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Posts Tagged: Ford P0410

Ford P0410, Ford P0491

Ford P0410, Ford P0491 — How to diagnose and fix Ford P0410, Ford P0491 refers to the secondary air system What is secondary air? The secondary air system is an emissions control system that’s used during a cold startup to reduce hydrocarbon emissions. Hydrocarbon emissions are very high at cold startup because the PCM commands a rich fuel mixture to start the cold engine. The cold engine tends to quench combustion early, and that unburned fuel flows into the catalytic converter. To burn that extra fuel, the catalytic converter needs … Read More

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