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by frosty0910
Mon Jan 01, 2024 4:55 pm
Forum: MK8 and MK9 (6R/6C) Polo (inc GTI) - Years 2009-2017
Topic: Backfiring with Rich Exhaust Gas Smell
Replies: 0
Views: 895

Backfiring with Rich Exhaust Gas Smell

Hi all,

I own a 2014 Polo 6R GTI and I'm facing a problem where the car backfires and pops during deceleration, accompanied by a rich-smelling exhaust. I'm dealing with an engine fault code P2178, which reads "System too rich off idle bank 1." So far, I've replaced the MAP sensor and the pre-cat ...

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