The 2023 Infiniti QX60 triggering P0430 indicates the bank 2 catalytic converter isn't achieving expected efficiency. This three-row luxury crossover's V6 engine has separate catalysts for each bank, and bank 2 shows reduced performance.
Understanding P0430
P0430 is similar to P0420 but refers to bank 2 (the opposite cylinder bank from bank 1). The ECM compares pre and post-catalyst oxygen sensors. Excessive similarity in their activity patterns indicates reduced catalyst efficiency.
QX60 Engine Configuration
The 2023 QX60 uses a 3.5-liter V6 engine with bank 2 typically being the driver's side (front bank in transverse mounting). Each bank has its own catalytic converter and oxygen sensors.
Why Bank 2 Specifically
Bank 2 issues may relate to that specific catalyst, but also consider causes that might affect one bank differently—like exhaust leaks, cylinder-specific misfires, or sensor placement. Sometimes both catalysts fail around the same time.
Oxygen Sensor Analysis
Monitor both bank 2 O2 sensors. The upstream sensor should oscillate actively between rich and lean. The downstream sensor should show minimal oscillation. Similar patterns indicate catalyst degradation.
Root Cause Investigation
Before replacing the catalyst, check for causes that may have damaged it: misfires sending unburned fuel to exhaust, coolant leaks contaminating the catalyst, or extended rich/lean operation.
Repair Costs
Bank 2 oxygen sensor replacement costs $150-350. Catalytic converter replacement ranges $1,000-2,500 depending on OEM versus aftermarket.