How do you fix code p0012 scion xb 2005?

Answer 1

Okay... I am not a mechanic, but my '05 xB threw these codes. Without getting into too many specifics, the p0442 is fuel evap system, small leak. This is the Scion "gas cap" code. I got this periodically until I replaced my gas cap. Didn't see the code again for about 600 miles. Then one day it threw p0441, p0442, & p0446 together. When I searched for answers online, one mechanic on an xB forum asked if an owner with the same issue had 'topped-off' the gas tank shortly before the lights came on. Sure enough, I had forced about a dollar's worth into the tank at the pump the day it threw those codes. This mechanic said not to do this. In addition, the original gas cap on my Scion says that if the cap is not replaced properly during regular fueling, a malfunction indicator lamp (MIL) my illuminate! This is right on the gas cap! Basically, I disconnected the positive terminal of my battery and left it off for about 30 minutes, reconnected the battery, and the lights disappeared. A local mechanic told me to try this. If there is really an issue, the lights will be back. I bought a cheap OBD II code reader from O'Reilly Auto Parts store to check the computer (contrary to some nervous and/or bogus mechanics, everyone should have one of these nowadays), and the codes haven't come back in over 1500 miles (I drive a lot)!!! Rant: Many mechanics complain about owners attempting to educate themselves about their cars. Don't trust a mechanic with this kind of attitude. Yes, a person with a little knowledge can be a pain in the backside to those who are pros, but consider that in Europe, there are certain repairs an operator must be able to perform successfully just to get a regular license! The OBD II code system does not diagnose problems, it simply narrows the areas a mechanic needs to check to solve the problem. That said, I read a lot of rubbish online from some mechanics admonishing the uninformed not to "throw parts at the problem," but this is exactly what many dealerships and mechanics do, and Toyota does not help. This kind of self-serving statement serves only to scare do-it-yourselfers from doing it themselves. I've read that some folks have replaced their entire fuel systems because of these same 3 codes by dealerships and other "reputable" shops. How much did that cost? Who pays that cost? Because of 1 honest, experienced Scion mechanic, I fixed the car myself for NOTHING!