fairly significant
Typical Repair Cost:
Average Mileage:
54,000 miles
Total Complaints:
1 complaints

Most common solutions:

  1. replace spark plugs (1 reports)
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problem #1

Nov 152017

MAZDA2 Sport 1.5L V4

  • Automatic transmission
  • 54,000 miles

click to see larger images

rough idle, service engine light

Noticed my engine was developing a increasingly rough idle while stopped. Eventually a service engine light came on. I had the ecu code read at my local auto parts store and the code was a P0300. They suggested trying to replace the spark plugs, but that more serious issues were also possible causes for the code.

For the sake of trying the most simple solution first I changed the spark plugs first. The rough idle & the engine code went away after that, so this appears to have done the trick.

- John P., San Francisco, CA, USA