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Junior · 06-13-2018, 06:50 AM

Got a CEL yesterday and the associated codes were P015B & P015D (O2 Sensor Delayed Response - Lean to Rich) In my research, I noticed a lot of people getting this code after installing headers. I however have stock headers. I've only installed a CAI intake and axle back muffler deletes, though over 2 years ago. Only have about 40k miles, so it's hard to imagine a sensor going bad, but I'm leaning towards that direction. Any other thoughts? Was told to run seafoam through the gas tank, but I don't see the relevance. I'm guessing this would not be covered under powertrain warranty, so I'm looking to do as much DIY as I can...

06-13-2018, 06:50 AM	#1
Junior Drives: 2014 2SS/RS A6 AGM Join Date: Apr 2010 Location: Maryland Posts: 526	P015B & P015D Codes w/ Stock Headers Got a CEL yesterday and the associated codes were P015B & P015D (O2 Sensor Delayed Response - Lean to Rich) In my research, I noticed a lot of people getting this code after installing headers. I however have stock headers. I've only installed a CAI intake and axle back muffler deletes, though over 2 years ago. Only have about 40k miles, so it's hard to imagine a sensor going bad, but I'm leaning towards that direction. Any other thoughts? Was told to run seafoam through the gas tank, but I don't see the relevance. I'm guessing this would not be covered under powertrain warranty, so I'm looking to do as much DIY as I can...