Mazda Miata (MX-5) This compact RWD model, offered with many engines options for those are who want to cruise with the top down in a base model, or hit the track in one of the high performance models, has been a popular model since its introduction.

Multiple problem error messages - 2000 Miata

Old 02-25-2012, 09:04 PM
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Join Date: May 2011
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Default Multiple problem error messages - 2000 Miata

My wife owns a 2000 Miata. Recently the check engine light came on. She took it to O'Reilly's for the diagnosis. Three problem errors appeared: P0300 - Random misfire, P0455 - Evaporative Emission gross leak/no flow, P1345 - Cylinder discrimination signal from CMP sensor. The guy at O'Reilly's indicated none of the error messages were critical. Of course, that is just his opinion and is not coming from a mechanic, per se.

Any suggestions or feedback as to what to do next is appreciated.

P.S. About a year ago, I changed out the cam sensor and it fixed the problem we were having at the time.
Old 02-25-2012, 09:53 PM
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Nothing critical..................................ummmmmmm mmmm yeah ok, a misfire is critical since it could destroy your cat-converter, an evap leak is critical cause it could leak fuel/fuel vapors out that may ignite. Try to get a new cam sensor again even if its a used junkyard one just to eliminate that variable as for the EVAP check your gas cap for a bad seal or if its just loose since its saying major leak. Misfire code could be related to cam sensor failure.
Old 02-25-2012, 10:36 PM
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Thanks for the input. May not sleep too well tonight, though.
Old 02-26-2012, 10:26 PM
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Location: Midwest
Posts: 2,390

Misfire could be caused by a lot of different things:
plug, wire, rotor, coil pack, injector, vacuum leaks and a few more.

inspect, clean, test, re-use, and if needed replace.

If you can't sleep remind yourself: "it's just money!" ;-)
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