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Greg, import technician
Category: Mazda
Satisfied Customers: 6756
Experience:  17 years shop owner import
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Mazda protege5 2002 code P0301 cylinder 3 misfire. Engine

Customer Question

Mazda protege5 2002 code P0301 cylinder 3 misfire.
JA: Thanks. Can you give me any more details about your issue?
Customer: Engine runs rough at idle sometimes other times is fine. Lugs a little when it shifts into second (automatic). Only code is the misfire.
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Submitted: 7 months ago.
Category: Mazda
Expert:  Greg replied 7 months ago.

Hi .

The P0301 can be a few issue and i will list them for you .

  • Faulty spark plug 1..First check the spark plugs if not been changed in a long time replace
  • Faulty ignition coil 1, swap injector with #4.. clear codes rested ,If P0304 comes up replace the coil ..
  • Fuel injector 1 harness is open or shorted..Check wiring harness
  • Fuel injector #1 malfunction , as with the coil. swap with another injector on #4 clear codes test
  • Ignition coil #1 wiring harness is open or shorted
  • Ignition coil #1 circuit , bad electrical connection
  • Cylinder #1 compression low. check engine compression .should all be even with each other not more than 5% difference
  • fuel pressure low bad fuel pump.. Fuel pressure test
  • Intake vacuum air leak..
  • Catalytic converter damaged ..Exhaust back pressure test ..
  • Do the above checks and test and get back to me if needed.

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    Kind regards Greg.