bank 1 and bank 2

2004 CADILLAC DEVILLE
98,000 MILES
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JANET26
  • MEMBER
  • 6 POSTS
what does this mean bank 1 bank 2 system to lean
Apr 15, 2013 at 6:05 AM
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CARADIODOC
  • ✓ASE Certified Mechanic
  • 34,321 POSTS
  • ASE Certified Mechanic
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.
Apr 15, 2013 at 11:18 AM
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