To replace a camshaft sensor on an Infiniti G35, disconnect the battery, locate the faulty sensor, remove its retaining bolt, install the new sensor, reconnect the wiring, and clear any diagnostic trouble codes.
For many Infiniti G35 owners in the United States, a failing camshaft position sensor can cause hard starting, rough running, reduced power, or a check engine light. Fortunately, replacing the sensor is usually a straightforward repair that many DIY enthusiasts can complete with basic hand tools.
The exact sensor location depends on the engine version and model year, but the overall process remains similar. Careful installation and proper diagnosis are important because camshaft sensor symptoms can overlap with crankshaft sensor or wiring issues.
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What Does the Camshaft Position Sensor Do?
The camshaft position sensor monitors camshaft rotation and sends timing information to the engine control module. The computer uses this data to manage fuel injection and ignition timing.
When the sensor fails, the engine may struggle to start, idle poorly, hesitate during acceleration, or enter a reduced-performance mode. A check engine light is also common.
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Primary Function
Provides camshaft position data for ignition and fuel timing.
Common Failure Result
Causes timing-related driveability issues and diagnostic trouble codes.
Common Symptoms of a Bad Camshaft Sensor
Typical symptoms include difficult starting, intermittent stalling, rough idle, poor acceleration, and illuminated check engine lights. Some vehicles may crank longer than normal before starting.
Hard Starting
The engine may require multiple attempts to start.
Engine Stalling
Loss of sensor signal can interrupt normal engine operation.
Tools and Parts You Need Before Starting
Gathering the correct tools before beginning the repair makes the job faster and reduces the chance of damaging components.
Most Infiniti G35 models require a ratchet, extension, socket set, safety gloves, and a replacement camshaft position sensor that matches the vehicle’s engine and model year.
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Basic Hand Tools
Ratchet, extension, sockets, and screwdrivers.
Replacement Sensor
Use a quality sensor designed for the Infiniti G35.
Preparation Checklist
Park on a level surface, allow the engine to cool, and disconnect the negative battery cable before touching electrical connectors.
Safety First
Avoid burns and accidental electrical shorts.
How to Replace Camshaft Sensor Infiniti G35 Step by Step
The exact location varies by engine bank, but the overall replacement process is similar across most G35 models.
Work carefully around wiring harnesses and avoid pulling on connectors by the wires.
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Step 1
Disconnect the negative battery terminal.
Step 2
Locate the affected camshaft position sensor.
Step 3
Unplug the electrical connector.
Step 4
Remove the retaining bolt and pull out the old sensor.
Step 5
Install the new sensor and tighten the bolt securely.
Step 6
Reconnect the electrical connector and battery.
Signs of a Successful Installation
The engine starts normally, runs smoothly, and no camshaft sensor-related fault codes return after a test drive.
Smooth Idle
Indicates the engine is receiving proper timing information.
Troubleshooting After Replacement
If the check engine light remains on after replacing the sensor, scan the vehicle for active and pending trouble codes.
A persistent fault may point to wiring damage, a poor connector connection, a crankshaft sensor issue, or an incorrect replacement part.
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Inspect Wiring
Look for corrosion, broken insulation, or loose terminals.
Check Codes
Use an OBD-II scanner to verify current faults.
When the Engine Still Will Not Start
Verify the correct sensor bank was replaced, inspect related sensors, and check battery voltage. Additional diagnostics may be necessary if multiple timing-related codes are present.
Sensor Verification
Confirm the replacement sensor matches the original location.
Common Mistakes to Avoid
Many replacement problems occur because the wrong sensor is installed or the electrical connector is not fully seated.
Avoid forcing the sensor into place and inspect the O-ring before installation to prevent leaks or improper fitment.
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Wrong Sensor
Different engine banks may use different sensor positions.
Damaged Connector
Bent or loose terminals can trigger recurring fault codes.
Skipping Diagnostics
Always confirm the fault code before replacing parts.
When to Seek Professional Help
If multiple engine timing codes remain after replacement or if wiring repairs are required, professional diagnostic equipment may save time and prevent unnecessary parts replacement.
Complex Electrical Faults
Advanced testing may be needed to isolate the root cause.
Frequently Asked Questions
Q
How long does it take to replace a camshaft sensor on an Infiniti G35?
Most DIY replacements take between 30 minutes and 90 minutes depending on engine configuration, access, and experience level.
Q
Can I drive with a bad camshaft position sensor?
The vehicle may still run, but performance, fuel economy, and reliability can suffer. Stalling or no-start conditions can also occur.
Q
What fault codes are commonly associated with a bad camshaft sensor?
Codes such as P0340, P0345, and related camshaft position sensor faults are commonly reported when the sensor or its circuit has a problem.
Q
Do I need to reset the check engine light after replacing the sensor?
Many vehicles require code clearing with an OBD-II scanner. Some codes may clear automatically after several successful drive cycles.
Q
Should I replace both camshaft sensors at the same time?
Some owners choose to replace both sensors when one fails because they often experience similar wear and operating conditions.
✦ Wrapping Up
Conclusion
Learning how to replace camshaft sensor Infiniti G35 models can save time and repair costs while restoring proper engine performance. The job is generally manageable for DIY mechanics with basic tools and careful attention to sensor location.
Proper diagnosis is just as important as installation. Always verify fault codes, inspect wiring, and test the vehicle after completing the repair.
💡 Key Takeaway
Scan the vehicle, confirm the faulty sensor location, replace the sensor carefully, clear codes, and perform a test drive to verify the repair.
Ethan Brooks is an automotive writer at Auto News 7, covering car news, vehicle maintenance, new model updates, recalls, and practical buying guides. He focuses on clear, useful information that helps drivers understand their vehicles and make better ownership decisions.
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