The 2008 Infiniti G35 uses four oxygen sensors in its exhaust system. Two sensors monitor the air-fuel mixture before the catalytic converters, and two monitor after the converters, one pair on each bank of the V6 engine.
The G35 runs a VQ35DE 3.5-liter V6 with two exhaust banks (Bank 1 and Bank 2). Each bank is equipped with an upstream (pre-cat) O2 sensor and a downstream (post-cat) O2 sensor to help the engine control system optimize combustion and monitor catalytic efficiency. Together, these four sensors provide continuous feedback for emissions control and fuel management.
O2 sensor layout
To visualize the setup, the four sensors are arranged as follows:
- Bank 1 Upstream O2 sensor (pre-cat, Bank 1)
- Bank 1 Downstream O2 sensor (post-cat, Bank 1)
- Bank 2 Upstream O2 sensor (pre-cat, Bank 2)
- Bank 2 Downstream O2 sensor (post-cat, Bank 2)
In total, there are four O2 sensors in a 2008 Infiniti G35, two before and two after the catalytic converters, covering both banks of the V6 engine. If you’re planning maintenance or replacement, verify sensor wiring and connectors, as models can differ slightly by market or trim.
Summary
The 2008 Infiniti G35 has four O2 sensors: two upstream and two downstream, one pair per bank of the V6 engine. This arrangement supports accurate fuel control and effective catalyst monitoring.