BANK 1 AND BANK 2

  • Tiny
  • janet26
  • 2004 Cadillac Deville
  • 98,000 miles

What does this mean bank 1 bank 2 system to lean

Monday, April 15th, 2013 AT 6:05 AM

1 Answer

  • Tiny
  • caradiodoc
  • Expert
  • 25,300 posts

Bank 1 and bank 2 refer to the two sides of a V-6 and V-8 engine. There is too much unburned oxygen in the exhaust. Common causes are a vacuum leak in the fresh air intake system or a misfiring cylinder, typically due to a bad spark plug. Whatever the cause, it's affecting both sides or there is a problem on each side.

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Monday, April 15th, 2013 AT 11:18 AM

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