Bank 1 and bank 2

Tiny
JANET26
  • MEMBER
  • 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 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,864 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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