Last reported case: 9 months ago
Based on 4 owner reports, 4 from forums)
What is P0446?
P0446 indicates a problem with the evaporative emission control system's vent control circuit, which manages fuel vapor flow from the gas tank to prevent emissions. This is a medium-severity powertrain issue that primarily affects Ford and Toyota models, particularly the Ford Mustang and Toyota Camry, and can trigger the check engine light. Based on real owner data, repairs are rarely DIY (only 2% of cases) and costs vary widely.
Common Causes:
- Faulty vent control valve or solenoid (most common in Ford Mustang and Toyota Camry models)
- Blocked or restricted evaporative system vent line
- Electrical issues in the vent control circuit wiring or connectors
Symptoms:
- Check engine light illuminated with no noticeable drivability issues (most common symptom reported)
- Possible fuel odor near the vehicle due to improper vapor containment
- Failed emissions test in states requiring inspection
🚗P0446 on 2010 LEXUS ES
This page focuses specifically on P0446 issues reported by 2010 LEXUS ES owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 LEXUS ES Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 LEXUS ES owners
“I bought the car knowing that it had a p0442 and p0446 code. I checked the vacuum canister (looks good, no damage) and the suspect vsv switching valve but it was clicking like it's supposed to.”View original
“I checked the vacuum canister (looks good, no damage) and the suspect vsv switching valve but it was clicking like it's supposed to. I replaced the gas cap but I still don't hear any air escaping when I take it off.”View original
“Quote: Originally Posted by jhomer42 Also, if Im testing the connectors (the plugs), do I need to take off the negative battery cable? Well, depends on what kind of test you want to run, but trying to find power in the Connector with the battery disconnected will get tedious quite quickly..”View original
“Are these valves related to the evap system and the p0446 code? Also, if Im testing the connectors (the plugs), do I need to take off the negative battery cable?”View original
“Quote: Originally Posted by jhomer42 Are these valves related to the evap system and the p0446 code? Not at all, the Left Red VSV is for a ACIS System , basically a Variable Length Intake, the other is for the Throttle Body.”View original
“P0446 EVAP Code Lexus ES 300 1999 Hi all, Ive been working on various things that could be causing this code on my car.”View original
“2002 ES300 Code P0446 3-4 days ago I mixed EVAP hoses which i have already repaired, today I got code P0446 TRAC OFF/VSC And Overheating Also I tested smoke machine and no EVAP leak any help?”View original
These are real experiences shared by 2010 LEXUS ES owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 4 discussions about P0446 from 2010 LEXUS ES owners across automotive communities.
Success rate (25%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 5/27/2025