Lean condition

[bigwilly1267]

I have a 2008 Audi S5. Have two codes reading lean bank 1 and lean bank two. Where should I start to check for issues? Also the EPC light comes on periodically


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[mikeA602]

epc can be the throttle pedal, throttle body, traction control, or the cruise control.

[Sirphiladelphia]

Same. Exhaust leak or post cat sensors. Rarely pre cat sensor. But can be pre cat as well. The air to gas ratio is off due to bad sensors which reads lean or rich in bank 1 or 2 or 1 and 2.

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[bigwilly1267]

I have heard of some guys turning off the post cat sensors when they get they're cars tuned and have an after market exhaust. Is this a viable option?


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[Sirphiladelphia]

If that is a option please let me know so i can do it to my car lol im going to start a research on that ill let you know if i find any information

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[bigwilly1267]

My car has issues starting after I fill up. I have to push the gas to the floor in order for it to start. Does anyone have any ideas?


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