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Replaced ignition coils and spark plugs. Now getting P0201, P0203, P0205 codes

2.5K views 8 replies 6 participants last post by  m.machugh  
My thought on the matter is "Never fix something that isn't broke." You stated "as part of routine maintenance" nothing you per did was routine. Switch to TOP TIER fuel and only do injector cleaning if there is a problem. TOP TIER - High-quality Fuel Performance Standard - TOP TIER™ (toptiergas.com) Hyundia recommends top tier fuel and it is not available ad a detergent to the gas tank at each oil change.
I always add a 50 mL bottle of Liqui Moly fuel system cleaner after each oil change. I only use TOP TIER 100% gas from Phillips 66.