Why would my gas mileage reduce drastically after an oil change?

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I recently had my secondary air pump and both check valves replaced to get an inspection. The car ran good no engine light. now after an Oil change my engine light is back on and my gas mileage is very poor, it reduced drastically. any idea on what the issue could be?

klh1964 in Olean NY

Aug 17, 2016

What are the best Pontiac repair shops?

RepairPal Certified shops can diagnose and repair your 2000 Pontiac Grand Prix. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

Why would my gas mileage reduce drastically after an oil change?

What is your question?

klh1964 in Olean NY

Aug 17, 2016

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What are the best Pontiac repair shops?

RepairPal Certified shops can diagnose and repair your 2000 Pontiac Grand Prix. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.