Whenever I am unsure as to what plugs to use in anything I always consult SPARKPLUGS.COM. They have a online guide that cannot be beat. Marien inboard and outboards are also covered.
Possibly a vacuum line came undone
Wikipedia says Mazda 6 BUT There really is no equivalent. Mazda moved away from the mid size up-scale market altogether. The Millenia was to be the flagship model for a luxury line that Mazda was planning in the 1990's like what Toyota started with the Lexus, and Honda with the Acura. It never happened and Mazda went after after the small/mid sized sporty type market.
The Mazda6 was introduced for the 2003 model year to replace the Mazda 626. The Mazda6 was designed to be a more sophisticated and upscale car than the 626 because it would be the company's "flagship" or top model since the Millenia was also discontinued at the same time. But there wasn't a direct replacement for the Millenia. The Millenia was introduced as a 1995 model and replaced the Mazda 929. Mazda was planning their own luxury/performance line (called "Amati") to compete with Acura, Lexus and the other premium brands. The Millenia was intended to be the first of three planned Amati models, but the plan was dropped due to cost issues before it got any further than the Millenia. The Millenia sold in much lower numbers than originally planned. A $35k luxury sedan with a Mazda badge was a tough sell against Acura, Lexus and Infiniti models for the same price.
No the factory head unit on a 2001 Mazda Millenia does not have pre outs. You can easily make your own pre outs if you want to keep your factory head unit with a line output converter (LOC). The converter takes the wires from the back of the radio to the rear speakers and converts them into 2 RCA pre outs. Hope this helped.
Too little coolant, or a plugged coolant line.
You can try spraying some carburetor cleaner into the intake by way of a vacuum line or pcv hose Just a little dab will do you. If the engine tries to start it would indicate that you have a fuel problem.
== == In most cases - NO
P1601 code means there is an error on the Powertrain Control Module Communication Line to TCM PO325 code means there is a fault in the Knock sensor circuit
follow the clutch line down to the trans and there is a coupler that is about twice the size of the line and there is a little greyish white ring on the line side pused it squarely towards the coupler till it is all the way in the coupler then pull the line out
flush the radiator
have to replace from the dealer, because of the anti-theft system. Not True. I have a 2002 Mazda Millenia with anti-theft alarm factory installed. I simply ordered a key fob on line for about $30. bucks and it came with the instructions for how to program it. The dealer told me only THEY could do it ... at a cost of about $160.00! Wow big difference. My cheap key fob works GREAT!
MAP sensor lives on a bracket right behind the passenger side upper strut mount. the sensor itself is on the edge of the bracket, right next to the power steering fluid resevoir. it will have a 2 wire connector on it, and a vacuum line