1. Home
  2. Advice
  3. Tags
  4. P0491

Showing articles & questions for topic
P0491

Related articles

P0491 OBD-II Trouble Code: Secondary Air Injection System Insufficient Flow Bank 1
P0491 code means there is a problem on the side of the engine which contains cylinder #1 due to a bad air inlet, faulty wires, relay, pump, or fuse.

Related questions

Question
Two mechanics have not been able to repair misfire.
Hi there. Check the intake for a possible vacuum leak around the cylinder 4. If there is no vacuum leak around the cylinder number 4, then there could be a burned valve. Check the compression on all of the cylinders...

Need a mechanic?

Our certified mobile mechanics make house calls in over 700 U.S. cities. Fast, free online quotes for your car repair.

Get a quote

Post a question and get free advice from our certified mechanics.


Ask a question