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So, while I was trying to correct my loss of fuel in this thread https://mazdaspeeds.org/index.php?threads/fuel-pressure-drops-then-stalls.5606/ I replaced a number of parts related to fuel. Prior to all this, I have had the P0301 and P0300 codes comes up for 3 years. I had accepted that this...

One is coasting, the other was a quick wot on a short road. No sign of the CEL coming back since.

Resolved. See post #59 Updating details: Parts replaced: HPFP valve cover gaskets In tank fuel pump assembly Fuel pump resistor Relief valve All the blue resistors (ETV, Injectors, FP, Circuit) On to the details... Gen1, 2007, 224k miles Turbo is 164k miles old, most everything else is...