Symptoms of P0464
- Check-engine light, often with no obvious change in how the car drives.
- A failed emissions test or incomplete readiness monitors.
- Sometimes a faint fuel-vapour smell (on EVAP codes).
Common causes of P0464
- A worn catalytic converter or an oxygen/air-fuel sensor reading out of range.
- EVAP leaks — a loose or failed gas cap, cracked hose, or purge/vent valve.
- Exhaust leaks, fuel-trim problems, or a fault in a related monitor.
Useful checks before replacing parts
- Watch fuel level data while moving the tank harness, driving over bumps, and repeating conditions that make the gauge fluctuate.
- Inspect connector terminals, ground path, sender sweep, tank-module connector sealing, and wiring near the fuel tank.
- Check for erratic gauge movement, low-fuel warnings, or module data dropouts that match the intermittent signal.
Related OBD-II codes
These nearby emissions entries can help compare wording and pin down the fault area.