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I just had my mechanic look at my 2003 Protege5 for the same reason. I get sort of a "Scraping" sound once in a great while (not every time I stop) but I do always get a rythmic, but gentle, jerky feeling as I slow down. My mechanic said the following: he can "flip" (or something similar) the...

Hello, im the guy that originated the thread... I finally replaced the ignition coils 4 days ago and everything was running fine until today. The car still runs smoothly but the CEL stays on. Scanner gives me a P0421. I know what the specific meaning is ("catalyst below threshold bank 1"), but I...

Wow, thanks everyone. Bery useful knowledge in this forum so far! It's 7 below outside and I'm not gonna pretend I know much about mechanics anyway so my mechanic will be replacing those coils for me soon. I'll let everyone know how it turns out.

Ok, so most of you have pointed to three things: plugs, wires or coils. Plugs and wires are new... I'm not sure any coils have been replaced so maybe I should have that done next. The dealer did say that the valve gasket covers were leaking. Could that be indicative of anything? My mechanic...

Thanks for the explanation. Anyone ever get the vague 300 code?

My Mechanic says the code is just "300" but it's too general, which is the problem. The CEL was on/flashing before I had the sprak plugs and wires replaced but it still did not change anything (I don't know if that's what you mean by "coil"). By the way I'm not understanding most of anyone's...

Hello all, first post! And a challenging one too... 2003 Protege5, 107k Here's what's happening: most of the time car runs ok although the check engine light is almost always on. On ocassion, and more frequently, when completely stopped, the revs will go down to almost zero (but it has NEVER...