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  1. F150 Ecoboost Maintenance
    Hello, I got P0430 (catalyst efficiency below threshold) 2 days after the spark plug change. I changed the spark plugs but didn't change the coils. OBD2 scanner can't detect any misfires, but sometimes RPM is not constant at idle. Also, I observed a 25% decrease in MPG. The mileage is115K. What...
    p0430 sparkplug catalytic
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