Erratic idling, a fuel filler neck cracking, and the brake lights staying on are all common problems on the 3rd gen Infiniti G35. Here’s the top 5 Infiniti G35 problems of the 3rd generation, years 2003 to 2007.
Common Issues with the 3rd Gen Infiniti G35 (2003 to 2007)
1. Crankshaft and Camshaft Sensor Failure
Symptoms of Crankshaft and Camshaft Sensor Failure
- Check engine light code for cam sensor or crank angle sensor
- Engine stalling
- Excessive cranking when starting
How to Fix Crankshaft and Camshaft Sensor Failure
There is a recall for this problem on some models. Call any Infiniti dealer with your VIN number to find out if your vehicle is covered.
- The crankshaft position sensor is located behind a plastic shield in the bell housing to the automatic transmission
- The camshaft position sensor is located on top of the engine
2. Brake Lights Stay on
Symptoms of a Bad Brake Light Switch
- Brake lights won’t turn off with the car off
Causes of the Brake Lights Stuck on on the 3rd Gen Infiniti G35
The brake light switch tends to get stuck on, leaving the brake lights on. The gear inside may bind up.
How to Fix a Broken Brake Light Switch
The brake light switch is located above the brake pedal. Disconnect the electrical connector and loosen the switch to remove it. Also, check the brake light switch fuse. A bad switch can trip the fuse.
3. Erratic Idle
Symptoms Idle Problems on the 2003 to 2007 Infiniti G35
- Erratic Idle
Causes of Erratic Idling
The 3rd gen Infiniti G35 usually needs the throttle body cleaned every 20,000 miles. There may be erratic idling after cleaning the throttle body. It means the power control module (PCM) is searching for the proper air/fuel ratio and is taking calculations.
How to Fix Erratic Idling
This problem eventually fixes itself.
When cleaning the throttle body, wear eye protection and spray the throttle body with throttle body cleaner. Remove any carbon from the throttle body with a brush. Do not force or push the butterfly plate open or the calibration will be thrown off.
4. Timing Chain Failure
Symptoms of a Bad Timing Chain
- Tapping or ticking noise
Causes of a Bad Timing Chain
The guides and the tensioner on the timing chain tend to break down on the 3rd gen G35.
How to Fix a Bad Timing Chain
To prevent damage to the timing chain, change the oil on time with the recommended oil to keep the tensioner from clogging.
5. Rotting Fuel Filler Neck Hose
Symptoms of a Bad Fuel Filler Neck Hose on the 2003 to 2007 Infiniti G35
- Rotted filler neck hose
Causes of Fuel Filler Neck Hose Rot
The filler neck is a steel tube with a rubber section before entering the gas tank. The metal section can rot and split.
How to Fix the Fuel Filler Neck
There is a recall for this issue. Call an Infiniti dealership with your VIN number to see about replacing it.
3rd Generation Infiniti G35 Model Years
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- Why Crankshaft Position Sensors Fail
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- How to Test a Crankshaft Position Sensor
- How to Replace a Crankshaft Position Sensor
Shop 3rd Gen Infiniti G35 Parts
- Camshaft Position Sensor
- Crankshaft Position Sensor
- Throttle Body Assembly
- Timing Chain
- Headlights & Lighting
- Engine & Engine Management
- Fuel & Emissions
