DEQ Too testing, drop in.
Weekdays, 9am to 4pm. Text us when you're on your way, so we're ready for you.
Can you use DEQ Too?
A quick check before you drive over.
Bring your renewal slip.
It needs a DEQ Too renewal code. We can test a car newer than 2005 that is renewing its Oregon tags in Oregon.
What DEQ Too can't do.
Transfers from out of state, any change of ownership, or anything other than an Oregon renewal.
Nothing extra to pay us.
You pay the fees to the DMV directly. We don't charge anything extra to run the test.
Looking for your results?
The state's DEQ Too site has a VIN search for test results.
Find my DEQ test resultsCheck engine light before a test?
Will P0441 or P0455 make my Prius fail DEQ?
Yes. Any active check engine light causes a DEQ failure regardless of the specific code, and an EVAP monitor that is not ready or is reporting a fault will keep you from passing. Clearing the codes without fixing the cause will not work either, because the car has to complete its emissions self-tests before it is considered ready.
Can I keep driving my Prius with P0441 and P0455?
In nearly all cases, yes. These codes do not affect starting, driving, or the hybrid system, so the car runs normally. The practical problem is the check engine light: a car with an active light will not pass Oregon DEQ.
Does P0455 always mean a bad gas cap on a Prius?
No, but the gas cap is the first and most common thing to check. Often the cap was just left loose after a fill-up. The leak can also come from the purge valve, the canister, the tank hoses, or the leak detection pump, so a cap that looks and feels fine does not rule those out.
Should I use an OEM Toyota gas cap on my Prius?
Yes, we recommend it. Aftermarket gas caps are one of the sneakier causes of P0441 and P0455 on a Prius. They can set the same codes even when they are new and properly tightened. A genuine Toyota cap is inexpensive and takes that variable off the table.
Text us, or book a slot.
A text with a photo of the dash gets you an answer fastest. Booking online holds a day and a time.