P0300 Diagnostic Code - Random Misfire
Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues
Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM
The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.
how to replace a 1998 Mazda millenia alternator
i have the same problem with my Mazda millenia 2001
Ask its owner for the key.
6 gaskets
most likely in side the transmission pan
pretty sure its under the passenger side head light
How do I hot wire my mazda millennia not for illegal reasons. I lost my key and need to get my car home
a few dollars at your local hardware store.
Try: E-Bay Salvage Yard Dealer
Not sure what you are asking. It is a fairly easy removal and replacment with common tools and can be done in your garage.
8 years/80k Expired unless this has been parked for a few years
Tap on your 1998 Mazda brake rotors with a hammer or mallet until they become loose. The brake rotors will simply slide off.