crankshaft from the flywheel/flexplate. It is located on the transmission bell housing and uses a single bolt for mounting.
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 I35: