INFINITI I35 Camshaft Position Sensor Guide (2002-2004)
Stalling, hard starts, or a Check Engine light on your I35? Your camshaft position sensor is a likely culprit.
- Your I35 has two different camshaft sensors: one with a straight connector (Bank 1/Passenger) and one with an angled connector (Bank 2/Driver).
- For reliability, choose an OEM (Hitachi) or top-tier aftermarket brand. Cheaper sensors are known to fail quickly on this engine.
- A major recall (NHTSA 03V-455) was issued for this problem, highlighting it as a common failure point.
- Replacing both sensors at the same time is highly recommended and is a simple DIY job requiring only a 10mm socket.
Symptoms of a Failing Camshaft Sensor on Your I35
A bad camshaft position sensor on the 2002-2004 I35 will almost always trigger the 'Service Engine Soon' light. You may also experience one or more of the following issues:
- Hard Starting: The engine cranks for a long time before it finally starts.
- Engine Stalling: The engine may shut off unexpectedly while driving or when stopped at a light. This can be a serious safety hazard.
- Rough Idle: The engine may shake or vibrate when the car is in park or at a stop.
- Poor Acceleration: The car feels sluggish and lacks power when you press the gas pedal.
- Warning Lights: In addition to the Check Engine light, the VDC (Vehicle Dynamic Control) and SLIP lights may also turn on.
Recall Notice: NHTSA Campaign 03V-455
In November 2003, INFINITI issued a recall for 2002-2003 I35 models due to faulty camshaft and crankshaft position sensors. The original sensors had internal solder joints that could fail, causing the engine to stall without warning. While this recall is old, it highlights a known weakness. If your car never had the recall service performed, it is critical to replace these sensors. Even if it was, the replacement parts can still fail over time.
Choosing the Right Aftermarket Sensor: Quality Matters
For the VQ35DE engine in your I35, the quality of the camshaft position sensor is extremely important. Owner forums are filled with stories of cheap aftermarket sensors failing within weeks or even days, causing the same problems to return. To avoid doing the job twice, it's best to choose a quality part.
Brand Quality Tiers for Your INFINITI I35
- Tier 1 (OEM & OEM-Equivalent): Hitachi is the original equipment manufacturer (OEM) for INFINITI, meaning they made the part that was installed at the factory. A Hitachi-branded sensor is identical to the genuine INFINITI part but often costs less. This is your most reliable choice. Other top-tier brands include Delphi and NGK.
- Tier 2 (Reputable Aftermarket): Brands like Standard Ignition (SMP), Walker Products, and Beck Arnley have a long history of producing reliable parts and are a solid second choice to OEM.
- Tier 3 (Economy Brands): While brands like Dorman or other value-priced options offer a direct fit and a low price, be cautious. For this specific part on this specific engine, the risk of premature failure is higher. They may work, but it's a gamble.
Common Ordering Mistake: Straight vs. Angled Connector
Your I35 uses two different camshaft sensors, and they are not interchangeable. Before ordering, check the connector shape.
- Bank 1 (Passenger Side / Firewall Side): Uses a sensor with a STRAIGHT electrical connector.
- Bank 2 (Driver Side / Radiator Side): Uses a sensor with an ANGLED electrical connector.
It is highly recommended to replace both sensors at the same time. If one has failed, the other is likely near the end of its service life.
Cost to Replace INFINITI I35 Camshaft Position Sensors
| Part Type | Price Range (Per Sensor) |
|---|---|
| New OEM (Dealer) | $110 - $180 |
| New Aftermarket (Tier 1) | $60 - $100 |
| New Aftermarket (Tier 2/3) | $21 - $60 |
| Shop Labor | $100 - $200 |
Frequently Asked Questions
How hard is it to replace the camshaft sensors myself?
This is a beginner-friendly DIY job. The sensors are located on the back of the engine and held by a single 10mm bolt each. The passenger side sensor is easy to access. The driver side sensor is a bit tighter to reach but does not require removing major components. The entire job for both sensors can take less than an hour.
Where are the camshaft sensors located on my I35?
Both sensors are on the top of the engine at the rear (flywheel side). Bank 1 (straight connector) is on the passenger side, near the firewall. Bank 2 (angled connector) is on the driver side, closer to the radiator.
What tools do I need for the replacement?
You only need basic hand tools. A 10mm socket with an extension is the primary tool required to remove the bolt holding the sensor in place. You may also want a small flathead screwdriver to help release the electrical connector clip.
Should I replace the crankshaft position sensor at the same time?
It's not required, but it's a good idea. The crankshaft sensor was also part of the 2003 recall and is known to fail in a similar manner. Replacing all three (two cam, one crank) at once provides maximum reliability and peace of mind, as they are all critical for engine timing.
Technical Specifications
OEM Part Numbers: Bank 1 (Straight Connector): 23731-6J90B, 23731-6J90D, 23731-6J906, 23731-6J905, 23731-6J900 Bank 2 (Angled Connector): 23731-AL61D, 23731-AL61A, 23731-AL616, 23731-AL615, 23731-AL610
The VQ35DE engine in the 2002-2004 I35 uses two hall-effect camshaft position sensors located at the rear of the cylinder heads. Each is secured by one 10mm bolt.
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:
- 🛍️ Shop This Part
- Symptoms of a Failing Camshaft Sensor on Your I35
- Recall Notice: NHTSA Campaign 03V-455
- Choosing the Right Aftermarket Sensor: Quality Matters
- Brand Quality Tiers for Your INFINITI I35
- Common Ordering Mistake: Straight vs. Angled Connector
- Cost to Replace INFINITI I35 Camshaft Position Sensors
- Frequently Asked Questions
- 🎟️ Get 5% Off