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Have been doing some reading about P0431 codes... I got one a few months ago. It came and went a few times. Seems like it could be my downstream O2 sensor, judging from some posts around the web. Or, it could be something else (vacuum leak? cat itself? precat? a timing belt? spark plugs?)...

Hi! Recently had a P0400 code and then cleaned out the valve in the throttle bottle, which was dirty. The code went away but came on again a few weeks later after I adjusted the Idle Air Bypass valve. I'm not sure it could actually be related to the Air Bypass valve. I suspect it could be...

Hi guys! Just noticed that my transmission shifts slightly hard from 1st to 2nd gear (it just hesitates for a slight millisecond and then "kicks" to the next gear with a very slight shake -- barely noticeable) in the cold mornings for the first half mile or so, and then shifts silky smooth...

So my three back brake lights are not working... I've run a series of 12v test light tests, and I do not get power to the brake light sockets (but power does flow to turn and tail lights, etc), but I DO get power all the way to the red and blue wires on the brake light switch itself. I have...

Hi! I was trying to clean the throttle body (and eventually the EGR valve) on my 2000 Mazda 626 ES V6. I got into the throttle body, and noticed that the gasket was virtually black and the top part disintegrated the second I opened the manifold. I tried to remove the whole throttle body (to...