Question about 2003 Mazda Protege

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Check engine light intermittently flashing, car jerking.

I just bought a 2003 Mazda Protege with 140,000 miles. While driving it home the car started to **** a bit and the check engine light came on. I stopped for a bit and started driving again with no problem and then about a half hour later it started jerking again and the light started flashing. I stopped again. When I started to drive again the light remained on (but not flashing) and the car was jerking subtly. The O2 sensor was replaced right before I bought it. What is the likely problem?

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Could be fuel or electrical related. Since you may not know the history, this may take a while.
Any amount of smoke from exhaust? White, Blue, Black?
Start with most obvious and inexpensive:
1. Fuel filer clogged (replace fuel filter).
2. Could be the ECM (Electronic Control Module). It controls the ignition spark timing.
A few other things... consider other expert solutions...

Posted on Sep 25, 2009

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If you have one of the chain auto parts stores near you, check with them by phone first but most of them offer a free scan of your computer which probably has diagnostic codes stored related to your problem.

Posted on Sep 25, 2009

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