What does code P0440 mean on a Lexus and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your Lexus, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes for your Lexus
- Gas cap loose or faulty
- Purge or vent valve stuck
- Charcoal canister or hose leak
Symptoms
- Check Engine Light
Typical fixes
- Replace gas cap
- Test purge/vent valves
- Smoke test EVAP system
Repair cost range
For a Lexus, repairs for P0440 often fall between $20 and $400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Lexus
Lexus P0440 EVAP large leak on these older models is typically a gas cap seal or a failed VSV (vacuum switching valve) in the EVAP system. The GX470 and 4Runner-based platforms also see charcoal canister failure—inspect for physical damage to the canister before smoke testing.
Most commonly affected models
RX300/330 2000–2006ES300/330 2000–2006GX470 4.7L 2003–2009