Q: code p0446

asked by on

I didn't notice I park the truck on a small hill at my inlaws. The rear passenger side was the only side up on the hill. I left it running for about 3 minutes. Came out down his drive way to the next downward hill going towards the highway. I wait for traffic to pass by for about a minute or two. Gave it gas and bam, check engine light came on. Took it to O'reilly to read the code, P0446. It sounds a little bit louder then before and that's from both the inside and outside. My question to you is how concerned should I be to get this problem fix? Will it mess my engine up to no return? Should I stop driving it? For a 1998 4Runner she still sounded good until this happened today. :(

My car has 206000 miles.
My car has an automatic transmission.

Hi there. A P0446 (evaporative emissions system gross leak detected-Toyota defined meaning) sets when there is a fault detected in the evaporative system. The evaporative system is an emissions system responsible for preventing the leakage of fuel vapor into the atmosphere. This will not damage the engine. However, this will fail an emissions test if required in your area. There are several possibilities as to what set the code, but I would take a look at the gas cap and see if it was loose or if it doesn’t seem to tighten correctly; it should have a nice clean click sound, not a crunch. Other possible faults will require a diagnostic tester and equipment to properly check the evaporative system for operation and leaks. YourMechanic has several available technicians to assist you with a check engine light inspection and provide an estimate and proper direction for repair.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Can't reverse

I will assume the transmission does transfer power in the other drive gears. The electronically controlled transmission may have a failed solenoid that directs fluid pressure to the reverse gear assembly. In most cases, the transmission is removed and overhauled...

Q: I have a 2005 Chevy Equinox and yesterday leaving work when I started my car none of my gages work, the airbag light is on, my rad

Given the number of electrical items (the dash gauges) that are not functioning, there is possibly a common wiring or device (relay for instance) failure. Basically, to diagnose something like this you power the circuit "on" and then with the...

Q: I have a 2001 Lincoln LS and the spark plug on the number 8 cylinder is leaking getting oil on the spark plug what do you think th

Sometimes there can be oil on the spark plug threads but the plug itself is not fouled. If the firing end of the plug is OK (not fouled, and not covered with liquid oil and so forth), the cause of...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...