2003 Mazda MPV P0327 Code Explanation: Ignition Issues, Sensor Location, and Safety Advice

Hello, I'm John Fiegenbaum and I own a 2003 Mazda MPV LX with a 6-cylinder 3.0L engine. Recently, my check engine light came on, followed by the O/D OFF light flashing. This has caused noticeable jerking during acceleration and deceleration—especially when shifting gears—but there is no grinding noise. I took the vehicle to NAPA, where they diagnosed a code P0327 using their diagnostic tool. The code is described as generic, pointing to an ignition-related issue, possibly involving the knock sensor or PCM/ECM sensor. My main questions are: How can an ignition system problem affect transmission behavior? Can a do-it-yourselfer safely replace both sensors? Where are these sensors located in a 2003 Mazda MPV? And most importantly—should I avoid driving the car entirely until it's inspected by a professional? Thank you in advance for any technical insights or guidance on this issue.